8820 High Temperature Rigid Urethane Kit 375mL

https://www.mgchemicals.com/products/potting-compounds/polyurethane-resins/black-potting-compound/

This black potting compound is a tough, 2-part high temperature urethane. It features a low mixed viscosity and properties similar to epoxy compounds, but with exceptional low temperature stability. It adheres strongly to a wide variety of substrates, including metals, composites, glass, ceramics, and many plastics.This urethane potting compound offers a high continuous operating temperature range, exceptional physical protection, and superior protection from acids, bases, and many organic solvents.

Features & Benefits
2:1 mix ratio
15 minute working life
48 hour cure at room temperature
Constant service temperature of -50 °C to 150 °C (-58 to 302 °F)
Low exotherm
Excellent dielectric properties