In bearing procurement, confusion between 61908 and 6908 is extremely common. A customer sends a replacement request for 6908. The supplier quotes 61908. The maintenance team checks both numbers and wonders: are these different bearings? Will they fit?

 

We deal with this question almost weekly at Welink. So here's a straight answer based on years of supplying these bearings to industries ranging from medical equipment to industrial automation.

 

 

61908 and 6908 Are the Same Bearing

 

The 61908 bearing and the 6908 bearing are identical in every physical aspect. Same dimensions. Same load ratings. Same applications.

 

The only difference? Naming convention.

● 61908 follows the current ISO dimension series. This is the standard used by all major manufacturers today, SKF, NSK, FAG, and Welink.

● 6908 is the old designation. You'll still find it on legacy equipment drawings, older inventory systems, and in some Asian markets. Some old catalogs also list it as 1000908.

 

Think of it like updating a part number in an engineering system. The component itself doesn't change. Just the label.

 

Technical Specifications (Identical for Both)

 

Because they're the same bearing, the specs don't change. Here are the standard dimensions for a 61908/6908 deep groove ball bearing.

Specification	Value
Bore Diameter (d)	40 mm
Outside Diameter (D)	62 mm
Width (B)	12 mm
Dynamic Load Rating (Cr)	13.7 – 15.2 kN (manufacturer-dependent)
Static Load Rating (C0r)	9.9 – 10.0 kN
Limiting Speed (Grease)	~10,000 – 11,000 rpm
Weight	~0.112 – 0.115 kg

 

Note: Load ratings vary slightly between manufacturers based on material choices and internal design optimizations. But the mounting dimensions, 40mm bore, 62mm OD, 12mm width, are fixed by ISO standards.

 

Real-World Context: Why Two Numbers Still Exist

 

If they're the same, why do both numbers keep appearing?

 

In our experience working with customers across different industries:

● Older machinery (especially from the 1980s-90s) often has "6908" printed on original part lists.

● Newer designs and global suppliers standardized to "61908" around the 2000s.

● Some regions still use the old system internally, even when sourcing new bearings.

 

We regularly help customers translate between the two. A recent example: a client maintaining 20-year-old textile equipment sent us a drawing marked "6908-2RS." We supplied our 61908-2RS. Exact fit. No issues.

 

The Suffixes Matter More Than the Base Number

 

The real technical distinction isn't between 61908 and 6908. It's in the suffix.

Suffix	Meaning	Typical Application
2RS	Two rubber contact seals	Electric motors, washing machines, power tools, anywhere contamination protection is needed
ZZ	Two metal shields	Electric motors, washing machines, power tools, anywhere contamination protection is needed
C3	Larger internal clearance	Automotive alternators, gearboxes, fans, good debris protection, lower friction than seals
Open	No shields or seals	High-speed spindles, large motors, applications with significant temperature rise

 

So a 61908-2RS and a 6908-2RS are identical. A 61908-2RS and a 61908-ZZ are physically the same size but different in sealing.

 

How to Order Correctly

 

If you're sourcing bearings and want to avoid confusion:

① Always specify the 40×62×12 dimensions in your inquiry. This overrides any naming ambiguity.

② Use the full designation including suffix. For example, "61908-2RS" or "6908-2RS" tells the supplier exactly what you need.

③ If you're designing new equipment, use 61908 as the base number. It's the current global standard and will make future replacements simpler.

 

Common Questions Customers Ask

 

① Is a 6908 bearing the same as a 61908?

Yes. They share identical dimensions: 40mm bore, 62mm OD, 12mm width.

② Can I replace a 6908 with a 61908?

Absolutely. They are interchangeable. Just match the suffix (2RS, ZZ, etc.) to your application.

③ Why do some suppliers list both numbers?

To help customers who search using either the old or new designation. It's a service to avoid lost sales due to naming differences.

④ Is the 61908 considered a thin-section bearing?

Yes. The 61900 series is part of ISO dimension series 19, which features a relatively thin cross-section for the bore size. For comparison, a 6808 (40×52×7) is even thinner, while a 6308 (40×90×23) is much heavier.

⑤ What tolerance classes are available?

Standard deep groove ball bearings like the 61908 are typically available in P0 (normal) and P6 (higher precision) . For most industrial applications, P0 is sufficient. High-speed spindles may require P5 or higher, which we can supply on request.

 

Technical Specifications Summary

 

For engineers who need the numbers:

Parameter	61908 / 6908
Bore (d)	40 mm
Outside Diameter (D)	62 mm
Width (B)	12 mm
Chamfer (r min)	0.6 mm
Dynamic Load (Cr)	~14,000 N (typical)
Static Load (C0r)	~10,000 N
Fatigue Load Limit	~420 N
Reference Speed (grease)	11,000 rpm
Mass	0.112 kg

(Data based on Welink standard product. Other brands may vary slightly.)

 

Need Technical Support?

 

Selecting the right bearing isn't just about numbers. It's about fit, seal type, internal clearance, and application conditions.

