Office Chair Explosion

The explosion of office chairs, especially pneumatic lifting chairs, can have serious consequences and requires high attention and preventive measures.

There are three main reasons for the explosion of pneumatic lifting chairs: First, insufficient nitrogen purity. Regular products should be filled with high-purity inert nitrogen, while inferior products may be filled with high-pressure air (containing oxygen). Under high-temperature or frequent friction conditions, oxygen may cause combustion or a significant increase in internal pressure, ultimately leading to an explosion. Second, poor material or insufficient thickness of the cylinder wall. The wall thickness of a safe pneumatic rod should be more than 2.0 millimeters. Inferior products often use thin-walled steel pipes to save costs, resulting in insufficient load-bearing capacity and easy rupture under pressure changes. Third, loose sealing at the closure. Failure of the sealing structure can lead to gas leakage or the seepage of internal lubricating oil, disrupting the pressure balance and causing an explosion.

The consequences of an explosion are extremely serious, with high-speed flying fragments potentially piercing the seat cushion and entering the human body. For example, in 2009, a 14-year-old boy in Jiaozhou, Shandong, died of respiratory failure due to a pneumatic rod inserted into his buttocks; in 2007, Mr. Wu in Yantai was shot into the abdomen with a 16-centimeter-long steel bar, causing multiple serious injuries.

Preventive measures should be taken from three aspects: selection, inspection, and use: Proper selection: Give priority to products from regular manufacturers, pay attention to the cylinder manufacturer and steel stamp markings, and replacement parts should have international safety certifications such as SGS and TÜV. Regular inspection: Judge safety through a four-step method:

• Feel, press, and listen: A normal pneumatic rod should have a smooth buffering feel. If it feels stiff, gets stuck, or is accompanied by a hissing air leakage sound, it may be malfunctioning.
• Invert and check for oil stains: Observe whether the sealing ring is damaged and check for dark oil stains (a clear sign of hydraulic oil leakage).
• Check certifications and standards: Confirm that the product complies with the requirements for pneumatic rods in GB/T 2280-2016 'Office Chairs'.
• Confirm the presence of an explosion-proof steel plate: A steel plate 2-4 millimeters thick should be installed directly below the seat surface to block accidentally pierced parts. Safe use: Avoid repeated lifting, sliding, or sitting down forcefully to prevent uneven force on the pneumatic rod; non-professionals should not disassemble the cylinder and keep it away from high-temperature heat sources (such as stoves and ovens).