Resin Transfer Moulding (RTM)
BFG International uses a variety of methods to produce FRP parts. Our experienced engineers will select the best method for your project based on factors such as production volume, parts dimensions, budget, and other requirements.
Our extensive experience with Resin Transfer Moulding (RTM) enables us to produce innovative and cost effective parts for our OEM customers, including Alstom and Bombardier Transportation.
The process is best suited for high precision parts where a two-sided finish is required, and for moderate production quantities, ranging from 100 to 7,000 parts per year.
Process
A layer of glass fibre reinforcement is placed in a closed mould, whose edges are sealed and clamped. The mould cavity is then set under vacuum and resin is injected under pressure to fill the mould completely, making sure that no air is trapped in the finished product. The cure cycle then starts by applying heat to the mould, and the resin forms a polymer to become a rigid, lightweight plastic. Gel coats can also be applied to the surface to deliver a durable, high quality finish.
Advantages
- Suitable for mass production processes
- Works with a range of fibre reinforcements
- High surface quality on both sides
- Low environmental impact
- Less material wastage
- Capable of producing large, complex structures and hollow shapes
- Supports inserts and reinforcements for greater strength
- Zero air entrapment
- Laminate thickness - 0.5mm to 90mm
Limitations
- The process is generally limited to smaller components
- Not suitable for parts with negative draft
- Part thickness is fixed at the time of mould construction
- Glass-resin ratios of less than 35%
Applications
We use RTM processes to create a range of high quality components including:
- Industrial furniture
- Boat hulls
- Wind turbine components
- Aerospace, rail and automotive parts
- Medical composites