Office Chair Gas Spring Stamp

The stamps on the gas springs of formal and safe office chairs should clearly indicate the grade (such as 'Class 3' or 'Class 4') and the logos of international certification bodies (such as SGS, TUV, BIFMA). These stamps serve as proof that the gas springs have passed rigorous testing and should be a key focus during the purchasing process.

Core Information of the Stamp: Grade and Certification

1. Grade Identification: The grade of a gas spring typically starts with 'Class' followed by a number (e.g., Class 3, Class 4). A higher number indicates stronger load-bearing capacity and longer service life. For example, a Class 3 gas spring can bear approximately 100-120 kilograms and is suitable for ordinary office settings, while a Class 4 gas spring can bear over 150 kilograms and is ideal for users who are heavier or need to frequently adjust the height.
2. Certification Body Logos: Logos from international authoritative certification bodies (such as SGS, TUV, BIFMA) are important indicators of the safety of gas springs. SGS is a global leader in inspection and verification, with certifications covering material safety and durability. TUV is the German Technical Inspection Association, known for its strict certification standards, especially regarding mechanical performance. BIFMA is the standard of the Business and Institutional Furniture Manufacturers Association in the United States, covering tests such as compression resistance and fatigue resistance of gas springs.

Role and Importance of the Stamp

1. Safety Assurance: The stamp serves as an 'ID card' proving that the gas spring has passed safety tests. Gas springs without grade or certification stamps may have issues such as inferior materials or manufacturing defects, posing risks of explosion or air leakage during use, which seriously threaten user safety.
2. Quality Reference: The stamp allows for a quick assessment of the quality of the gas spring. For example, a Class 4 gas spring is usually made of high-strength steel with a more precise internal sealing structure, and its lifespan is 2-3 times that of a Class 3 gas spring. A gas spring certified by BIFMA must undergo over 100,000 lifting and lowering tests, demonstrating significantly better durability than non-certified products.

Key Points to Check During Purchase

1. Location Confirmation: The stamp is generally located on the cylinder body of the gas spring (the metal part near the base). Carefully check whether the surface is clear and free of wear. Some low-priced products may have the stamp printed on non-critical parts or use light-colored ink, making it easily overlooked.
2. Information Verification: Ensure that the grade and certification logos are complete. For example, only having 'Class' without a number or having only an abbreviation of the certification body (such as 'T' instead of 'TUV') are considered non-standard and should be chosen with caution.
3. Auxiliary Verification: You can check the product number (if available) on the certification body's official website or request the merchant to provide a test report to further verify the authenticity of the stamp.

Summary: The stamp on the gas spring of an office chair is a core indicator of safety and quality. When purchasing, be sure to check the grade and certification logos, and prioritize products with Class 3/4 and SGS/TUV/BIFMA certifications to avoid potential risks.