However, open systems involve a very labor-intensive process. In general, thermoplastics offer the opportunity to integrate extra components such as threaded mounting flanges or connectors into the design.

Volatile organic compound (VOC) emissions from the varnish are becoming an increasing problem for manufacturers. Since thermoplastics do not give off these VOCs, special exhaust systems are unnecessary. The high capital cost of trickle varnish equipment ($500k to $750k) can generally be eliminated. Additionally, thermoplastic encapsulation allows components to operate with a lower heat rise than under "open" construction.

Thermoplastic encapsulation tends to dampen motor and transformer vibration. Additionally, parts can be made smaller using thermoplastics. By encapsulating coil wound components with a thermally conductive thermoplastic, thermal rise can be reduced, giving reduced coil resistance, increased power or torque, increased component life, and opening further cost reduction possibilities. Thermoplastic components are more rugged and pass higher voltage withstand tests so they are safer in operation. Finally, depending upon the application, by reducing size and the total number of components, thermoplastics usually reduce the overall system cost.