Primary Features of High Density Polyethylene (HDPE)8
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Posted On :
Aug-11-2011
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Article Word Count :
435
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HDPE is a type of thermoplastic resin with high crystallinity and non-polarity. Original HDPE appears milk white and semi translucent in a small section to some degree. PE has great resistance to most chemicals in life and business.
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HDPE is a type of thermoplastic resin with high crystallinity and non-polarity. Original HDPE appears milk white and semi translucent in a small section to some degree. PE has great resistance to most chemicals in life and business. Some kinds of chemicals will generate chemical erosion, which include corrosive antioxidant (nitric acid), aromatic hydrocarbons (dimethyl benzene) and halogenating hydrocarbon (carbon tetrachloride). The polymer doesn't absorb moisture and has superior steam resistance, which is often utilized for packaging. With fairly excellent electricity performance, in particular the strength of insulation and dielectric, HDPE is rather applicable to create wire and cable. What's a lot more, HDPE with medium to high molecular level possesses very superior impact resistance, even in low room temperature of 40 F.
Unique characteristic of various levels of HDPE will be the appropriate combination of the following 4 fundamental variables: density, molecular weight, distribution of molecular weight and additives. Distinctive types of additives are utilized within the production of polymers with special performance. Consequently, these variables combine to generate HDPE with various levels and usages; the performance might be within the finest balance.
Density is the primary variable that decides the characteristics of HDPE, while 4 variables mentioned play a role that influence each other. Ethylene is the primary raw material of polyethylene. Couple of other monomers, like l-fullerene and 1-essien, are also often utilized to strengthen the performance of polymer. As for HDPE, the content of couple of monomers above is normally less than 1% to 2%. An added monomer a little bit reduces the crystallinity of polymer. This change is in most cases measured by density, when density and crystallization rate are in a linear relationship. In accordance with regulations of ASTM D1248, the United States typically 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, in some cases MDPE is classified as ptfe rod or LLDPE.
Homo-polymer with the very best density and the biggest stiffness has excellent permeability control and the biggest melting point. But usually it has very poor cracking resistance to environmental anxiety (ESCR). In the identical time, ESCR is resistance of PE to cracking brought on by mechanical or chemical tension. Higher density commonly improves the mechanical strength performance, such as tensile strength, stiffness and hardness. The main raw materials used to make teflon film. Thermal properties for example 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_Primary Features of High Density Polyethylene (HDPE)8_73000.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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