The sample is to be subjected to a crushing force that deforms the DUT by 50% but no greater force than 1,000 times weight of the DUT or 100 kN, whichever comes first. The crushing force is to be applied at a rate of approximately 1.5 cm/s upon first contact with the sample. The crush is to be applied in each of 3 mutually perpendicular directions with the ribs centered on the sample in each direction of press.