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 HDPE high density polyethylene, 
 English name: "High Density Polyethylene". 
 Physical and chemical properties: melting point of about 131 ℃, density of 0.941 ~ 0.960, it has good heat resistance and cold resistance, softening point of 125 ~ 135 ℃ embrittlement temperature of -70 ℃, 100 ℃ temperature up to wear better. Electrical insulation, toughness, cold resistance are good, but slightly worse with the low-density polyethylene. Shrinkage: 1.5% to 4% 
 According to different types of PE can be used for: pharmaceutical packaging, industrial, production flow trays, chemicals, packaging, pharmaceutical packaging, spices and some beverages, etc.; also be used as sound insulation, heat insulation and ceiling materials, and instead of wood, steel used for furniture and construction materials. 
 Ultra-high molecular weight polyethylene sheet (UHMWPE) Features: 
 Service life than steel, carbon steel and stainless steel wear resistance of 3 to 7 times; friction coefficient is small, self-lubricating, non-absorbent, non-adhesive materials, impact resistance, high strength, good mechanical properties, acid, alkali , salt corrosion, aging, low temperature, health non-toxic, light weight, the proportion of steel 1 / 8, therefore, is used for bulk material storage and transport equipment, the best lining materials, such as silos, flow ducts. Widely used in electric power, steel mills, coal mines and so on industry. 
 Ultra-high molecular weight polyethylene (UHMWPE) plate with high wear and corrosion resistance, impact resistance, self-lubricating, can be made loading coal, cement, lime, slag, salt, cereals, powdered materials, hopper, silo, chute lining. Because of its excellent abrasion resistance, self-lubricating and non-sticky, so that the powder material on the storage device, the phenomenon of adhesion does not occur, to ensure stable transportation. 
 This high wear-resistant plates to adapt to various environmental conditions of installed applications can be designed into the structure can be assembled to connect to user requirements, ease of installation and maintenance. Very difficult operating conditions, such as coal mine installed hopper, chute, hopper feeding the metallurgical industry and other applications that can solve the transportation bonding and sealing process of this long-standing problem, to achieve safe, efficient normal production. 
 1, mechanical properties 

 Indicators Unit Test Method index 
 Density g/cm3 ASTM1505 0.94 
 Tensile strength MPa D638 42 
 Elongation at Break% D638 350 
 Charpy notched impact strength Kj/m2 D256 ≥ 100 

 2. Thermal properties: 

 Indicators Unit indicators measuring method 
 Melting point ℃ ASTMD2117 136 
 Vicat softening point ℃ ASTMD1512 134 
 Account thermal expansion coefficient 10-4 / ℃ ASTMD648 1.5 
 Heat distortion temperature (4.6kg/cm2) ℃ ASTMD648 90 

 Electrical properties: 

 Indicators Unit Test Method index 
 Volume resistivity ohm. Cm ASTMD257 1017 
 Surface Resistivity ohm ASTMD257 1013 
 Dielectric strength kV / mm ASTMD149 900 
 Dielectric constant 106 Hertz ASTMD150 2.3 

 Cold resistance 
 High-density polyethylene molecular weight of more than 500,000, the brittle transition temperature dropped to -140 ℃. UHMWPE can even liquid nitrogen or liquid helium in the role, the use of the following temperatures up to -269 ℃, there are certain mechanical strength. 
 Wear 
 UHMWPE has excellent wear resistance, higher molecular weight, wear resistance, the better. 
 High compared with other materials wear parameters 

 Material UHME-PE PTFE PA66 POM yellow 45 # carbon steel stainless steel 
 The average wear rate 0.74 2.31 1.51 3.1 4.02 4.05 16.74 

 Note: The wear resistance test conditions: 
 Sand / water = 3 / 2 (important than) 16 mesh to 24 mesh selection / construction when the sand between, the specimen speed 800 r / min, every inch specimens 60mm × 40mm × 3mm, 7 mill each specimen are hours. 
 Relatively high molecular weight polyethylene wear rate 

 Product weight average wear rate% 
 5.7 million high molecular weight polyethylene 0.30 
 4,000,000 0.41 
 0.45 3.8 million 
 0.50 2.8 million 
 0.74 1.6 million 

 6. Impact strength 

 Material UHMWPE HDPE ABS PA66 PC POM PTEE 
 Impact strength 
 Kj/m2 ≥ 100 27 16 ~ 44 6 ~ 11 71 ~ 95 8 ~ 13 16 

 Note: The test method according to ASTMD256. 
 7. Friction coefficient 
 Coefficient of friction UHMW-PE is a self-lubricating because it can no oil under the conditions to the form of sliding or rotating work than steel and copper in lubricating the occasion of the better lubricity. 

 Resin-free lubricating oil lubricating water 
 UHMWPE 0.0.7-0.11 0.005-0.10 0.05-0.08 
 PTFE 0.04-0.1 0.04-0.08 0.04-0.05 
 Nylon 66 0.15-0.40 0.14-0.19 0.06-0.11 
 0.15-0.35 0.10-0.20 0.05-0.10 POM 

 Note: Test conducted by way of ASTMD1894 
 8 .. water absorption 
 Ultra-high molecular weight polyethylene of very low water absorption, and therefore its mechanical properties and use of working conditions in the temperature factor has nothing to do. 

 Material UHME-PE ABS PA66 PC POM PTEE 
 Water absorption% <0.01 0.20 0.45 1.5 0.15 0.25 <0.01 

 Note: The test method according to ASTM570 
 9. Excellent chemical resistance 
 High chemical stability of UHMWPE, at a certain temperature, the concentration range of acid and alkali, salt and other corrosive media (acid, alkali, salt), and the role of organic solvents. 
 10 non-toxic 
 UHMWPE tasteless, non-toxic, odorless, non-corrosive in itself, with the physiological cycle and physiological adaptation, the U.S. Food and Drug Administration (FDA) and U.S. Department of Agriculture (USDA) to allow it to be used with food and Drug exposure to the occasion, so for food, medicine and other health conditions are higher for the industry.