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Molded Urethane Terms
– Substance added to a polymer to increase
the effectiveness, but not the strength, of the polymer. Examples of
additives include flame-retardants, anti-static compounds, pigments and
lubricants.
– A discoloration of the surface of a polyurethane product—not
to be confused with dust from external sources—caused by the migration
of a liquid or solid to the surface.
– Foam producing substance (e.g. carbon dioxide).
– The point of tension at which polyurethane
will rupture.
– A polymer made up of two monomers in which each repeating
unit in the chain consists of units of both monomers.
– The chemical linkage of polymeric chains that results
in a three-dimensional network of polymers. Crosslinked polymers possess
greater strength and durability than linear polymers do.
– The amount of time necessary to complete a molding
cycle from mold preparation to demolding.
– A device placed within a mold that prevents the flow of material
into cavities of the mold in order to reduce, alter or eliminate a part
of the cast for which the mold was initially designed.
– The amount of time that passes between the dispensation
of liquid components into the mold and the removal of the end product.
– Chemicals in
liquid or crystalline form used in the production of polyurethane adhesives,
coatings and foam.
– A
material capable of returning to its initial length after being stretched
at room temperature up to twice its original length.
– An ion, composed of one oxygen atom and one hydrogen
atom, used in bases, acids and alcohols.
– Energy loss in the form of heat that results from
the deformation of elastomeric material caused by the application of
stress.
– The forming of millimeter- or micron-sized parts
through the molding process. Micro molded parts, for which tolerances
must be extremely tight, are increasingly in demand by biomedical, pharmaceutical,
fiber-optic, electronics, telecommunications, office-automation, computer
and automotive industries.
– The most basic polymeric unit, usually a liquid or a
gas, consisting of molecules from the same organic substance.
– Two or more monomers bonded together in a chain through
a chemical reaction.
– The process in which a chemical reaction links
together monomers to form a polymer.
– A chemical compound composed of two or more hydroxyl groups
that, in conjunction with diisocyanate, are used in the production of
polyurethane foam.
– The comparison of the amount of energy needed to create
an elastic deformation and the amount of energy needed to recover from
such a deformation.
– Category of plastics that have the potential to
soften and reform when heated, hardening again when cooled. During the
process, the physical makeup of the thermoplastic does not change.
– Category of plastics that cannot be reformed upon reheating.
Thermosets remain permanently hard.
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