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Office Chair-Back Strength Tester
CNS 3089 S1072
1. Seat’s on-load durability and back structure strength of office chair: exert 55kgs force on the seat surface by pulling up chair seat or pushing out back plate, making chair’s front feet suspend above floor for over 50mm, then put it down to floor surface. And repeat this process for certain cycles according to different chair sort. Then, take out the chair and observe if any crack or damage is found on it, on particular the welded joints or connecting portion.
2. Back’s structure strength: fix the chair on floor and constantly exert 60kgs force to the back part for 5 consecutive seconds ; repeat this process for 30 times, then, take the chair out and observe if any crack or damage is found on it, on particular the welded joints or connecting portion.

Model Seat’s on-load durability Back’s structure strength
Load 55 kgs 60 kgs
Suspended distance of chair’s front feet above floor 50 mm n/a
Loading time reserved n/a 5 seconds
Test speed 25 cpm n/a
Test time 4000 or 8000 30 times
Power source Single phase, 110V/220V; 50/60Hz
Volume Depend on chair sort
Weigh Depend on chair sort
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