Hand Lay-Up
One of the most basic of FRP manufacturing processes, Hand Lay-up involves applying
and forming each resin/glass laminate layer manually into an open mold until the desired
part thickness is achieved. Because of the close control of material application,
it is the method of choice for producing many fiberglass parts.
Spray-Up
In Spray-up manufacturing, a mixture of chopped glass fibers and resin is sprayed
onto a mold to form the part shape. Due to its high material application rate, spray-up
is an economical method for manufacturing certain fiberglass parts. Parts requiring
large area coverage, moderate strength and corrosion resistance as well as fast production
rates are produced using this Spray-up technique.
RTM
In Resin Transfer Molding (RTM), dry fiberglass reinforcement is first loaded into
a closed mold. Resin is then injected into the mold to form the finished part. Because
the material is completely enclosed within the mold in net or near-net shape, RTM
offers superior surface finishes, close control of tolerances and less material waste.
Compression Molding
Matched die molding of a premix paste of chopped glass reinforcement and resin is
called Compression Molding. This process is widely used to manufacture parts in situations
where large production quantities offset the method's increased cost of tooling.
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