HANAST HN-5508 A/B High Temperature Black Epoxy Potting Compound for Downhole, Power Module and Harsh-Environment Electronics Encapsulation HN-5508 A/B is a two-component, room-temperature or heat-curable epoxy potting compound engineered for high-temperature and harsh-environment electronics. Mixed at a 5:1 ratio by weight, it flows with low viscosity and a long pot life, penetrates narrow gaps, and cures bubble-free into a smooth, glossy, high-hardness (Shore D 85-95) black