ELASTOMER
A material which, at room temperature,
can be stretched
under low stress to at
least twice its original length and ,
upon
immediate release of the stress,
will return with force to its
approximate
original length.
INJECTION MOLDING
Injection
molding is a process in which
plastic is melted or plasticated, and
injected
into a mold. With thermoplastics the mold is
kept at a
temperature below the solidifying
point of the plastic, causing the
injected
polymer to freeze, thus forming the article.
After cooling, the
mold is opened and the
item is removed.
PLASTIC
(1) One of many high-polymeric substances,
including
both natural and synthetic products,
excluding the rubbers. At some stage in
its
manufacture, every plastic is capable of flowing,
under heat and
pressure if necessary, into the
desired final shape. (2) Made of plastic;
capable of flow under pressure or tensile stress
.
Resins or plastics which, in their final state
as
final state as finished articles are
substantially infusible and
insoluble.
Thermosetting resins are often liquids at
some stage in their
manufacture or processing,
and are cured by heat, catalysis, or
other
chemical means, After being fully cured,
thermosets cannot be
resoftened by heating.