1/2 machinable polyethylene plastic sheet exporter MACHINABLOkay MATERIAL SAMPLE PACK Plastic Sheet HENAN OKAY, Acetal, Acrylic, HDPE, PVC, UHMW, PTFE. This sample pack includes a 6x6" sample of HENAN OKAY, Acetal, Acrylic, HDPE, PVC, UHMW, and a 3x3" sample of PTFE. Thicknesses vary, but tend to range from 1/4" thick to an inch thick.