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Introduction:
Resin transfer molding (RTM) is a low pressure closed molding process for moderate volume production quantities, filling the gap between the slow, contact molding processes and the faster, compression molding process, which require higher tooling costs. Common matrix resins include polyester, vinyl ester, epoxy, and phenolics.
Process:
Continuous strand mats and woven reinforcement is laid up dry in the bottom mold half. Performed glass reinforcements are used for complex mold shapes. The mold is closed and clamped, and a low viscosity, catalyzed resin is pumped in, displacing the air through strategically located vents. A static mixer regulates the resin/hardener mix to a certain ratio. The mix is then injected at a low pressure of 5 psi (34.5 Mpa) into a mold. The resulting part is then cured at room temperature.
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