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Resin Transfer Molding (RTM)

September 13, 2017

RTM is another form of composite liquid molding. A catalyst or hardener is mixed with a resin and then injected into a mold. This mold contains fiberglass or other dry fibers which help to strengthen the composite.

RTM or Resin Transfer Molding is a closed mold process. In this process, matched male and female molds are being used. Before the process injection, fiber pre-form is placed in the mold cavity. Then the molds are clamped. Resin mix then is injected or transferred into the cavity through injection ports at a relatively low pressure.

Generally used for components with large surface areas or complex shapes. Recommended for products that require high strength-to-weight ratios. RTM parts have 2 finished surfaces with a high glass-to-resin ratio.

The RTM composite allows for complex forms and shapes such as compound curves. It is lightweight and extremely durable, with fiber loading ranging from 25-50%. of RTM consists of fiber content. Compared to other composites, RTM is relatively affordable to produce. This molding allows for finished sides both outside and inside with a multi-color capability.

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