Certain types of chemicals can produce chemical corrosion, such as corrosive oxidants (concentrated nitric acid), aromatic hydrocarbons (xylene) and halogenated hydrocarbons (carbon tetrachloride). The polymer is non-hygroscopic and has good water vapor resistance and can be used for packaging applications. HDPE has good electrical properties, especially high dielectric strength, making it suitable for wire and cable. Medium to high molecular weight grades with excellent impact resistance, at room temperature even at -40 ° C low temperature are so, the unique characteristics of various grades of HDPE is the appropriate combination of four basic variables: density, molecular weight, molecular weight distribution and additives The Different catalysts are used to produce custom specialty polymers. These variables combine to produce different grades of HDPE grades; achieve the best balance in performance. Has good chemical stability, can resist most of the acid, alkali, organic solution and hot water erosion. Good electrical insulation.
Polyethylene sheet (HDPE board) melting point of about 130 ℃, the relative density of 0.941 ~ 0.960. It has good heat resistance and cold resistance, chemical stability, but also has a high rigidity and toughness, good mechanical strength. Dielectric properties, resistance to environmental stress cracking is also better. Melting temperature of 220 ~ 260C. For larger materials, the proposed melting temperature range between 200 ~ 250C.
Polyethylene board odorless, non-toxic, feel like wax, with excellent low temperature performance (minimum temperature up to -70 ~ -100 ℃), chemical stability, and resistance to the majority of acid and alkali erosion (intolerance with oxidation Nature of the acid), at room temperature insoluble in the general solvent, water absorption, electrical insulation performance; low density; good toughness (the same applies to low temperature conditions); good tensile; electrical and dielectric insulation is good; low water absorption; Water vapor permeability is low; good chemical stability; tensile; non-toxic harmless.
However, PE sheet is very sensitive to environmental stress (chemical and mechanical effects), poor heat aging resistance. So, polyethylene sheet recycling is very necessary.