 

If you're unsure whether a 61908-2RS suits your motor repair, or need C3 clearance for a high-temperature environment, our engineering team can help. We supply bearings for medical devices, automotive components, industrial gearboxes, and more, with full OEM customization available.

 

 

For specifications or to discuss your application, contact our engineering team directly.

 

If you work in the mechanical industry or even just do some DIY projects occasionally, you have surely used this. It is an unremarkable but crucial player in the field of motion control. It can be found in your skateboard wheels, the drum of a washing machine, and the gearbox of the electric vehicle that everyone is talking about.

 

So, what is the most popular type of ball bearing on the market? Without a doubt, the answer is single row deep groove ball bearing.

 

 

This specific style accounts for 44% of the global ball bearing market. This is not just because they are cheap, in fact they do have cost advantages. This is because for mechanical designers, they are the ultimate white spot for achieving freedom. 

 

Imagine such a component, it can withstand radial loads (for example, when a heavy object presses against the shaft), and at the same time can also withstand axial loads (the thrust in the front and back directions). This is a brief overview of the deep groove ball bearing.

 

When we examine the data from production sites and the latest industry reports, series such as 60/62/63, including thin section designs 67/68/69, are the real workhorses. These products are widely used in electric motors, automobiles, household appliances, wellness equipment, and handheld tools.

 

 

At Welink Bearing, we specialize in these very series. With three modern factories covering over 20000㎡and more than 200 automated production lines, we produce deep groove ball bearings in the range of ID 2–50mm and OD 5–100mm. Whether you need the compact 68/69 thin section series for space-constrained applications, the versatile 60 series for small motors, or the heavy-duty 62/63 series for industrial gearboxes, we have them all.

 

During our many years of export experience, we have found that the popularity of engineering products depends on their predictability. Deep groove bearings are a product with predictability. They are flexible and do not panic. No matter if the load comes from the left or the right, they can adapt to the changes. In terms of speed, due to the point contact of the balls, the friction is smaller. These bearings can operate at high speeds without overheating. They run quietly, and in applications such as medical equipment or food processing, noise is the enemy. Deep groove bearings are meticulously designed to run smoothly and quietly.

 

Just because something is standard does not mean it is dull and uninteresting. Deep groove ball bearings are constantly evolving. Let's take a look at the current measures of large manufacturers like NSK. They recently launched a new type of deep groove ball bearing specifically designed for the drive unit of electric vehicles, which is 51% lighter than the previous models. 

 

The automotive industry urgently needs to reduce weight to increase battery range. This conveys a key message to us: deep groove ball bearings not only survive but are also adapting to future developments.

 

 

Welink Bearing keeps pace with these trends. Our OEM/ODM service allows us to customize bearings to meet specific requirements, including precision grades P0, P6, P5, and P4 upon request. With certifications like ISO 9001:2015, ROHS, and REACH, we ensure that every bearing we ship meets international standards.

 

If you are purchasing electric motors, general industrial machinery, or automotive components, then you are likely already using deep groove ball bearings. The question is not whether you need them, but which model you should choose.

 

 

At Welink Bearing, we are passionate and dedicated to these small metal rings. Whether you need the standard chrome steel version (AISI 52100) for the gearbox or the stainless steel version (AISI 440C) for food-grade applications to prevent the occurrence of corrosion, we will help you understand the relevant specification requirements. And with our three strategic factory locations (Ningbo, Ningde, and Anhui) and export head office in Xiamen, we ensure fast delivery and reliable supply. Contact us today, we love talking about bearings as much as we love making them.

In the textile industry, whether it's outdoor tents, marine workwear, automotive interior fabrics, or industrial filter cloths, many textiles must endure prolonged exposure to corrosive environments like salty humid atmospheres and marine moisture. Prolonged exposure to salt spray can cause textiles to fade, lose strength, experience coating peeling, and even compromise functionality and lifespan. Salt spray testing serves as the core assessment method for evaluating the corrosion resistance of such textiles and ensuring product quality.

I. What is Salt Spray Testing?

Salt spray testing is fundamentally an accelerated, artificial method for simulating corrosive environments. Using a salt spray tester (salt spray chamber), a controlled salt mist environment is created. Textile samples are placed within this chamber to mimic the erosion process caused by natural salt sprays (such as marine atmospheres or industrial salt-laden dust), thereby rapidly evaluating the corrosion resistance of textiles, their accessories, and coatings.

Compared to natural corrosion testing that can take 1 to several years, salt spray testing accelerates the process by increasing salt solution concentration (typically several to dozens of times higher than natural environments), and precisely controlling parameters like temperature and humidity. This reduces testing cycles to hours or days, efficiently verifying product corrosion resistance while providing reliable data support for textile R&D, quality control, and market access. It addresses the pain points of natural corrosion testing—time-consuming, inefficient, and environmentally uncontrollable.

