3M(TM) Scotch-Weld(TM) Epoxy Potting Compound DP270 Black, 400 mL Duo-Pak, 6 per case An electrical grade two-part epoxy for potting and bonding electronic components, and is electrolytically non-corrosive to copper. It has a 1:1 mix ratio and is a non-exotherming, high flow, opaque black product with a 70 minute worklife.