Office Chair Explosion Event

The office chair explosion event mainly refers to the sudden explosion phenomenon of pneumatic lifting swivel chairs caused by component defects, which mostly occurs in low-quality pneumatic rod products.

Event Background and Mainstream Types

Pneumatic lifting swivel chairs have gradually replaced screw-type swivel chairs as mainstream office furniture since around 2000. Their core component is the pneumatic rod, which achieves lifting and lowering functions by filling with inert gases (such as nitrogen) and utilizing pressure differences. However, low-quality products pose serious safety hazards. According to the sampling inspection data of the State Administration for Market Regulation in 2020, the non-compliance rate of office chairs reached 23.3%, among which 17 batches were swivel chairs. The main problems were that the high and low temperature resistance performance of the pneumatic rods did not meet the standards and no explosion-proof steel plates were installed.

Typical Explosion Cases

• Zhoushan, Zhejiang in 2007: The first publicly reported seat explosion incident, which attracted social attention.
• Jiaozhou, Shandong in 2009: A 14-year-old boy died after a top rod of a pneumatic chair pierced into his body when adjusting the chair, exposing product design defects.
• Fujian in 2013: When Ms. Liu was sitting on a swivel chair and blowing her hair, the chair suddenly exploded. A steel pipe with a diameter of about 2 centimeters rushed out and penetrated her lower body. Several metal fragments were removed from her abdominal cavity, and there were multiple pieces of metal residue in her intestines.
• Anhui in 2017: An office chair explosion damaged a computer case, further proving the destructive power of low-quality pneumatic rods.

Explosion Cause Analysis

• Thin wall of the pneumatic rod: Unable to withstand internal pressure, it is prone to break under high temperature or external force.
• Insufficient purity of the inert gas or replacement with compressed air: The oxygen in the air will erode the inner metal wall, making the steel brittle. At the same time, the heat generated by daily lifting and lowering friction will exacerbate the increase in internal pressure.
• Frequent lifting and lowering leading to a sudden rise in temperature: Exposure to the sun in summer, sudden sitting down, or tiny internal cracks may all be诱因 (causes) of explosions.

Preventive Measure Suggestions

• Purchase regular products: Give priority to products priced above 200 yuan and avoid buying products from no-name brands.
• Check the performance of the pneumatic rod: Ensure smooth lifting and lowering without jamming, and confirm that an explosion-proof steel plate with a thickness of no less than 2 millimeters is installed between the seat cushion and the pneumatic rod.
• Standardize usage behavior: Avoid violent operations (such as sudden sitting and frequent rotation) or unauthorized disassembly of the pneumatic rod to prevent accidents caused by human-induced damage.