Resin Transfer Molding

Developments in materials, machine and tooling technologies have enabled the RTM process to become highly efficient for both small and large components and short or long production runs.

The basic RTM process involves pre-loading a mould cavity with dry, continuous reinforcement, closing the cavity and injecting a catalysed resin. Once the resin has wet-out the reinforcement and has cured sufficiently, the cavity is opened and the part removed. RTM tools can be manufactured from composites or, for maximum durability, from metals. The tools may operate at room temperature or incorporate a heating system for optimum production.

The RTM process is now widely accepted in the composites industry as an effective method of manufacturing parts ranging from aerospace applications through to land transport, marine and building and construction. For RTM it is vital that the gel and cure characteristics of a resin can be tailored to suit particular mould cycle times.