Major Characteristics involving High Density Polyethylene (HDPE)
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Posted On :
Aug-11-2011
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Article Word Count :
435
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HDPE is a kind of thermoplastic resin with high crystallinity and non-polarity. Original HDPE appears dairy white and semi translucent in a tiny section to some degree. PE has superb resistance to most chemicals in life and industry.
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HDPE is a kind of thermoplastic resin with high crystallinity and non-polarity. Original HDPE appears dairy white and semi translucent in a tiny section to some degree. PE has superb resistance to most chemicals in life and industry. Some kinds of chemicals will generate chemical erosion, such as corrosive antioxidant (nitric acid), aromatic hydrocarbons (dimethyl benzene) and halogenating hydrocarbon (carbon tetrachloride). The polymer does not absorb moisture and has good steam resistance, which may be utilised for packaging. With quite excellent electricity performance, in particular the strength of insulation and dielectric, HDPE is exceptionally applicable to make wire and cable. What's extra, HDPE with medium to high molecular level possesses exceptionally beneficial impact resistance, even in low room temperature of 40 F.
Unique characteristic of numerous levels of HDPE is the proper combination of the following 4 fundamental variables: density, molecular weight, distribution of molecular weight and additives. Diverse sorts of additives are employed inside the production of polymers with particular performance. For that reason, these variables combine to produce HDPE with distinctive levels and usages; the performance might be inside the best balance.
Density is the primary variable that decides the characteristics of HDPE, while 4 variables mentioned play a role that influence one another. Ethylene is the primary raw material of polyethylene. Few other monomers, for example l-fullerene and 1-essien, are also usually employed to enhance the performance of polymer. For HDPE, the content of couple of monomers above is typically much less than 1% to 2%. An added monomer to some extent reduces the crystallinity of polymer. This alter is usually measured by density, when density and crystallization rate are in a linear rapport. In line with regulations of ASTM D1248, the United States in most cases classified HDPE. HDPE density is 0.940g /CC or above; medium density of polyethylene (MDPE) is 0.926 ~ 0.940 g/CC. In other classification, at times MDPE is classified as ptfe rod or LLDPE.
Homo-polymer with the biggest density as well as the greatest stiffness has very good permeability control and the greatest melting point. But typically it has fairly poor cracking resistance to environmental tension (ESCR). At the same time, ESCR is resistance of PE to cracking brought on by mechanical or chemical tension. Higher density generally improves the mechanical strength performance, which include tensile strength, stiffness and hardness. The main raw materials used to make teflon film. Thermal properties like softening point temperature and heat distortion temperature are enhanced; the permeability, such as gas permeability and water vapor permeability are also promoted. Meanwhile, the lower density improves the impact strength and E-SCR.
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Article Source :
http://www.articleseen.com/Article_Major Characteristics involving High Density Polyethylene (HDPE) _72994.aspx
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Author Resource :
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Keywords :
Ptfe rod, teflon sheet,
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