UHMWPE identification methods: Weighing law. Pure ultra high molecular weight polyethylene products made of gravity between 0.93-0.95 polyethylene wearable pieces, smaller density polyethylene wearable pieces wholesale, can float on water. If it is not pure polyethylene material, it will sink to the bottom. Temperature measurements. UHMWPE forming: General. Extrusion. China in the end of 1994 developed the ultra-high molecular weight polyethylene Φ45 single screw extruder, and made Φ65 single-screw extrusion production line pipe industrialization success in 1997. Injection molding. Of 1983 on the domestic XS-ZY-125A-type injection molding machine was modified to successfully inject a beer canning line with ultra-high molecular weight polyethylene (UHMW-PE) roller, pumps with the sleeve, in 1985 and successfully injected a medical artificial joints.