Introduction to EN 1335: The Standard for Testing Office Chairs
Sep 22, 2025
Introduction to EN 1335: The Standard for Testing Office Chairs
Office chairs should feature adjustable functions to accommodate individuals of varying heights and body types, as well as different work environments, such as seat height, backrest height, and tilt angle. For those who work long hours, a good office chair enables a more comfortable sitting posture during work.
What is the EN 1335 standard?
EN 1335 is a European ergonomic standard that specifies requirements for the dimensions and adjustability of office chairs. Therefore, a quality office chair will comply with this standard. Without delving into the highly detailed specifications, the standard essentially ensures that an office chair can be properly adjusted to fit the user's body.
Seat depth
An important point to consider when choosing an office chair is the seat depth. It is important to look at the seat depth and whether it is still adjustable, so that it can be adapted to the user's height.
Seat height
Seat height is also an important factor to consider. The chair must be adjustable in height so that the user can keep their feet flat on the ground and bend their knees at a 90-degree angle. This ensures good blood circulation and prevents fatigue and pain in the legs.
Adjustable armrests
Adjustable armrests are also important when choosing an office chair. They must be adjustable in height so that the user can comfortably rest their arms while typing or writing. This prevents the shoulders from being pulled up, which can lead to tension in the neck and shoulders.
Adjustable backrest
An adjustable backrest is also an important part of a good office chair. The backrest must be adjustable in both height and angle so that the user can adjust it to their back. This ensures good support of the lumbar spine, which reduces the risk of back pain.
Materials and Backrest
In addition to these important factors, there are other aspects that play a role in the comfort of an office chair, such as the upholstery, the material of the armrests, and the shape of the seat and backrest. Therefore, it is important to consider all these aspects when choosing an office chair.
This EN 1335 ensures that the chair can be properly adjusted to the individual body shapes and dimensions of the user, thereby increasing the comfort and productivity of the user and reducing the risk of physical complaints.
GESTER Office Chairs Testers Compliant with EN 1335 Standards
Swivel Chair Caster Durability Testing Machine GT-LB07
The Swivel Chair Caster Durability Tester applies to test all chair types with a swivel seat or with castors.
And the testing machine equip with 2 functions:
1.Chair swivel durability test:The base of the chair shall be secured on a rotating table so that the rotating axis of the chair coincides with the rotating axis of the table. The upper part of the chair shall be loosely fixed in such a way as not to hinder the rotation of the base. Load the seat in loading point with the specified additional load. Then rotate the chair at the specified rate and angle. Change direction after each rotation. Thus,to test the chair swivel structure durability.
2.Castors durability test:Load the seat with the specified load,the base and whose upper parts shall be loosely fixed in such a way that there is no rotation of the base but that the natural swivel of the castors during testing are not prevented, thus,to test the castors durability.
Standards:
EN 1728-2012 Section 6.29 method 1, 7.11 ,7.13 method 1
ANSI/BIFMA X5.1 - 2011 Section 9 ,
EN1335-3 -2009 Section 7.3.3, 7.3.5 method 1
QB/T 2280-2007 Section 6.6.12,
Chair Assembly Testing Machine GT-LB08-02
This Chair Assembly Testing Machine is according for the standard EN 1728 and combination with different methods:
Seat static load and back static load test
Seat and back durability test
Seat front edge static load test
Seat front edge durability test
Seat impact test
Back rests vertical load test
Back rests horizontal forward static load test
Headrest static load test
Foot rest static load test or durability test
Back impact test
Leg rest static load test
Leg forward or sideways static load test
Arm rest sideways static load test
Arm rest downwards static load test
Arm rest durability test
Arm rest impact test
Auxiliary writing surfaces static load test and durability test
Arm rests vertical upwards static load test
Standards
EN 1728-2012 Section 6.4, 6.5, 6.6, 6.7, 6.8, 6.9, 6.10, 6.11, 6.12, 6.13, 6.14, 6.15, 6.16, 6.17, 6.18, 6.20, 6.21, 6.22, 6.24, 6.25, 6.26, 7.3, 7.4, 7.5, 7.6, 7.7, 7.8, 7.9, 7.10, 7.12
EN 581-2-2015 （correspond EN1728-2012),
EN 16139-2013 （correspond EN1728-2012),
EN 1335-3 -2009 Section 7.2, 7.3.1, 7.3.2, 7.3.4,
EN 1729-2-2012 Section 5.3
ISO 7173-1989 Section 7.1, 7.2, 7.3, 7.4, 7.5, 7.6, 7.7, 7.8, 7.9, 7.10, 7.11, 7.12
GB/T 10357.3 -2013 Section 4.3, 4.4, 4.5,4.6, 4.7, 4.8,4.9, 4.10,4.11, 4.12, 4.13 , 4.14
BS 5459-2-2000 Section A5.1, A5.2, A5.3, A5.5, A7.2, 7.3, A7.4, A7.7, A7.9
