Resin 226 maintains good electrical properties in both wet and dry environments. It also has long-term heat stability and good toughness. Resin 226 is used for a wide range of electrical and electronic potting and casting applications. It is formulated with materials that have low volatility at room temperature, minimizing toxicity potential. The isocyanate used is not TDI, and does not contain MOCA. - 3M™ Scotchcast™ electrical resin 226 is a rubbery castor-based polyurethane that combines very low viscosity with a good workable pot life and a demold time, at room temperature, of as little as six hours.