Tailored to textile industry applications, salt spray testing primarily simulates two core scenarios: First, marine environments, targeting textiles used in coastal regions (e.g., fishing vessels, nets, coastal outdoor apparel) by replicating erosion from high-salinity, high-humidity moisture. Second, industrial environments, simulating the degradation of textiles exposed to corrosive media like salt-laden dust and acidic/alkaline vapors in industrial fabrics (e.g., filter cloths, conveyor belts). This covers various textile materials and products including cotton, polyester, nylon, and coated fabrics.

II. How Does Salt Spray Corrode Textiles?

To grasp the significance of salt spray testing, one must first understand its corrosion mechanism—salt spray does not directly “corrode” fibers but instead degrades textile structure, coatings, and functionality through multiple interactions. This process manifests across three levels, particularly evident in textiles containing metallic accessories or coatings:

1. Indirect corrosion at the fiber level: The primary corrosive agent in salt spray is chloride ions. Their low hydration energy allows easy adsorption onto textile surfaces, penetrating into fiber interiors or interstitial spaces. For natural fibers (e.g., cotton), chloride ions disrupt hydrogen bond structures, causing fiber brittleness and fracture. For synthetic fibers (e.g., polyester, nylon), prolonged salt spray immersion accelerates fiber hydrolysis, reducing tensile and tear strength, and may even cause fiber aging and yellowing.

2. Direct corrosion of accessories and coatings: Commonly used metal accessories (e.g., zippers, buttons, hooks) and coatings (e.g., PU, PVC) on textiles are primary targets for salt spray corrosion. Chloride ions penetrate coatings, disrupting the protective oxide layer on metal surfaces. This creates a micro-battery system involving “low-potential metal—electrolyte solution—high-potential impurities,” leading to rusting of metal accessories, coating blistering, and peeling. Consequently, the overall appearance and durability of textiles are compromised. Simultaneously, acidic salt spray accelerates the separation of coatings from fiber substrates, causing loss of protective functionality.

3. Functional Degradation: Salt residues in the mist clog textile fiber pores, diminishing core functions like breathability and water resistance. For outdoor protective textiles and medical textiles, corrosion may also compromise antimicrobial and safety properties, rendering them unsuitable for intended use.

III. Four Key Steps in Salt Spray Testing

Salt spray testing in the textile industry must adhere to strict standards and procedures to ensure accurate and repeatable results, tailored to the diverse usage scenarios of different textiles. The core process comprises four steps, relying entirely on specialized salt spray testing equipment for precise parameter control:

1. Sample Preparation: Cut standard-sized samples from the textile to be tested (ensuring coverage of critical areas such as fibers, accessories, and coatings). Pre-clean the sample surface to remove oil, dust, and other impurities that could affect corrosion effectiveness. For coated fabrics or textiles with metallic accessories, ensure critical areas are uniformly exposed to salt spray without obstruction or overlap during sample placement. Document sample identification and initial conditions (e.g., appearance, weight, strength).

2. Test Environment Setup: Configure core parameters on the salt spray tester based on the textile's application scenario and relevant standards, as these are critical factors influencing results. Common parameters include: salt solution concentration (typically 5% sodium chloride solution simulating natural salt spray; adjustable for specialized scenarios), pH value (neutral salt spray: 6.5–7.2; acidic salt spray: 3.1–3.3; alkaline salt spray: 8.5–9.5), test temperature (neutral salt spray: 35°C ± 2°C, copper-accelerated acetic acid salt spray: 50°C ± 2°C), salt spray deposition rate (1.5 ml/h ± 0.5 ml/h), and test duration (ranging from 24 hours to hundreds of hours, with outdoor textile tests typically longer). Maintain relative humidity ≥95% inside the chamber to ensure continuous electrolyte film formation on sample surfaces.

3. Sample Placement and Test Operation: Secure prepared samples on the test chamber's sample rack at a 30° angle to the vertical (ensuring uniform salt spray coverage). Close the chamber and activate the instrument to commence testing. During testing, the instrument must maintain continuous, stable spraying with constant parameters, avoiding fluctuations in temperature or salt spray concentration. Assign dedicated personnel to monitor the equipment, conducting regular checks to ensure compliance with standards and prevent invalid data.

4. Post-Test Handling and Observation: After testing concludes, remove the samples and gently rinse residual salt from the surface with clean water (avoid vigorous wiping that could damage the samples). Place them in a drying oven until constant weight is achieved. Compare the samples' pre- and post-test conditions, record corrosion-related data to provide a basis for subsequent corrosion resistance evaluation, and compile the test data into a comprehensive inspection report.

IV. How Does Salt Spray Testing Measure Corrosion Resistance?

Salt spray testing evaluates a textile's corrosion resistance by comparing sample changes before and after testing. Combining qualitative observation with quantitative analysis, it provides a comprehensive assessment across multiple dimensions. Evaluation priorities vary slightly for different textiles and can be categorized into five dimensions:

(1) Qualitative Assessment: Visual Inspection of Corrosion Appearance

This is the most fundamental and direct assessment method, primarily observing corrosion phenomena on the sample surface. Industry standards are used to determine corrosion resistance grades, focusing on three key aspects:

1. Fibers and Fabrics: Check for yellowing, brittleness, breakage, fading, pilling, or fuzzing. No significant changes indicate excellent corrosion resistance.

