The Resin Transfer Molding (RTM) Process

A Simple Explanation of the RTM Process and Benefits

fiberglass reinforced panels, fiber reinforced composite, frp board Resin Transfer Molding, is a low pressure, "closed mold" process. This means that RTM parts are made by injecting liquid resin and catalyst into a closed mold cavity containing dry fiber reinforcements. Some of the benefits of this type of fiberglass manufacturing include: fast cycle times, parts that can be produced to very close tolerances, parts that are smooth on both sides, and production rate capacity up to 10,000+ parts per year.  Glass fibre reinforced plastic is a great solution for applications where metal is currently used.

Other RTM benefits include:

The dry fiber reinforcements can be glass, carbon, or other specialized materials to meet your needs. These fiber materials can also be custom configured (preformed) to enhance the production speed and reduce labor costs. The liquid resin is also available with many options, including: polyester, epoxy, vinyl ester, and others. Pigments and fillers can also be added to suit your part requirements.

Please be sure to contact us if you believe the resin transfer moulding process could provide a solution to your needs. You may wish to review our Products page to see examples where RTM molding is an ideal choice. We will be glad to answer your questions about fiber reinforced composites and provide advice based on our many years of experience. We will even recommend alternatives if the RTM process is not your best solution.


MRM Industries Inc
1655 Industrial Drive
Owosso, Michigan 48867
Phone: 989.723.7443  €  Fax: 989.725.2328

Fiberglass mat used in RTM manufacturingRTM mold ready for resin injectionMachine control for RTM productionFinishing work on composite componentsAssembly and inspection of RTM molded componentsPolishing composite fiberglass componentsRobotic cutting on composites for precision

RTM Molded Composite Plastics

MRM Industries custom built, state-of-the-art RTM composite fiberglass manufacturing facilityMRM Industries - RTM composite manufacturer of custom componentsAbout MRM and the Resin Transfer Molding of composite componentsThe Resin Transfer Molding (RTM) process Products and components ideally suited for RTM manufacturingTooling for Resin Transfer Molding manufacturingMRM's Equipment List for RTM manufacturingContact MRM for questions about RTM Get a map to our RTM manufacturing location
MRM Industries Inc
1655 Industrial Drive
Owosso, Michigan 48867
Phone: 989.723.7443
Fax: 989.725.2328
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