Main Traits with High Density Polyethylene (HDPE)
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Posted On :
Aug-11-2011
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Article Word Count :
429
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HDPE is a type of thermoplastic resin with high crystallinity and non-polarity. Original HDPE appears dairy white and semi translucent in a tiny section to some degree.
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HDPE is a type 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 excellent resistance to most chemicals in life and market. Some types of chemicals will produce chemical erosion, like corrosive antioxidant (nitric acid), aromatic hydrocarbons (dimethyl benzene) and halogenating hydrocarbon (carbon tetrachloride). The polymer doesn't absorb moisture and has beneficial steam resistance, which can be applied for packaging. With very excellent electricity performance, particularly the strength of insulation and dielectric, HDPE is fairly applicable to create wire and cable. What's more, HDPE with medium to high molecular level possesses pretty superior impact resistance, even in low room temperature of 40 F.
Unique characteristic of several levels of HDPE may be the appropriate mixture of the following 4 basic variables: density, molecular weight, distribution of molecular weight and additives. Distinctive forms of additives are utilized within the production of polymers with special performance. As a result, these variables combine to generate HDPE with various levels and usages; the performance can be within the very best balance.
Density is the main variable that decides the characteristics of HDPE, while four variables mentioned play a role that influence one another. Ethylene is the primary raw material of polyethylene. Couple of other monomers, including l-fullerene and 1-essien, are also generally utilised to improve the performance of polymer. As for HDPE, the content of couple of monomers above is usually less than 1% to 2%. An added monomer to some extent reduces the crystallinity of polymer. This alter is frequently measured by density, though density and crystallization rate are in a linear rapport. Based on 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, at times MDPE is classified as ptfe rod or LLDPE.
Homo-polymer with the very best density along with the greatest stiffness has superior permeability control and the biggest melting point. But typically it has fairly poor cracking resistance to environmental tension (ESCR). In the similar time, ESCR is resistance of PE to cracking brought on by mechanical or chemical tension. Greater density normally improves the mechanical strength performance, for example tensile strength, stiffness and hardness. The main raw materials used to make teflon film. Thermal properties including softening point temperature and heat distortion temperature are enhanced; the permeability, like 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)_72995.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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