2. Metal accessories: Check for rust spots, rust stains, or oxidation discoloration. Absence of any corrosion marks is optimal; minor rust spots require standard-based qualification assessment.

3. Coating-to-accessory bonding: Inspect for coating blistering, peeling, or cracking. Verify secure attachment of accessories to fabric (e.g., zipper jamming, button detachment). Complete coating integrity and firm connections indicate corrosion resistance compliance.

(2) Quantitative Assessment: Precise Corrosion Severity Measurement

Qualitative observation cannot accurately distinguish subtle differences. For mid-to-high-end textiles (e.g., premium outdoor apparel, aerospace textiles, military textiles), quantitative testing using specialized instruments is required. This assessment centers on six key metrics, which also serve as the core evaluation criteria for textile salt spray testing:

1. Weight Change Rate: Weigh samples before and after testing using precision electronic balances to calculate percentage weight gain/loss. Weight gain typically indicates corrosion product adhesion, while loss suggests fiber or coating corrosion. A lower change rate indicates superior corrosion resistance.

2. Strength Retention Rate: Measured by testing tensile strength and tear strength before and after exposure using a tensile testing machine. The retention rate indicates the proportion of strength preserved—higher retention signifies minimal fiber corrosion and superior corrosion resistance.

3. Color Difference Change: Measure the ΔE value (color difference) of the textile before and after testing using a color difference meter to evaluate fading and discoloration levels. A lower ΔE value indicates better color stability. Decorative textiles and apparel fabrics typically require ΔE ≤ 2.0, meaning no noticeable color difference to the naked eye.

4. Coating Adhesion: For coated textiles, determine the bond strength between coating and substrate using the cross-hatch adhesion test or tensile adhesion test to evaluate adhesion grades. This prevents coating peeling, with Grade 1 adhesion (no peeling) being optimal.

5. Corrosion Area Ratio: Using a 10-level rating system, assess the grade based on the percentage of surface defects (corrosion, blistering, fading) on the sample. Higher grades indicate better corrosion resistance—Grade 10 has no defects, while Grade 1 has over 25% corrosion area.

6. Microstructure and Functionality: Observe corrosion morphology (e.g., cracks, blistering) on textile surfaces using optical or scanning electron microscopes to analyze fiber structural changes. Simultaneously evaluate functional indicators like waterproofing, breathability, and antimicrobial properties to ensure post-corrosion performance meets usage requirements—a core assessment focus for outdoor and medical textiles.

V. Four Major Types of Salt Spray Tests

1. Neutral Salt Spray Test (NSS): The most commonly used type, simulating ordinary marine atmospheres and humid, saline environments. The salt solution has a pH of 6.5-7.2 and a temperature of 35°C ± 2°C. A 24-hour test is equivalent to approximately one year of corrosion in natural environments. Suitable for general outdoor textiles, home textiles, cotton-polyester blended fabrics, etc., it is the most widely applied basic test type in the textile industry.

2. Acetic Acid Salt Spray Test (AASS): An acidic environment test with a salt solution pH of 3.1–3.3 and a temperature of 35°C ± 2°C. A 24-hour test is equivalent to approximately 3 years of natural corrosion. Suitable for textiles containing copper-nickel-chromium accessories or aluminum anodized films (e.g., high-end garment zippers, bathroom textiles). Its corrosion efficiency is 2–3 times that of neutral salt spray.

3. Copper-Accelerated Acetic Acid Salt Spray Test (CASS): High-intensity corrosion test. Copper chloride is added to the acidic salt spray, with temperature increased to 50°C ± 2°C. A 24-hour test corresponds to approximately 8 years of natural environmental corrosion. Suitable for high-end textiles and precision accessories (e.g., aerospace textiles, premium hardware accessories). Corrosion efficiency is 5-8 times that of neutral salt spray, enabling rapid differentiation of product quality grades.

4. Alternating Salt Spray Test: Simulates complex natural environments (salt spray, drying, humid heat cycles). 35°C salt spray exposure alternates with ambient temperature drying and humid heat phases, closely mimicking long-term outdoor use. Suitable for photovoltaic textiles, marine textiles, outdoor tents, etc.

VI. Significance of Salt Spray Testing

For textile enterprises, salt spray testing transcends mere “compliance verification.” It serves as a critical component for enhancing product competitiveness and mitigating quality risks, with its core value manifested in three key areas:

1. Identifying vulnerabilities in textiles exposed to corrosive environments (e.g., rust-prone accessories, coating peeling) through testing enables timely optimization of material selection and production processes. This prevents post-market quality issues, reducing after-sales complaints and rework costs;

2. During new product development, salt spray testing enables comparative analysis of corrosion resistance across different materials and processes. This facilitates optimization of product formulations and structures, creating more durable textiles suited for complex scenarios (e.g., high-end outdoor apparel, long-lasting industrial filter fabrics) and fostering differentiated competitive advantages.

