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R.I.M. (Reaction Injection Moulding) is a technique to produce plastic parts by low-pressure injection of thermoset
resins in moulds.
Different types of moulds are applicable, among which aluminium and resin moulds.
There are various approaches possible:
- Silicone moulds (25-50 shots)
- Hybrid moulds (50-100 shots) (silicone - epoxy)
- Epoxy moulds (100 to 300 shots)
- Thermoconditioned moulds with extended lifetime (up to 5000 shots) and improved part quality, but involving a longer lead time.
Two component materials are used, which polymerise through cross-linking after mixing. The most commonly used materials are
Polyurethanes and include high-density PU, temperature resistant PU, flame retardant PU, shock resistant PU,... In addition to
the high density PU's, it is also possible to mould foamed PU's suitable for the production of lightweight components with either
soft or hard skins. Finally, glass fibre materials can be included in the moulding, which increases a part's strength immensely.
These materials allow prototyping and small series production of lightweight and mechanically functional products, which is a
typical application in the automotive sector.
The production cycle time is relatively short allowing a throughput of about 50 parts per week (dependent on size and complexity).
R.I.M. products
have a good to excellent temperature resistance
have a high impact strength
can be painted to enhance appearance
can be flame retardant
can be foamed
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