Resin Transfer Molding (RTM) is a low pressure, closed molding process which offers a dimensionally accurate and high quality surface finish composite molding, using liquid thermoset polymers reinforced with various forms of fiber reinforcements.
Typically polymers of Epoxy, Vinyl Ester, Methyl Methacrylate, Polyester or Phenolic are used with fiberglass reinforcement. Other reinforcements, are offered for more demanding applications such as Arimid, Carbon and Synthetic fibers either individually or in combination with each other.
The matrix selection of polymer and reinforcement dictates both molding material cost, as well as molding mechanical and surface finish performance. Along with the polymer and reinforcement the addition of mineral fillers may be added to enhance fire retardancy, flex modulus and surface finish.