Why Do Office Chairs Break? Causes

Office chairs may break, with the main causes including fatigue failure, explosion of pneumatic lift chairs, product quality issues, design flaws, improper usage habits, and environmental impacts.

1. Fatigue Failure: Long-term repeated loading, such as daily sitting and moving, gradually fatigues the internal structure of the material. The backrest of an office chair, subjected to repeated leaning fatigue loads over time, experiences gradual wear and tear on its components, leading to the formation of micro-cracks. Eventually, this results in sudden breakage, often concentrated at the connection points between the backrest and the base, as well as in the adjustment mechanisms.
2. Explosion of Pneumatic Lift Chairs: If the quality of the pneumatic rod (gas spring) is substandard, it can become a 'time bomb'. Factors such as an excessively thin tube wall, poor sealing, insufficient purity or abnormal pressure of the inert gas, the absence of a crucial explosion-proof steel plate in the chair, long-term overloading or frequent and violent lifting, and incorrect disassembly and assembly causing component damage, can all lead to the sudden explosion of a low-quality pneumatic rod under extreme conditions. The resulting impact force can be strong enough to blow through the chair seat, causing serious injuries.
3. Product Quality Issues: Some chairs inherently pose safety hazards, with office chairs (especially swivel chairs) having a relatively high rate of product non-compliance. Common issues include failure to meet standards in structural safety and base static load capacity. To cut costs, some manufacturers use thin-walled materials, low-quality connectors, and even omit key protective components. These defects may be difficult to detect during short-term use but pose a risk of breakage over the long term.
4. Design Flaws: Overly dense screw holes and excessively thin panels (less than 1.2 centimeters) can lead to stress concentration. In particular, the 'L'-shaped hollowed-out seat design lacks support at the edges, making it prone to breakage.
5. Improper Usage Habits: Forcefully leaning back, rocking, overloading, or improperly pulling on the edges of the chair can cause instantaneous or cumulative damage to the backrest structure. Additionally, prolonged heavy pressure can cause the internal filling to lose elasticity and deform, indirectly affecting the backrest's support. Over time, screws and buckles at connection points may loosen and wear, leading to an unstable backrest.
6. Environmental Impacts: In northern regions during winter, when indoor humidity in heated rooms drops below 30%, solid wood panels are prone to shrinkage and cracking. Conversely, in southern regions during the rainy season, when humidity exceeds 70%, panels absorb moisture and expand, causing joints to burst.