3. Whether for domestic sales or export, many textiles (e.g., outdoor gear, automotive interior fabrics, military textiles) require salt spray test compliance reports. Passing these tests ensures regulatory compliance while precise test data provides robust support for product promotion, enhancing customer trust.

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In-Depth Analysis: Key Requirements for Stability Chambers and Selection Guide

In industries such as pharmaceuticals, biotechnology, cosmetics, and food, stability chambers are critical equipment for ensuring product quality and safety. It help scientists evaluate product stability and shelf life during long-term storage. However, selecting and maintaining a suitable stability chamber is not a simple task.

What is a Stability Chamber?

A stability chamber is specialized equipment capable of precisely controlling environmental parameters such as temperature, humidity, and light exposure. It is used to conduct stability studies as outlined in ICH (International Council for Harmonisation of Technical Requirements for Pharmaceuticals for Human Use) guidelines. 

Core Technical Requirements

1. Temperature Control Precision

• Range: Must cover ICH-standard conditions such as 2-8°C (refrigerated), 25°C/60%RH (long-term), 30°C/65%RH (intermediate), and 40°C/75%RH (accelerated).

• Accuracy: Should achieve ±0.5°C or better.

• Uniformity: Temperature variation within the chamber should not exceed ±1.0°C.

• Recovery Time: Fast temperature recovery after door opening to minimize impact on tests.

2. Humidity Control Precision

• Range: Typically requires broad control capability, e.g., 10-95% RH.

• Accuracy: Industry standard is ±1-3% RH.

• Uniformity: Variation across points should not exceed ±3% RH.

• Condensation Prevention: Design must avoid condensation on sample surfaces.

3. Light Exposure Control System

For products requiring photostability testing, the chamber should provide:

• ICH Q1B Guideline-specified light conditions: UV (320-400 nm) and visible light (400-800 nm).

• Precise control of light intensity and spectral distribution.

• Uniform light distribution to ensure consistent conditions for all samples.

4. Monitoring and Validation System

• Continuous Monitoring: Real-time recording of key parameters like temperature and humidity.

• Alarm Function: Automatic alerts (audible, visual, SMS, or email) for out-of-spec conditions.

• Data Integrity: Compliance with 21 CFR Part 11 requirements (audit trails, electronic signatures, secure access controls).

• Regular Validation: Capability for IQ (Installation Qualification), OQ (Operational Qualification), and PQ (Performance Qualification).

5. Design and Construction

• Materials: Corrosion-resistant stainless steel interior, easy to clean, contamination-free.

• Sealing: Effective door seal design to minimize environmental interference.

• Sample Capacity: Flexible, adjustable shelving systems to maximize space utilization.

• Energy Efficiency: High-efficiency, energy-saving design to reduce long-term operational costs.

Compliance with Regulatory Requirements

Stability chambers must meet a range of international standards and regulations:

1. ICH Guidelines: Q1A(R2), Q1B, Q1D, Q1E, etc.

2. GMP/GLP Standards: Good Manufacturing Practice and Good Laboratory Practice.

3. FDA 21 CFR Part 11: Electronic records and electronic signatures requirements.

4. EU GMP Annex 11: Computerized system requirements.

5. ISO 9001:2015: Quality management systems.

Conclusion

Selecting the right stability chamber is a decision that requires comprehensive consideration of technical performance, regulatory compliance, and long-term cost-effectiveness.Staying informed about these changes and regularly assessing whether your equipment meets the latest standards is a key responsibility for every laboratory manager. Labonce will accompany every clients for better goals.

In fields such as precision manufacturing, materials research, electronics, and life sciences, conducting stable and repeatable temperature and humidity environmental tests on products is crucial. Labonce TH Series Constant Temperature and Humidity Chamber—a core device designed specifically for high-standard environmental simulation testing.

Core Performance: The Perfect Balance of Precision and Range

The key advantage of the Labonce TH Series lies in its perfect integration of outstanding performance parameters and excellent stability:

• Broad Temperature Control Range: 0°C to +100°C

  • Covers a wide range of applications from room temperature to high temperature, simulating various thermal environments that products may encounter during storage, transportation, and use.

• Accurate Humidity Control Range: 20%RH to 95%RH

  • Achieves precise control across a wide humidity spectrum, easily addressing testing challenges from dry to highly humid environments, such as accelerated aging and damp heat cycling.

Why is the TH Series the Optimal Choice for Your Laboratory?

1. Precise Control, Trustworthy Data
Utilizing an advanced Balanced Temperature & Humidity Control (BTHC) system and PID intelligent algorithms, it ensures uniform and stable temperature and humidity inside the chamber. Temperature fluctuation can be as low as ±0.5°C, and humidity fluctuation ±2%RH, providing laboratory-level precision and ensuring the reliability and repeatability of every test.

2. Robust and Durable, Stable Operation
The interior is constructed from high-quality stainless steel, offering sturdiness and corrosion resistance. Core components are sourced from internationally renowned brands, combined with Labonce’s mature system integration and process technology. 

