Free-flowing thermosets are supplied in granulated pellet shape. The most important free-flowing thermosets are:
- Epoxy-resin systems (EP)
- Phenol-formaldehyde resin systems (PF)
- Melamine-formaldehyde resin systems (MF)
- Unsaturated polyester resin systems (UP)
The great advantage in processing is that the material can be conveyed via a conventional material feed system as in the case of thermoplasts.
- Good dimensional stability
- High continuous operating temperature
- Good chemical resistance
- Good mechanical properties
- Efficient cost-performance ratio
- Good electrical properties
- Fully developed machine and process technology
Compared to the processing of thermoplasts, the processing of thermosets differs by the temperature control unit on the cylinder and at the mould. The temperatures in the plasticating cylinder usually range from 60°C to 100°C in order not to accelerate the cross-linking reaction. For this purpose, a special thermoplastic cylinder is required for temperature control using liquid chemical agents. The temperatures in the mould are increased to a range of 140°C to 200°C by means of an integrated electrical mould heating unit to sharply accelerate the cross-linking process and to quickly reach the dimensionally stable state.