HD.PE. sheet & PP sheet

[Characteristics of PE]

Polyethylene, a thermoplastic, was first discovered about 50 years ago. There are two types of polyethylene, low and high density. To produce low-density polyethylene, ethylene is first obtained by refining the gas. It is then compressed, peroxide is assed as a catalyst and chain modifier and hydrogen or carbon tetrachlorides are also added. Polymerization occurs at elevated temperature, after which the polymer is extruded in ribbon form, cooled and granulated. High-density polyethylene is obtained from gaseous ethylene fed into an inert hydrocarbon solvent with a catalyst. Polymerization occurs at atmospheric pressure and at moderate temperature. The slurry output is then dried and the polymer separated.

[Characteristics of polyethylene]

1. Mechanical properties: Good resistance to impact over wide temperature range (-40 - 90 ). Limitation is that it has lower creep resistance and inferior fatigue properties compared to polypropylene.
2. Environmental: Resistant to a wide range of chemicals, most inorganic acids and alkalis at room temperature. Good moisture resistance. Insoluble in organic solvents below 60 C but may be swollen. Limitations are that it is susceptible to weathering, UV light and environmental stress-cracking. Alloying of PE with butyl rubber and EPDM improves environmental stress-cracking resistance. Low resistance to permeation by gases and vapors (although HDPE is superior to polypropylene). Attacked by strong oxidizing acids. Dissolves in common solvents above 60 C.
3. Thermal properties: Limitation due to very high thermal expansion. Poor temperature capability.
4. Food and medicine: Non-toxic grades available for use with food stuffs.
5. Electrical properties: Good electrical properties- not appreciably affected by humidity due to low wear absorption. Power factor virtually unaffected by frequency or temperature. Limitation is that power factor very sensitive to slight degrees of oxidation and to polar additives.

[Feature]

• Excellent anti-abrasion and impact strength
• Excellent in low temperature and chemical resistant
• Non-toxic material

[Application]

• Chemical tank & electronic resistant machine
• Cutting board $ chute line
• Various refrigerating machine