Principal Traits of High Density Polyethylene (HDPE)3
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Posted On :
Aug-10-2011
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Article Word Count :
434
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HDPE is a sort of thermoplastic resin with high crystallinity and non-polarity. Original HDPE appears milk white and semi translucent in a little section to some degree.
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HDPE is a kind of thermoplastic resin with high crystallinity and non-polarity. Original HDPE appears milk white and semi translucent in a little section to some degree. PE has exceptional resistance to most chemicals in life and business. Some kinds of chemicals will produce 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 fairly very good electricity performance, specifically the strength of insulation and dielectric, HDPE is rather applicable to make wire and cable. What's a lot more, HDPE with medium to high molecular level possesses extremely good impact resistance, even in low room temperature of 40 F.
Unique characteristic of several levels of HDPE will be the appropriate mixture of the following 4 basic variables: density, molecular weight, distribution of molecular weight and additives. Different kinds of additives are utilised inside the production of polymers with unique performance. Hence, these variables combine to produce HDPE with various levels and usages; the performance might be within the most effective balance.
Density is the main variable that decides the characteristics of HDPE, even though four variables mentioned play a role that influence each other. Ethylene is the main raw material of polyethylene. Couple of other monomers, for example l-fullerene and 1-essien, are also frequently utilized to boost the performance of polymer. As to HDPE, the content of couple of monomers above is frequently much less than 1% to 2%. An added monomer fairly reduces the crystallinity of polymer. This change is usually measured by density, while density and crystallization rate are in a linear connection. According to regulations of ASTM D1248, the United States commonly 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, sometimes MDPE is classified as ptfe rod or LLDPE.
Homo-polymer with the greatest density as well as the greatest stiffness has great permeability control and the greatest melting point. But generally it has fairly poor cracking resistance to environmental stress (ESCR). At the exact same time, ESCR is resistance of PE to cracking caused by mechanical or chemical anxiety. Greater density generally improves the mechanical strength performance, for example tensile strength, stiffness and hardness. The main raw materials used to make teflon film. Thermal properties such as softening point temperature and heat distortion temperature are enhanced; the permeability, for instance 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_Principal Traits of High Density Polyethylene (HDPE)3_72864.aspx
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Author Resource :
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Keywords :
Ptfe rod, teflon sheet,
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