The steel thickness must be thick enough, at least 2.5mm for the steel plate, and at the cone position 3.0mm thickness
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The function for adjusting the chair's height must be OK, and can control the gas lift's up&down without any problems
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The locking function must be smooth and good enough
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The knob to control the gas spring's tension must be good, and the spring inside of the knob strength much be good enough.
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If the mechanism have the slider, the slider must be smoothly and can be locking at the appropriate positions.
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The chair mechanism must to pass BIFMA Destroying Testing
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The chair mechanism must to pass BIFMA Duration testing, the unit shall be cycled for 300,000 cycles at a rate between 10 and 30 cycles per minute.
