Ultra high molecular weight polyethylene （HMW PE） is a kind of high molecular compound. It is difficult to process, and has super strong wear resistance and self lubrication. It has high strength, stable chemical property and strong anti-aging property. The density of polyethylene is between 0.93-0.95, and its density is small. It can float on the water surface. UHMWPE products will not melt or deform at 200 ℃， but will become soft. Compared with other engineering plastics, UHMWPE has the disadvantages of low surface hardness, low temperature of thermal deformation, poor bending strength and creep performance. This is due to the molecular structure and aggregation morphology of UHMWPE, which can be improved by filling and crosslinking
　　
　　Ultra high molecular weight polyethylene （HMWPE） is a kind of high molecular compound. It is difficult to process, and has super strong wear resistance, self lubrication, high strength, stable chemical property and strong anti-aging property. Therefore, we must pay attention to these characteristics when distinguishing true and false polymer polyethylene.
　　
　　1. Weighing rule: the product made of pure UHMWPE has a specific gravity of 0.93-0.95, a small density and can float on the water surface. If it is not pure polyethylene, it will sink to the bottom of the water.
　　
　　2. Temperature measurement: pure UHMWPE products will not melt or deform at 200 ℃， but will become soft. If it is not pure UHMWPE material, it will deform at 200 ℃。
　　
　　3. Visual method: the surface of real UHMWPE is flat, uniform, smooth and the section density is very uniform. If it is not pure polyethylene material, the color is dim and the density is uneven.
　　
　　4. Edge test method: the flanging end face of pure UHMWPE is round, uniform and smooth. If there is crack on the flanging end face of non pure polyethylene material, and slag will fall when flanging after heating.