Office Chair Boss Chair Spring

The spring part in office chairs and boss chairs usually refers to the gas spring, which is the core component for seat lifting, rotation, and reclining, directly affecting sitting experience and safety.

I. Core Features of High-Quality Gas Springs

1. Materials and Structure
   Thickened seamless steel tubes (wall thickness ≥ 2.0mm) and precisely ground piston rods are used to ensure structural strength and wear resistance. High-purity nitrogen (purity ≥ 99.99%) is filled inside, combined with a double-layer oil seal design (the seal ring is made of aging-resistant fluororubber), effectively preventing gas leakage and impurity intrusion, and avoiding chair surface sinking caused by 'slow gas leakage'.

2. Performance Testing Standards
   Pass a 24-hour fatigue test: Simulate a 75-kilogram load being lifted and lowered 100,000 times at a frequency of 6 times per minute, with a stroke reduction of no more than 5%. Calculated at 30 lifts per day, the service life can reach over 8 years, far exceeding that of ordinary products.

3. Safety Certifications and Grades
   High-quality gas spring rods must be stamped with international safety certifications (such as SGS, TÜV) and grade marks (Class 3 or Class 4). Among them, Class 4 can withstand a dynamic load of over 200 kilograms, with a service life more than three times that of ordinary products, suitable for scenarios with heavier weights or high-frequency use.

II. Defects of Ordinary Gas Springs

1. Insufficient Materials and Workmanship
   Welded tubes with a wall thickness of less than 1.5mm are used, and the internal seals are made of ordinary nitrile rubber, with a nitrogen purity of only about 90%. Such designs are prone to gas molecule leakage and seal wear.

2. Rapid Performance Degradation
   After 3 months of use, problems such as reduced stroke and decreased support force may occur, manifested as slow chair surface sinking or lifting stuttering, affecting comfort and safety.

III. Selection and Evaluation Methods

1. Static Test
   Raise the chair to its highest point, sit steadily, and observe whether the chair surface sinks within 5 seconds. If there is a significant drop, it indicates insufficient sealing of the gas spring or low nitrogen purity.

2. Dynamic Test
   Repeatedly lift and lower the chair 10 times, checking for smooth operation without stuttering. Stuttering may be caused by piston rod wear, oil seal aging, or insufficient nitrogen pressure.

3. Marking Verification
   Check whether the gas spring rod has steel stamp markings to confirm whether it has passed international safety certifications (such as SGS, TÜV) and grade marks (prioritize Class 4). Products without markings or with unclear markings may pose safety risks.