3. User-Friendly Design, Smart and Convenient

• Intuitive Touch Interface: A large color touchscreen with clear operation logic and parameter settings.

• Powerful Programming Functionality: Supports multi-segment programming, allowing flexible simulation of complex temperature and humidity change curves for automated cyclic testing.

• Remote Monitoring and Management: Optional network interface supports remote data viewing and downloading, facilitating centralized laboratory management.

4. Comprehensive Safety, Peace of Mind
Equipped with multiple safety protections: independent over-temperature protection, fan overheating protection, water shortage protection, leakage protection, and more, ensuring全方位 safety for both the testing process and the equipment itself.

Typical Application Scenarios

• Electronic Product Reliability Testing: Performance and lifespan evaluation of PCBs, components, and end devices under high/low temperature and humidity conditions.

• Materials Research: Weather resistance and moisture absorption testing for polymers, composite materials, coatings, textiles, etc.

• Pharmaceutical and Packaging Stability Testing: Simulating storage conditions of drugs in different climatic zones to evaluate stability and packaging integrity.

• Automotive Component Testing: Functional and durability validation of in-vehicle electronics, interior parts, etc., under specific temperature and humidity environments.

• Scientific Research and Quality Control: Providing standardized environmental test conditions for universities, research institutions, and enterprise quality control laboratories.

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About Labonce: We specialize in the field of environmental test equipment, committed to providing global customers with testing solutions ranging from standard to customized, through innovative technology, reliable quality, and comprehensive service. The TH Series embodies our deep understanding of precision, stability, and user needs.

For detailed technical specifications, configuration options of the Labonce TH Series, or to obtain customized solutions, please feel free to contact our technical team.

Walk-In Stability Chambers – Our Standard Offering

In the demanding worlds of pharmaceuticals, biotechnology, and medical devices, ensuring product stability and shelf life isn't just a best practice—it's a regulatory requirement. While benchtop chambers serve a vital role for small-scale testing, many R&D, quality control, and production processes demand a larger-scale solution. This is where our standard Walk-In Stability Chambers come in, offering unparalleled capacity and performance without the need for a custom-engineered project.

What is a Walk-In Stability Chamber?

A walk-in stability chamber is a large, room-sized environmental test unit designed to simulate and maintain precise conditions of temperature and humidity over extended periods. As the name suggests, they are large enough for an operator to walk into, allowing for the organized storage of large product batches, pallets, or numerous shelves of samples. Their primary purpose is to conduct ICH stability studies to determine the effects of environmental conditions on a product's efficacy, safety, and quality over time.

When Do You Need a Walk-In Chamber?

Our clients typically invest in a walk-in chamber when:

Batch Size is Large: You need to test commercial-scale batches or a high volume of samples simultaneously.

Production is Scaling Up: Your R&D is complete, and you are moving into clinical trials or full-scale production, requiring larger stability studies.

Efficiency is Key: Consolidating samples into a single, large chamber is more efficient and manageable than using multiple smaller units.

You Need to Store Packaging & Products Together: Testing final packaged products in their shipping cases is easily accommodated.

The Cornerstones of Our Standard Offering

We understand that "custom" can often mean "complex and costly." That’s why we have refined our walk-in chamber design into a robust standard offering that delivers exceptional value and reliability. Here’s what you can expect:

1. Uncompromising Performance & Uniformity

Our chambers are engineered to meet the most stringent guidelines, including ICH Q1A(R2). We guarantee precise control and tight uniformity across the entire workspace.

Temperature Range: A standard range of 20°C to 45°C, with options for extended ranges, including accelerated conditions.

Humidity Range: Standard control from 20% to 80% RH.

Uniformity: We ensure minimal deviation in temperature (±0.5°C) and humidity (±2% RH) at every point within the chamber, crucial for valid data.

2. Built to last, our chambers feature:

Cladded Panels: High-density, non-CFC polyurethane foam insulation in stainless steel or aluminum cladding ensures excellent thermal efficiency and structural integrity.
Stainless Steel Interiors: Easy-to-clean, corrosion-resistant surfaces maintain a clean testing environment.
Tight Seals: Well-sealed doors with robust locking mechanisms prevent environmental leakage.

3. While we offer a powerful standard design, we also provide key options to ensure the chamber fits your specific facility and requirements, such as:

• Various shelf configurations and materials

• Different door styles (single or double)

• Ports for data cables or sampling

• A range of validation packages (IQ/OQ/PQ)

Why Choose Our Walk-In Stability Chamber?

Our standard walk-in stability chambers represent the perfect balance of proven performance, operational efficiency, and cost-effectiveness. You get a turnkey solution that is ready for validation and built to support your critical stability testing programs for years to come.

Ready to scale your stability testing with confidence！

Contact Labonce today to discuss your project requirements and receive a detailed specification sheet for our standard walk-in stability chambers.

How many types of stability chambers are there?

