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The first of the polyolefins, Low Density Polyethylene (LDPE) was
originally prepared some fifty years ago by the high pressure
polymerization of ethylene. Its comparatively low density arises from
the presence of a small amount of branching in the chain (on about 2% of
the carbon atoms). This gives a more open structure. Low Density
Polyethylene (LDPE) is a most useful and widely used plastic especially
in dispensing bottles or wash bottles. It is translucent to opaque,
robust enough to be virtually unbreakable and at the same time quite
flexible. Chemically LDPE is unreactive at room temperature although it
is slowly attacked by strong oxidizing agents and some solvents will
cause softening or swelling. It may be used at temperatures up to 95°
Celsius for short periods and at 80° Celsius continuously. LDPE is
ideally suited for a wide range of molded laboratory apparatus including
wash bottles, pipette washing equipment, general purpose tubing, bags
and small tanks.
LDPE Quick Facts:
Maximum Temperature: 176°F 80°C
Minimum Temperature: -58°F -50°C
Autoclavable: No
Melting Point: 248°F 120°C
Tensile Strength: 1700 psi
Hardness: SD55
UV Resistance: Poor
Translucent
Excellent flexibility
Specific Gravity: 0.92
LDPE Fabrication:
Weldable and machinable
Good for parts that require flexibility
Trays & containers
Food storage and laboratory
Corrosion resistant work surfaces
Very soft and pliable
LDPE Resistance:
Excellent resistance (no attack) to dilute and concentrated Acids,
Alcohols, Bases and Esters.
Good resistance (minor attack) to Aldehydes, Ketones and Vegetable Oils.
Limited resistance (moderate attack suitable for short term use only) to
Aliphatic and Aromatic Hydrocarbons, Mineral Oils and Oxidizing Agents.
Poor resistance and not recommended for use with Halogenated
Hydrocarbons.
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