Plastic Properties of High Density Polyethylene (HDPE)
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:
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HDPE Quick Facts:
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Excellent resistance (no attack) to dilute and concentrated Acids, Alcohols and Bases
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• Max Temp: 248°F 120°C
• Min Temp: -148°F -100°C
• Autoclavable: No
• Melting Point: 266°F 130°C
• Tensile Strength: 4,550 psi
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• Hardness: SD65
• UV Resistance: Poor
• Translucent
• Rigid
• Specific Gravity: 0.95 |
Good resistance (minor attack) to Aldehydes, Esters, Aliphatic and Aromatic Hydrocarbons, Ketones and Mineral and Vegetable Oils
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Limited resistance (moderate attack and suitable for short term use only) to Halogenated Hydrocarbons and Oxidizing Agents.
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| HDPE Fabrication: |
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Additional Information:
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• Excellent for many food related products, FDA, NSF, and USDA approved for direct contact (depending on grade of material). 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.
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• Chemical Properties A-F
• Chemical Properties G-Z
• Physical Properties
• Use and Care of Plastics
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