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Urea-Formaldehyde Plastics
Characteristics.
Colour:
Good.
General Physical Properties:
Vary greatly depending on fillers, laminating materials, etc.
Hard and rigid. Scratch resistant.
Strong and tough if appropriate filler used.
Slight shrinkage may follow moulding.
Heavier than water. (S.G. 1.4 - 1.6)
Water:
Absorption takes place, with loss of dimensional stability and increase
in brittleness.
Heat:
Thermosetting, and do not soften.
Good stability to moderate temperatures and perform satisfactorily over
range -- 70°F - 170°F.
Darken and decompose at higher temperatures.
Burn with difficulty.
Solvents and Chemicals:
Good resistance to most solvents and common chemicals. Unaffected by
detergents, cleaning fluids (e.g. carbon tetrachloride), gasoline (petrol),
nail polish and remover, alcohol, oils, greases.
Light:
No effect.
Age:
Slight deterioration.
Electrical:
Good insulation with resistance to arcing. Electrical properties do not
deteriorate appreciably when moisture is absorbed.
Applications
Resins and syrup.
A range of materials is produced for many purposes.
Examples of Uses: Foundry core production; surface coatings; finishes
for textiles, paper, etc.; adhesives; lamination.
Moulding Materials.
A wide range of moulding powders is produced, in all shades including
white; translucent or opaque. Used for compression and transfer moulding.
Examples of Uses: Electrical equipment, e.g. plugs, switches, etc.;
buttons; cups, saucers and plates; toys; clocks; radio cabinets;
lighting fittings; kitchen equipment.
Laminated Materials.
Sheets and panels are made in a great variety of colours and patterns
from urea-formaldehyde resins and fabric, paper, wood veneer, etc.
Examples of Uses: Lighting fittings; building panels; signs.
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