Office Chair Gas Lift

Description

The Gas Lift Cylinder in an office chair is the core component that supports the user's weight and adjusts the height.

The "grading" or classification of gas lifts is primarily distinguished based on their safety, durability, and material purity, and there is a widely cited international safety standard classification (SGS / TUV certification).

Class

Office chair gas lifts are mainly divided into Classes 1-4. The higher the class, the better the quality, with Class 4 being the highest tier.
Class 4 possesses optimal strength, safety, and durability, often featuring QPQ surface treatment, making it suitable for heavy-duty users. However, the components commonly found in the market are often the less durable Class 1 or Class 2.
It is recommended to choose Class 3 or Class 4 to ensure safety and long-term use. They can often be identified by the steel stamp or color on the rod core (a black rod core typically indicates Class 4).

Class	Features
Class 1 (Lowest):	Lowest grade, poorer quality, prone to degradation.
Class 2:	Basic grade, lower safety, not recommended for daily office use.
Class 3 (Most Recommended):	The most recommended grade. Features excellent durability and strong impact resistance; it is the standard configuration for most high-end ergonomic chairs.
Class 4 (Highest):	Highest grade, highest material purity, thickest tube wall, features excellent explosion-proof and corrosion resistance, suitable for high-frequency, heavy-weight, or extreme use environments.

Internal Material and Structure Grading (Affecting Safety)

Aside from load-bearing capacity, the internal structure and material purity of the gas lift are directly related to the risk of the gas lift "exploding" (although the probability is extremely low, it has occurred in the past).

Element	Criteria	Significance to Customer
Internal Gas	High-Purity Nitrogen (N2)	The gas lift must be filled with high-purity inert gas (Nitrogen). If impurities are mixed in or the pressure is improper, it can easily lead to internal gas overheating and pressure imbalance.
Tube Wall Thickness	Thickness Meets Standard (Class 3/4)	The outer tube of the gas lift must use steel material of sufficient thickness. Insufficient thickness is a common cause of the gas lift cracking under pressure impact, leading to accidents.
Piston Rod Material	Solid Piston Rod	The piston rod must be made of solid metal to ensure it does not bend or break during high-strength height adjustments.
Oil Seal Quality	High Durability Oil Seal	Poor quality oil seals can easily cause oil or gas leaks, leading to failure of the lift function.

Conclusion

★When purchasing an office chair, it is recommended to at least choose a gas lift that has passed Class 3 or Class 4 SGS certification, as this provides a basic guarantee of safety.
★The safety and class/grade of the gas lift cannot be determined from its external appearance. Please be sure to provide a copy of the SGS or TUV certification supplied by the original manufacturer to ensure complete peace of mind during use.