Office Chair Level 4

The Level 4 gas spring for office chairs is the highest safety level classified according to international standards, offering the strongest safety and the longest service life. Its core advantages are reflected in the following aspects:

1. Structural Strength and Material Process
The tube wall and inner core wall thickness of the Level 4 gas spring are significantly greater than those of the Level 3 gas spring, enhancing overall structural strength through a thickened design. This physical reinforcement enables it to withstand more frequent lifting and lowering operations and sustained pressure from heavier weights, making it particularly suitable for scenarios requiring long-term high-intensity use. For example, in public places or for users with heavier weights, the stability advantage of the Level 4 gas spring is more prominent.

2. Gas Purity and Operational Stability
The nitrogen gas filled inside the Level 4 gas spring has higher purity, effectively reducing the risk of corrosion to seals and pistons caused by gas impurities. At the same time, high-purity nitrogen is less affected by temperature changes, avoiding pressure fluctuations or seal failures due to thermal expansion and contraction. This characteristic enables it to maintain stable performance in extreme environments or during long-term use, reducing safety hazards caused by gas issues.

3. Testing Standards and Safety Certifications
The Level 4 gas spring must pass stringent international testing standards:

• Lifting Cycle Test: It must complete at least 50,000 fault-free lifting cycles to simulate long-term high-frequency use scenarios;
• Pressure Test: It must withstand 120,000 high-pressure tests without leakage, ensuring sealability under extreme pressure;
• Explosion Risk Control: After passing the above tests, its explosion risk is controlled at an extremely low level, far lower than that of the Level 3 gas spring.
  Regular manufacturers producing Level 4 gas springs will engrave the “Class 4” grade mark and international certification marks such as SGS, TUV, and BIFMA on them, which are direct proofs of their safety.

4. Applicable Scenarios and User Groups
The Level 4 gas spring is designed for the following scenarios:

• High-frequency lifting scenarios: Such as conference rooms and training rooms where seat height adjustments are frequently required;
• Heavy-weight bearing scenarios: Supports long-term use by users weighing over 100kg;
• Safety-sensitive scenarios: Such as medical institutions and laboratories where equipment stability requirements are extremely high.
  For ordinary household users with lighter weights and lower usage frequencies, the Level 3 gas spring can meet their needs; however, for consumers with extreme requirements for safety and durability, the Level 4 gas spring is a better choice.