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The Epic Interactive Encyclopedia 1996
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Epic Interactive Encyclopedia, The (1996)(Epic Marketing)[non-bootable].iso
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plastic
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1992-09-02
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731b
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20 lines
Plastic is any of the stable synthetic
materials that are fluid at some stage in
their manufacture, when they can be shaped,
and that later set to rigid or semi-rigid
solids. Plastics today are chiefly derived
from petroleum. Most are polymers, made up of
long chains of identical molecules. Processed
by extrusion, injection-moulding,
vacuum-forming and compression, plastics
emerge in consistencies ranging from hard and
inflexible to soft and rubbery. They replace
an increasing number of natural substances,
being lightweight, easy to clean, durable,
and capable of being rendered very strong,
eg: by the addition of carbon fibres, for
building aircraft and other engineering
projects.
Subject by: Vince Pike