Office Chair Base Selection

When selecting an office chair base, it is essential to focus on functional comfort, type, material safety, and gas lift rod grade. Details are as follows:

Functionality and Comfort

The base is the core component of an ergonomic chair, directly affecting seating comfort. Traditional single-spring bases have uneven recline resistance, making it difficult for lighter individuals to recline and requiring more effort for heavier individuals to rise. Self-weight bases have improved but not completely resolved the issue of recline resistance. Currently, most bases on the market are spring-based, which have technical limitations. The 6th-generation space base developed by Sihoo uses special high-performance glass fiber material, enabling precise adjustment of recline resistance. Users of different weights can recline without pressure and rise easily, making it an excellent choice for functional comfort.

Common Base Types

• Single torsion spring base: Commonly found in ergonomic chairs priced under 500 yuan, it has two control levers for adjusting seat height and recline. It has a slender shape, no recline resistance, and the backrest is inserted directly through a hole. It is relatively common in chairs priced around 300-400 yuan, with normal safety but varying recline experiences.
• Mechanical base and cable-controlled base: Early office chairs mostly used mechanical bases, while cable-controlled bases are a later development. The two differ in operational experience, and the choice can be made based on personal operating habits and needs.

Material and Safety

Base materials include aluminum alloy, steel, PP, and ABS. The key details for judging material quality are explosion-proofing and thickness welding: A good base will have an explosion-proof iron plate welded at the gas lift rod position to prevent direct impact from gas rod issues. A base that is thickened to 2.5 millimeters and double-welded is less likely to deform or come unwelded during recline, offering higher safety.

Gas Lift Rod Grade

The gas lift rod controls the height adjustment. According to the European standard EN16955, gas lift rods are classified into four grades. For general office use, start with Class 3 (with a load capacity of 1700 to 2700 Newtons), and for important positions, Class 4 (over 2700 Newtons) is recommended. Also, consider the rod wall thickness. For example, the Lite gas lift rod has a wall thickness of 1.2 millimeters, a pressure value between 42 and 44 kilograms, passes the BIFMA test, and can withstand 100,000 height adjustments without jamming or leakage, ensuring safety and stability in use.