Main Traits with High Density Polyethylene (HDPE)7
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Posted On :
Aug-11-2011
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Article Word Count :
431
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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 great 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 milk white and semi translucent in a little section to some degree. PE has great resistance to most chemicals in life and industry. Some sorts of chemicals will generate chemical erosion, including corrosive antioxidant (nitric acid), aromatic hydrocarbons (dimethyl benzene) and halogenating hydrocarbon (carbon tetrachloride). The polymer doesn't absorb moisture and has excellent steam resistance, which may be employed for packaging. With rather good electricity performance, especially the strength of insulation and dielectric, HDPE is rather applicable to make wire and cable. What's extra, HDPE with medium to high molecular level possesses very beneficial impact resistance, even in low room temperature of 40 F.
Unique characteristic of several levels of HDPE is the correct combination of the following 4 simple variables: density, molecular weight, distribution of molecular weight and additives. Distinct sorts of additives are utilized inside the production of polymers with particular performance. Hence, these variables combine to produce HDPE with unique levels and usages; the performance might be in the best balance.
Density is the leading variable that decides the characteristics of HDPE, despite the fact that four variables mentioned play a role that influence each other. Ethylene is the primary raw material of polyethylene. Couple of other monomers, including l-fullerene and 1-essien, are also often utilised to increase the performance of polymer. As to HDPE, the content of couple of monomers above is usually much less than 1% to 2%. An added monomer a little bit reduces the crystallinity of polymer. This alter is generally measured by density, even though density and crystallization rate are in a linear relationship. As per regulations of ASTM D1248, the United States most often 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 very best density as well as the greatest stiffness has great permeability control and the biggest melting point. But typically it has fairly poor cracking resistance to environmental pressure (ESCR). At the similar time, ESCR is resistance of PE to cracking brought on by mechanical or chemical tension. Higher density typically improves the mechanical strength performance, like 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, which include 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_Main Traits with High Density Polyethylene (HDPE)7_73002.aspx
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Author Resource :
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Keywords :
Ptfe rod, teflon sheet,
Category :
Business
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Business
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