High density polyethylene skateboard car prices

(A) wear of UHMWPE wear Habitat plastic crown, and over some of the metal, Figure 1 is a UHMWPE wear resistance compared to other materials. As can be seen from Figure 1, compared with other engineering plastics, UHMWPE wear index mortar only PA66 (nylon 66) 1/5, HDPE (high density polyethylene) and PVC (polyvinyl chloride) 1/10; Compared with metal, carbon steel 1/7, 1/27 brass. Such a high abrasion resistance, so that the abrasion test method with the general plastic difficult to test their degree of wear, which designed a mortar abrasion testing device. UHMWPE wear and proportional to molecular weight, the higher the molecular weight, the better the wear resistance. (B) Impact resistance UHMWPE ultra high impact strength polyethylene, among the best in all the engineering plastics, the impact strength of UHMWPE is about 2 times the impact resistance PC, ABS ABS resin one (the five synthetic resin, its impact resistance , heat resistance, low temperature resistance, chemical resistance and excellent electrical properties, but also has easy processing, products dimensional stability, surface gloss and good features, easy to paint, coloring,) five times, POM (often said for POM, acetal resin also known as the Race of steel, Trane.) and PBTP (polyethylene terephthalate), more than 10 times. Impact resistance is so high that the usual impact test method is difficult to break it destroyed. The impact strength improves with increasing molecular weight, the molecular weight reaches a maximum at 1.5 million, and then continue to rise with the molecular weight gradually decreased. It is worth noting that in the liquid chlorine (-196 ℃) can maintain excellent impact strength, this feature is no other plastics. In addition, it is a higher surface hardness after repeated shocks. (C) self-lubricating UHMWPE has an extremely low coefficient of friction (0.05 to 0.11), it has excellent self-lubricating. Second only to the best self-lubricating plastic polytetrafluoroethylene (PTFE) in the absence of lubrication; when it works in the form of sliding or rotating, than steel and brass add the oil lubrication even better. (Iv) chemical resistance UHMWPE has excellent chemical resistance, in addition to strong fluoride acid, but at a certain temperature and concentration ability of corrosive media (except for naphthalene solvent) (acid, alkali, salt) and organic media . Immersed in 80 kinds of organic solvents 20 ℃ and 80 ℃ in the 30d, look no anomaly, other physical properties are almost no change. (V) impact energy absorbability UHMWPE has excellent impact energy absorption, the maximum impact energy absorption value in all plastic, and therefore very good noise damping properties, excellent noise reduction effect. (Vi) low-temperature resistance UHMWPE has excellent low temperature performance, at liquid helium temperature (-269 ℃) still malleable, it is possible to make low temperature member nuclear work. (Vii) non-toxic health UHMWPE health non-toxic, fully compliant with Japan Health Association, and the US Food and Drug Administration and the US Department of Agriculture approved, it can be used in contact with food and medicines. (H) non-stick UHMWPE surface adsorption force is very weak, and its anti-adhesion ability not only to plastic viscosity best PTEE, thus the product surface and other materials difficult to adhere to. (Ix) hydrophobic UHMWPE absorption is very low, generally less than 0.01%, only 1% of PA6, which in general do not have dried before molding process. (X) has a tensile strength due to the structural characteristics of UHMWPE ultra stretch orientation necessary, so there unmatched high tensile strength, it can be measured by gel spinning method ultra high modulus and strength of the fiber, which tensile strength of up to 3 ~ 3.5GPa, tensile modulus of elasticity of up to 100 ~ 125GPa; fiber strength of all fibers have been commercialized so far the highest, four times larger than carbon fiber, 10 times more than steel, more than aramid fibers 50%.