Office Chair Safety Popularization

When it comes to office chair safety, it is crucial to pay attention to the risks associated with gas springs and potential component failures, and to follow scientific guidelines for selection and use.

I. Core Risks of Gas Springs

The gas spring is the core component responsible for the height adjustment function of an office chair. Essentially, it is a miniature high-pressure container that uses internal gas to push a piston for lifting and lowering. Legitimate products are filled with inert nitrogen gas, which can withstand thousands of kilograms of pressure, but inferior products may substitute it with compressed air. Oxygen can erode the metal inner walls, causing the steel to become brittle. Daily friction-generated heat or exposure to sunlight can further increase internal pressure. If there are tiny cracks or sudden impacts from sitting forcefully, an explosion may occur. For example, in 2013, a woman surnamed Liu in Fujian suffered an explosion of a gas spring, resulting in a steel tube about 2 centimeters in diameter piercing her lower body. Multiple metal fragments were removed from her abdomen, and metal residue remained in her intestines. There have also been cases abroad where users died from excessive blood loss due to explosions. Over the past few decades, more than 40 similar incidents have occurred in China, ranging from minor injuries requiring bed rest to life-threatening situations.

II. Safety Hazards of Other Components

In addition to gas springs, components such as the backrest and bolts of office chairs may also pose failure risks. Most recall incidents in the market are due to issues such as backrest breakage and bolt failure, leading to falls and injuries for users, with a cumulative total of 19 reported injury cases. For example, if the connection point of the backrest is not firmly welded or the material strength is insufficient, it may suddenly break when leaning back. Loose or improperly sized bolts may cause the entire chair to wobble or even topple over.

III. Safety Use and Selection Recommendations

1. When selecting:
   • Look for safety certifications and ensure that the gas spring has legitimate marks (such as SGS or TUV certification). Avoid purchasing products without such marks.
   • Users weighing over 80 kilograms should choose models with more than 5 adjustment levels to ensure sufficient support.
2. During use:
   • Avoid violent operations (such as sitting forcefully or spinning rapidly) or unauthorized disassembly of the gas spring.
   • If the chair makes hissing sounds, wobbles unsteadily, or experiences stuck height adjustments, stop using it immediately and replace it.
   • When sitting for long periods, get up and move around every 5 minutes (such as getting water or stretching). Limit total daily sitting time to no more than 6 hours to relieve lumbar pressure.
3. Seating posture adjustment:
   • The seat height should allow your feet to rest flat on the ground, avoiding悬空 (hanging in the air) or tiptoeing. The seat depth should maintain a fist-sized distance behind the knees to prevent obstruction of blood circulation in the legs.