Office Chair Caster Standards

Office chair caster standards cover domestic standards (QB/T 4765-2014), European standards (EN1335), and general testing items and equipment requirements, as detailed below:

I. Domestic Standards (QB/T 4765-2014)

1. Performance Indicators:

   • Load and Wear Resistance: Gradient load indicators are set based on usage scenarios, specifying the number of reciprocating motion tests and the upper limit of wear rate. For example, casters for ordinary office scenarios must pass a certain number of rolling tests with a wear rate not exceeding the specified value.
   • Corrosion Resistance: Requirements include passing salt spray tests (e.g., 48 hours or longer), with surface oxidation treatments meeting standards to prevent rusting of metal components.
   • Rotational Flexibility: Specified ranges for rotational resistance torque parameters ensure smooth rotation of casters without jamming.
   • Special Environmental Requirements: Anti-static casters must meet anti-static coefficient standards, while casters for low-temperature environments must pass anti-embrittlement tests.

2. Testing Method System:

   • Three-Level Testing: Includes type testing (basic items such as dimensional deviations and material composition), routine testing (usage performance such as rotational accuracy and brake effectiveness), and destructive testing (safety indicators such as ultimate load and impact strength).
   • Equipment and Environment: Testing equipment must comply with the GB/T 16491 standard, with the test environment temperature controlled at (23±2)℃ and relative humidity at (50±5)%.

3. Management Mechanism:

   • The National Furniture Standardization Center is responsible for technical interpretations, with standards reviewed every five years. The most recent confirmation of current validity was during the 2021 filing information update.

II. European Standards (EN1335)

1. Stability Testing:

   • Static and Dynamic Testing: Standardized force values and position settings simulate the tipping point when users lean forward, backward, or sideways, using rigid loading blocks (usually simulating body weight) to test whether the chair legs lift off the ground or the chair back flips over.

2. Caster Durability Testing:

   • Simulating Long-Term Use: The caster contact surface bears a specified load (e.g., 100 kg), rotating alternately at a speed of 10 revolutions per minute for 72,000 reciprocating linear motions.
   • Judgment Criteria: The increase in rolling resistance, rotational deviation angle, and part detachment must meet requirements.

3. Testing Environment and Pre-treatment:

   • All tests are conducted under standard conditions of 23℃ temperature and 50% relative humidity, with samples first stored in a constant temperature and humidity chamber for 48 hours.

III. General Testing Items and Equipment

1. Testing Items: Cover mechanical properties (durability, static load, impact load), physical properties (rolling resistance, rotational performance, braking performance), chemical properties (hazardous substance detection), and wear resistance testing.
2. Testing Equipment: Includes caster durability testers, universal material testers, rolling resistance testers, rotational performance test benches, braking performance test devices, abrasion testers, and auxiliary tools (e.g., precision balances, vernier calipers).