European Testing of Office Chairs

The testing of office chairs in Europe is primarily based on the EN 1335 standard, which systematically verifies office chairs from three aspects: ergonomics, structural safety, and long-term reliability. Details are as follows:

I. Core Components of the EN 1335 Standard

EN 1335 is a specialized safety standard formulated by the European Union for office chairs, divided into three parts:

1. EN 1335-1: Ergonomic Dimensional Specifications Office chairs are classified into three categories based on user height percentiles: A (small stature), B (medium stature), and C (large stature). Parameters such as seat height, seat depth, backrest height and width, and armrest spacing are specified. For example, the adjustable range for seat height must cover 38-51 centimeters (with a lower limit for Category A and a higher limit for Category C). Seat depth is restricted to 40-44 centimeters through adjustable mechanisms or fixed designs, ensuring reasonable support for users of different body types and preventing fatigue from prolonged sitting.

2. EN 1335-2: Structural and Material Safety Requirements It stipulates that office chairs must pass strength and durability tests (method standard: EN 1728:2012), including:

   • Seat Impact Test: A rigid hemisphere with a diameter of 300 millimeters and a weight of 50 kilograms is repeatedly dropped freely from a height of 20 centimeters to the center of the seat for 10,000 cycles to check for structural cracking or deformation.
   • Backrest Reclining Mechanism Test: A backward thrust of 200 Newtons is applied to the backrest at a frequency of 10 times per minute for 20,000 cycles, requiring no damage to the mechanism and normal rebound function.

3. EN 1335-3: Mechanical Testing Methods The long-term reliability of office chairs is verified by simulating real-world usage scenarios (such as normal stress and reasonable abuse), for example, testing the structural stability of chairs after repeated adjustments, movements, or minor impacts.

II. Core Testing Dimensions of EN 1335

1. Ergonomic Dimensional Verification Standard dummies are used to simulate human sitting postures and weights to calibrate parameters such as seat cushion depth, seat height, backrest support angle, and armrest spacing, ensuring that the chair's dimensional design conforms to ergonomic logic and reducing the risk of waist and neck fatigue caused by unreasonable dimensions.

2. Comprehensive Stability Testing The risk of tipping over for office chairs in different scenarios is simulated, including:

   • Forward Stability: The ability to prevent sideways tipping when a user suddenly leans forward to retrieve an object.
   • Backward Stability: The ability to prevent tipping over when reclining backward.
   • Lateral Stability: The ability to prevent sideways tipping when getting up from one side.

3. Strength and Durability Testing Through seat static pressure tests, backrest cyclic durability tests, etc., the structural stability and material durability of chairs during long-term use are verified to ensure they can withstand daily wear and tear without failure.

III. Precautions

The EN 1335 standard does not cover electrical safety or chemical substance restrictions (such as formaldehyde and heavy metal content), which are separately regulated by directives such as REACH or the Low Voltage Directive. Passing the EN 1335 test only indicates that the chair meets the standard in terms of ergonomic fit and mechanical structural reliability. When exporting to the European Union, a complete compliance report must be submitted in conjunction with CE marking-related assessment documents.