Office Chair Testing Methods

Office chair testing methods cover four main aspects: physical properties, chemical safety, ergonomics, and sensory identification. The specific testing procedures and standards are as follows:

Physical Property Testing

1. Material and Structural Safety: Verify the authenticity of materials (such as leather texture, metal strength), physical properties (load-bearing capacity, impact resistance), and structural stability (weld points, fastener firmness).
2. Stability Testing:
   • Static Testing: Use a rigid loading block to simulate human weight (covering 80%-95% of the seat depth), apply a 250-Newton horizontal force, and observe whether the chair legs lift off the ground.
   • Dynamic Testing: The loading block swings freely to impact the chair back, simulating the sudden impact of leaning back. The test surface must be a rigid horizontal plane, and the chair wheels should be locked.
3. Durability Testing:
   • Seat and Backrest: Use a simulated buttock impact device to load 100,000 times at a frequency of 10-20 times per minute, recording structural damage.
   • Casters: Simulate rolling friction and impact through a dedicated platform, testing for 72,000 cycles (approximately 12 months of usage frequency), requiring an increase in rolling resistance of ≤50%, a rotational deviation of ≤5 degrees, and no parts falling off; or conduct an 8-kilometer travel test.
   • Gas Cylinders: Complete 120,000 lift cycles.
   • Base: Conduct a 2.5-times load-bearing test.
4. Gas Spring Testing:
   • Single Unit Testing: Focus on support force, sealing, and lifespan, checking the physical and chemical properties of materials such as piston rod coatings and cylinder steel.
   • Component and Whole Chair Testing: Verify lift smoothness, abnormal noise, and fit quality. Testing should be conducted after placing the chair in a standard environment (23±2°C, 50±5% humidity) for 48 hours to avoid interference from transportation or temperature.

Chemical Safety Testing
For fabrics, foam, and plastic components, test for formaldehyde emission (collecting data over 28 days using the climate chamber method), decomposable carcinogenic aromatic amine dyes, and heavy metal content (lead, cadmium, mercury, chromium). Sampling should be conducted according to standard parts separately.

Ergonomic Testing

1. Adjustment Function Verification: Test whether the height adjustment range, backrest tilt angle, and armrest height adjustment meet design standards.
2. Pressure Distribution Testing: Use a seat surface pressure distribution testing pad with over 2,000 sensing points to record peak pressure and distribution during sitting. Testers with body types ranging from the 5th to 95th percentile are invited to participate in the evaluation.

Sensory Identification Method
Preliminarily judge materials through "looking, touching, and sitting":

• Looking: Genuine leather has a natural texture, while synthetic leather has a regular texture.
• Touching: Genuine leather is soft, delicate, and firm, while synthetic leather feels stiff.
• Sitting: Genuine leather has good breathability and does not stick to the body after prolonged sitting, while synthetic leather tends to feel hot and stuffy.

The testing process must strictly follow standardized operating procedures to ensure objective and reliable data.