This standard BS EN 1335-2:2018 Office furniture. Office work chair is classified in these ICS categories:
13.180 Ergonomics
97.140 Furniture
This document specifies safety, strength and durability requirements for office work chairs. It does not apply to other seating in the office area for which other European Standards exist. The requirements are based upon use for 8 h a day by persons weighing up to 110 kg. Annex A (informative) contains loads, masses and cycles for functional tests.