315 Office Chair Explosion

The issue of 315 office chair explosions primarily involves safety risks caused by component defects in pneumatic lift swivel chairs, with the root cause being the substandard quality of the pneumatic rods (gas springs).

1. Causes of Explosion
   The quality defects of the pneumatic rods are the core诱因 (contributing factors), specifically manifested as:

• Structural Defects: The tube walls of the pneumatic rods are too thin to withstand the internal high-pressure gas or the stress generated by frequent lifting and lowering, increasing the risk of rupture.
• Gas Issues: The purity of inert gases (such as nitrogen) is insufficient or replaced by compressed air, reducing gas stability and potentially triggering violent reactions under extreme conditions.
• Improper Use: Frequent adjustment of the seat height causes a sudden increase in the internal temperature of the pneumatic rod, accelerating material aging or gas expansion, further increasing the probability of explosion.

2. Typical Cases

• In 2009, a 14-year-old boy in Jiaozhou, Shandong, died after a top rod pierced his body while adjusting a pneumatic chair, exposing the issue of insufficient structural strength of the pneumatic rod.
• In 2017, an office chair explosion in Anhui resulted in damage to a computer case, with the cause attributed to substandard gas purity in the pneumatic rod.

3. Preventive Measures

• Purchase Genuine Products: Prioritize office chairs priced above 200 yuan that have passed national safety certifications, avoiding low-priced and inferior products.
• Inspect Key Components:
  • Test the smoothness of the pneumatic rod's lifting and lowering, ensuring no stuttering or abnormal noises;
  • Confirm that a blast-proof steel plate with a thickness of ≥2 millimeters is installed between the seat cushion and the pneumatic rod, effectively blocking fragment splatter.
• Standardize Usage Habits: Avoid frequent adjustment of the seat height to reduce temperature fluctuations inside the pneumatic rod; regularly inspect the appearance of the pneumatic rod and immediately discontinue use if cracks or deformations are found.

4. Regulatory Background
   According to the sampling results of the State Administration for Market Regulation, the failure rate of office chairs reached 23.3% in 2020, with 17 batches being swivel chairs. The main issues were concentrated on the substandard high- and low-temperature resistance of the pneumatic rods and the lack of blast-proof steel plates. Some companies, to reduce costs, used inferior pneumatic rods or omitted blast-proof devices, significantly increasing the risk of accidents under extreme conditions.