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ranking
Ordering of laminates by strength,
stiffness or others.
reaction injection molding (RIM)
A
process for molding polyurethane, epoxy, and
other liquid chemical systems. Mixing of two to
four components in the proper chemical ratio is
accomplished by a high-pressure impingement-
type mixing head, from which the mixed mate-
rial is delivered into the mold at low pressure,
where it reacts (cures).
reinforced plastics
Molded,
formed
filament-wound, tape-wrapped, or shaped plastic
parts consisting of resins to which reinforcing fi-
bers, mats, fabrics, and so forth, have been added
before the forming operation to provide some
strength properties greatly superior to those of
the base resin.
resin
A solid or pseudosolid organic material,
usually of high molecular weight, that exhibits a
tendency to flow when subjected to stress. It
usually has a softening or melting range, and
fractures conchoidally. Most resins are poly-
mers. In reinforced plastics, the material used to
bind together the reinforcement material; the ma-
trix. See also polymer.
resin content
The amount of resin in a lami-
nate expressed as either a percentage of total
weight or total volume.
resin-rich area
Localized area filled with
resin and lacking reinforcing material.
resin-starved area
Localized area of insuffi-
cient resin, usually identified by low gloss, dry
spots, or fiber showing on the surface.
resin transfer molding (RTM)
A process
whereby catalyzed resin is transferred or injected
into an enclosed mold in which the fiberglass re-
inforcement has been placed.
roving
A number of yarns, strands, tows, or
ends collected into a parallel bundle with little or
no twist.
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