Under the term thermosets, thermosetting moulding compounds are to be understood. Contrary to thermoplasts, thermosets cannot be converted into the plastically deformable condition owing to the irreversible chemical cross-linking in the mould after the final curing.
In the last few years, thermosets have increased in importance thanks to their high heat resistance and chemical resistance as well as their good cost-performance ratio, frequently replacing other materials such as metals used for applications posing exacting requirements. A good example for this is applications in vehicle engine compartments such as turbocharger housings.
It makes sense to differentiate between the free-flowing and the non-free-flowing thermosets. Among the non-free-flowing thermosets, for the injection moulding process, above all, the reinforced unsaturated polyester bulk-moulding compounds, also known as BMCs, are of particular interest.