Office Chair Technical Document

The office chair technical document primarily covers two core aspects: the EN 1335 standard and QBT 2280 'Office Furniture - Office Chairs'. Details are as follows:

I. EN 1335 Standard: Core Specifications for Safety and Ergonomics

EN 1335 is an international standard addressing the safety and ergonomic performance of office chairs, applicable to seating in office environments where chairs are used continuously for several hours and classified according to user weight and height. Its core content is divided into three parts:

1. Dimensions and Static Strength (EN 1335-1)

   • Defines basic parameters of office chairs, such as seat height, backrest height, and seat depth. Recent revisions have added specific numerical requirements for the adjustability of lumbar support height to ensure chairs accommodate users of different body types.
   • Static strength tests cover the load-bearing capacity of components like the seat and backrest, simulating structural stability under long-term use.

2. Safety Requirements (EN 1335-2)

   • Stability Testing: Simulates unintended use conditions (e.g., leaning forward or sideways), stipulating that the chair's tipping threshold must exceed typical usage scenarios. It quantitatively evaluates the deformation and fatigue resistance of chair legs and bases.
   • Durability Testing: Conducts tens of thousands of cycles of testing on adjustable components (e.g., height adjustment mechanisms, backrest tilt mechanisms, armrests) to ensure reliability under extreme usage frequencies.
   • Mobility Performance and Floor Protection: For office chairs with casters, tests the rolling resistance and steering flexibility of casters on different floor materials, requiring that the materials do not scratch or damage the floor.

3. Ergonomic Evaluation (EN 1335-3)

   • Combines subjective and objective indicators, using measuring instruments to record the deformation of the chair under specific loads, assessing whether dynamic comfort meets general expectations.
   • Sets limits for the adjustable range of various chair dimensions, based on anthropometric data, ensuring effective support for key areas (e.g., lumbar region, buttocks).
   • Flame Retardancy: Requires materials such as foam and textiles to self-extinguish within a specified time after the removal of an open flame source, limiting the speed and extent of combustion.

II. QBT 2280 'Office Furniture - Office Chairs': Updates and Refinements in Domestic Standards

This standard, drafted in accordance with GB/T 1.1—2020, replaces QB/T 2280—2016. Key technical changes include:

1. Upgraded Material Requirements
   • Adds performance indicators for soft polyurethane foam, textile fabrics, leather/recycled leather (hide), and artificial leather, enhancing environmental protection and durability.
2. Optimized Mechanical Performance
   • Modifies several test conditions (e.g., cycle counts and load intensity for durability tests), removes the requirement for 'base static load', and better aligns with actual usage scenarios.
3. Enhanced Safety and Environmental Protection
   • Combines 'formaldehyde emission' and 'TVOC' into a requirement for 'product hazardous substances', reducing the risk of indoor air pollution.
   • Revises 'basic safety' requirements, such as edge chamfering and small-part detachment prevention, to minimize usage hazards.
4. Improved Test Methods
   • Clarifies maximum allowable measurement errors, enhancing the accuracy and repeatability of test results.

Summary: EN 1335 provides international specifications for the safety, durability, and ergonomic design of office chairs, while QBT 2280 refines material, environmental, and safety requirements based on domestic needs. Together, they offer technical guarantees for the quality of office chairs.