Resin Transfer Molding (RTM)

Resin Transfer Molding (RTM) is a multi-staged closed-mould process for mass production - 100 to 500+ units/year - of high-quality composite fiberglass or fiber-reinforced plastic (FRP) parts. RTM involves placing a fiber preform in a matched mould tool, then injecting a thermosetting resin matrix into the closed mould cavity at low pressure. Once cured, the mould is opened and the part removed. Click here to view "Light RTM Manufacturing Process" video.
Light RTM has taken the lead as the most popular closed moulding process for low to medium volume applications such as Marine, Automotive, Industrial, Wind Power and Medical composite moulding applications; applications which require two finished sides and close dimensional tolerances.

FormaShape has been a pioneer in the advancement and application of the Light RTM process. In the past 5 years, we have converted to Light RTM on over 80% of our annual fiberglass production (approximately 750,000 sq. feet). Closed moulded fabrication through RTM offers a number of advantages.

RTM Advantages

  • Superior design flexibility to create complex shapes and forms, including compound curves.
  • Excellent, uniform dimensional tolerance: +/- 1.0mm or 1/16"
  • High fiber content - 25% to 50% fiber content by volume - creates a strong and light-weight finished product.
  • Molded inserts, fittings, cores, ribs, bosses, and reinforcements possible.
  • Low tooling fee reduces start-up costs and time-to-market.
  • High material recovery and improved labour efficiencies yield decreased component production costs.
  • Produces two finished sides, inside and out; Class A finish and multi-color capability.
  • Reduced material waste and overspray.

Additional Benefits

  • Tighter tolerances to design specifications.
  • Consistent part thickness.
  • Environmentally-friendly closed-mold process lessens styrene emissions.
  • Low emission working environment.
  • Improved employee morale and retention.
  • Short mould-cycle times increase production volumes: An estimated 300% to 400% increase in per square foot productivity over open mold!
Light RTM Process
Today, the industry direction is towards closed molding and especially that of Light RTM. If your current fabrication can benefit from the adoption of Light RTM, contact us for our full range of Light RTM products and services including:
  • Light RTM Mold Fabrication
  • Plug and Glass Master Fabrication
  • Fiberglass Part Fabrication
  • Light RTM Training, Integration and Adoption

Learn more about our 5-Axis CNC Milling Machine

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