Stability chambers can be categorized in numerous ways based on capacity, function, technological principle, and regulatory compliance. Here is a comprehensive classification:

1. Classification by Capacity & Design

This is the most intuitive method, directly related to lab space planning and testing throughput.

• Benchtop Stability Chambers:

  • Features: Compact size, can be placed on a laboratory workbench or counter.

  • Applications: Ideal for early-stage R&D, sample screening, academic research, or testing with small sample volumes.

• Upright Stability Chambers:

  • Features: Resemble a large refrigerator, with a small footprint that utilizes vertical space efficiently. They typically have multiple internal shelves.

  • Applications: The most common and mainstream type for pharmaceutical quality control and routine stability studies. They offer a balanced capacity and full functionality.

• Walk-in Stability Chamber:

• Features: A custom-built "room" where personnel can walk inside to store and retrieve samples.

• Applications: Used by large pharmaceutical companies and Contract Research Organizations (CROs) that need to test very large batches of samples (e.g., entire cartons or pallets of raw materials or finished products).2. Classification by Function & Testing Parameters

This is the most critical technical classification, determining whether the chamber can meet specific regulatory testing requirements.

• Constant Temperature & Humidity Chambers:

  • Features: Capable of precisely controlling and maintaining specific temperature and humidity setpoints. These are the core equipment for long-term and accelerated stability testing following ICH (International Council for Harmonisation) guidelines.

  • Applications: Simulating different global climate zones, such as 25°C ± 2°C / 60% ± 5% RH (long-term) and 40°C ± 2°C / 75% ± 5% RH (accelerated).

• Photostability Chambers:

• Features: In addition to temperature control, these are integrated with controlled light sources that provide visible and UV light exposure compliant with ICH Q1B guidelines.

• Applications: Specifically used to study the photosensitivity of pharmaceuticals and their formulations, assessing degradation under light conditions.

• Low Temperature Stability Chambers:

• Features: Precisely control temperature only, without controlling humidity.

• Applications: Used for products requiring specific storage temperatures but not strict humidity control, such as certain biologicals, reagents, or drugs stored at 2-8°C, -20°C.

2. Classification by Technological Principle

This relates to the internal heating and humidity generation systems, impacting performance, operating costs, and maintenance.

• Water-Jacketed Chambers:

  • Features: The inner chamber is surrounded by a jacket filled with deionized water. Temperature is achieved by heating or cooling this water, resulting in very uniform and stable temperature control. Advantages include fast temperature recovery, excellent uniformity, and the ability to maintain internal temperature for a longer period during a power outage.

  • Applications: Critical applications where superior temperature uniformity and stability are paramount.

• Direct-Heat / Mechatronic Chambers:

  • Features: Temperature is controlled by directly heating or cooling the air inside the chamber using electric heating elements and an efficient mechanical refrigeration system. Advantages include faster heat-up times, lower energy consumption, and no need to manage a water jacket.

  • Applications: A common design in modern chambers. The technology is now very mature and offers a cost-effective choice for many labs while maintaining precise control.

Summary

Selecting the right type of stability chamber is a comprehensive decision-making process based on:

• Testing Purpose: Is humidity control needed? Is light exposure required?

• Sample Volume: Is it for small-scale R&D or large-scale quality control?

• Space Constraints: Does the laboratory have space for an upright or walk-in unit?

• Budget and Compliance Requirements: Is it for non-critical research or for official regulatory submission?

In the actual market, the most common configuration is the Constant Temperature & Humidity Chamber, which serves as the cornerstone of stability studies in the pharmaceutical industry. Labonce is a leading stability chamber manufacturer,get more information from us.

Selecting the ideal Stability Chamber, also known as a Stability Test Chamber, is crucial for ensuring accurate testing results and maintaining compliance with industry standards. With so many options available, it’s essential to consider several key factors before making a decision. Here’s a guide to help you choose the right Stability Chamber for your business, with insights into how Labonce Stability Chambers stand out.

1. Temperature and Humidity Range

The core function of a Stability Chamber is its ability to maintain precise environmental conditions. Ensure the chamber you choose can meet your required temperature and humidity ranges. For most industries, a range of 10°C to 60°C for temperature and 20% to 95% RH for humidity is sufficient. Labonce stability chambers excel in delivering stable and uniform conditions tailored to various applications.

2. Chamber Size and Capacity

Assess your testing volume to determine the appropriate size. Smaller chambers are ideal for compact operations, while larger, walk-in models suit high-volume testing. Labonce offers a variety of sizes, from benchtop models to walk-in chambers, to fit your specific needs.
3. Compliance with Standards

In industries like pharmaceuticals, compliance with standards such as ICH Q1A is non-negotiable. Labonce Stability Test Chambers are designed to meet global regulatory requirements, ensuring reliable testing results and audit readiness.

4. Energy Efficiency

Opt for an energy-efficient chamber to reduce operational costs without compromising performance. Labonce chambers are built with energy-saving technology, making them a cost-effective choice.

