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Thermoplastic Encapsulation vs. Thermoset Encapsulation
A second type of encapsulation system
consists of overmolding componentry with thermoset polymers. These materials
offer good thermal capability and outstanding electrical insulation properties,
but the products have certain physical property limitations.
In general, thermoplastics offer a lower
total system cost than thermosets. Thermoplastics have higher tensile
strength and elongation so additional components can be integrated into
the design. Other benefits include greater impact strength and better
thermal cycle resistance. With thermoplastics, the removal of flash is
unnecessary and parts can be colored for easy part identification. Thermoplastic
encapsulation systems have been granted UL and IEC ratings through Class
H, something no thermoset provides.
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