Office Chair Gas Components

The main components related to the gas in office chairs are gas rods (pneumatic rods) and gas springs, which are the core components enabling functions such as height adjustment in office chairs. Here is a detailed introduction:

Gas Rods (Pneumatic Rods)

• Grade Classification: According to international standards, pneumatic rods are divided into four grades, with higher numbers indicating greater safety. Grade 1 is basically obsolete; Grade 2 is suitable for entry-level or temporary use, with a load-bearing capacity of approximately 80 - 100 kg; Grade 3 is the mainstream in the market, with a load-bearing capacity of up to 100 - 150 kg, suitable for most office scenarios; Grade 4 offers the highest safety and is often referred to as 'explosion-proof gas rods', used in high-end office chairs or scenarios with stringent load-bearing and safety requirements.
• Working Principle: Pneumatic rods are filled with high-pressure, high-purity nitrogen gas inside. They operate by utilizing the pressure difference generated by the different cross-sectional areas at both ends of the piston. When a person sits down, the internal valve opens, and the lifting shaft descends; when standing up, under the pressure of the nitrogen gas, the lifting shaft rises, enabling stepless height adjustment.
• Safety Issues: Poor-quality pneumatic rods may cause explosions, with causes including thin tube walls, insufficient purity of the inert gas or replacement with compressed air, and a sudden increase in temperature due to frequent lifting and lowering.
• Purchase Recommendations: Choose products from reputable manufacturers, check the smoothness of lifting and lowering, and ensure that a blast-proof steel plate with a thickness of ≥ 2 mm is installed between the seat cushion and the pneumatic rod. Look for clear safety certification marks (such as SGS, TUV) and grade stamps on the gas rod.

Gas Springs

• Impact on Office Chairs: Gas springs are responsible for lifting, rotating, and reclining, directly determining the sitting experience. Poor-quality gas springs can cause the chair to 'collapse soon after sitting' or 'slip down in height shortly after adjustment'.
• Characteristics of High-Quality Gas Springs: They use thickened seamless steel tubes and precisely ground piston rods, filled with high-purity nitrogen gas inside, and are equipped with a double-layer oil seal design. This ensures that the seat surface remains stable at the set height without 'slow leakage' sinking.
• Impact on Health: Chairs supported by high-quality gas springs allow the body's muscles and joints to truly relax, improving concentration; whereas chairs with insufficient support can easily cause chronic lower back pain and scoliosis.
• Identification Methods: Raise the chair to its highest position, sit steadily, and observe for any visible sinking within 5 seconds; repeatedly lift and lower it 10 times to feel if the process is smooth without jamming; check if there are stamp marks on the gas spring rod body - international safety certifications and grade markings.