5. Features and Technology

Look for advanced features such as programmable controls, real-time data logging, and remote monitoring. Labonce chambers integrate cutting-edge technology to enhance user experience and testing accuracy.

6. Reliability and Maintenance

Choose a Stability Chamber from a reputable brand known for durability and after-sales support. Labonce provides robust systems with low maintenance requirements, backed by comprehensive technical support.

Why Choose Labonce Stability Chambers?

Labonce is committed to providing high-performance Stability Test Chambers tailored to your business needs. With precise control systems, energy efficiency, and compliance with international standards, Labonce ensures reliable and efficient testing solutions.

Investing in the right Stability Chamber means better testing results and long-term operational efficiency. Trust Labonce to deliver excellence in stability testing technology.

Photostability testing is crucial in industries like pharmaceuticals, cosmetics, and chemicals, where product stability under light exposure is paramount. A high-quality photostability test chamber ensures precise and reliable results. Labonce, a leading photostability chamber manufacturer, provides state-of-the-art environmental stability test chambers designed to meet rigorous testing standards. Here’s a step-by-step guide on using a photostability test chamber for accurate results.

1. Understand the Photostability Test Chamber Specifications

Before beginning any test, it is vital to understand the specifications of your laboratory photostability chamber. Labonce chambers are designed to simulate a wide range of environmental conditions, including temperature, humidity, and light intensity, to provide a controlled environment that meets ICH Q1B guidelines. Ensure you are familiar with the chamber’s settings and capabilities.

2. Prepare Your Samples Properly

Proper sample preparation is crucial for obtaining accurate results. Ensure that all samples are placed in suitable containers that do not react with the light or environmental conditions. Arrange the samples uniformly within the photostability test chamber to ensure consistent exposure to the light source.

3. Set the Appropriate Test Parameters

Labonce photostability chambers come with advanced digital controllers to set precise environmental parameters such as temperature, humidity, and light intensity. Adjust these settings according to the specific requirements of your product testing protocol. Follow guidelines from regulatory bodies like ICH to ensure the test conditions are compliant.

4. Regular Monitoring and Documentation

Throughout the testing process, it is essential to regularly monitor the chamber’s performance and the condition of the samples. Labonce's photostability test chambers are equipped with data logging systems that facilitate real-time monitoring and automatic recording of environmental conditions. This helps in ensuring consistent results and identifying any deviations promptly.

5. Maintenance and Calibration

For consistent accuracy, regular maintenance and calibration of your photostability chamber are critical. Labonce provides comprehensive maintenance services and calibration support to ensure that your chamber remains in optimal working condition. Cleaning the chamber and checking for any wear and tear in components can help avoid unexpected issues during critical tests.

6. Analyze the Results Effectively

After completing the testing cycle, carefully analyze the collected data. Labonce's photostability chambers provide easy data export options for thorough analysis. Use this data to understand how your product behaves under different environmental conditions, which can be crucial for determining its shelf life and stability.

By following these steps, you can leverage the advanced capabilities of Labonce's environmental stability test chambers to obtain accurate and reliable photostability test results, ensuring your products meet the highest standards of quality and safety. As a trusted photostability chamber manufacturer, Labonce is committed to supporting laboratories in achieving excellence in stability testing.

A Stability Chamber, also known as a Stability Test Chamber, is a specialized piece of equipment designed to create controlled environmental conditions for testing the stability and durability of products. These chambers are essential tools in industries such as pharmaceuticals, cosmetics, food and beverage, and electronics, ensuring that products meet regulatory and quality standards.

Functions of a Stability Chamber

The primary purpose of a Stability Chamber is to simulate various environmental conditions, such as temperature and humidity, over extended periods. This allows manufacturers to observe how their products react to environmental stressors like heat, cold, moisture, and light. Stability Chambers are equipped with advanced temperature and humidity control systems to maintain precise conditions, often following international guidelines like ICH Q1A for stability testing.

Key features include:

1.Temperature Control: Ranges typically from 10°C to 60°C.
2.Humidity Control: Adjustable levels between 20% to 95% relative humidity.
3.Uniformity: Ensures consistent conditions throughout the chamber.
4.Data Logging: Real-time monitoring and recording of testing conditions.

Applications of Stability Test Chambers

1.Pharmaceuticals: Conducting stability studies to determine drug shelf life and optimal storage conditions.
2.Food & Beverage: Testing packaging and product stability under varying conditions to ensure quality.
3.Cosmetics: Assessing formulations for durability against temperature and humidity changes.
4.Electronics: Simulating environmental conditions to ensure the longevity of components.

Why Choose Labonce Stability Chambers?

Labonce offers advanced Stability Chambers tailored to meet stringent industry requirements. With state-of-the-art technology, precise control systems, and a focus on reliability, Labonce ensures your testing processes are efficient and compliant with international standards. Our products combine durability, energy efficiency, and easy operation, making them a trusted choice for stability testing across diverse industries.

Whether you're conducting drug stability studies or ensuring product quality, Labonce Stability Chambers provide unmatched performance to meet your testing needs.