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Contact SupplierInside the chairs of cars or motorcycles, the major filling is compounded foam. The quality of the foam matters the comfortability. This tester adopts the type of computer control to measure it original thickness of the foam. Compress 75% for its original thickness, release and then re-compress 25% for its original thickness and sustain for 20 seconds. After that, record its force and which is the hardness of this compounded foam.