A new Class-H thermally stable casting resin for large molds

In order to reduce the size and volume of electrical machinery and to improve its reliability, further improvement in the heat resistant property of casting resins for large molds has been required. The heat resistance of the conventional casting resins is, however, limited to Class-B or Class F due to the balancing needs for heat resistance with resistance to heat-shock. We have successfully developed a unique new casting resin which has Class-H heat resistance and resistance to heat-shock higher than the conventional resins. This new resin is actually being applied to Class-H resin molded transformers and other electrical machinery.