A linear polymer, High Density Polyethylene (HDPE) is prepared from ethylene by a catalytic process. The absence of branching results in a more closely packed structure with a higher density and somewhat higher chemical resistance than LDPE. HDPE is also somewhat harder and more opaque and it can withstand rather higher temperatures (120° Celsius for short periods, 110° Celsius continuously). High density polyethylene lends itself particularly well to blow molding, e.g. for bottles, cutting boards, dipping baskets, dippers, trays and containers.
HDPE Resistance
- Excellent resistance (no attack) to dilute and concentrated Acids, Alcohols and Bases
- Good resistance (minor attack) to Aldehydes, Esters, Aliphatic and Aromatic Hydrocarbons, Ketones and Mineral and Vegetable Oils
- Limited resistance (moderate attack and suitable for short term use only) to Halogenated Hydrocarbons and Oxidizing Agents
HDPE Fabrication
- Excellent for any food related products, FDA, NSF, and USDA approved for direct contact. This material machines extremely well
- Good chemical resistance and high rigidity make it a good choice for trays and tanks
- Other uses include pipe fittings, wear plates, hinges and cutting boards
- Good impact resistance, light weight, very low moisture absorption, and high tensile strength. Not a good candidate for gluing. Mechanical fastening is one option, but preferably joined by hot air or nitrogen welding. Also, Ultrasonic, Laser, and infrared welding
Quick Facts
- Maximum Temperature : 248°F 120°C
- Minimum Temperature : 148°F -100°C
- Autoclavable : No
- Melting Point : 266°F 130°C
- Tensile Strength : 4550 psi
- Hardness : SD65
- V Resistance : Poor
- Translucent
- Specific Gravity : 0.95
Demanded For
- High stiffness
- Excellent mechanical properties
- Good dimensional stability
- High specific gravity