Resin Formulators RF 1350 Mod 4 Part A, when used with RF1350 Part B (sold separately), forms a quick curing, natural colored urethane adhesive/potting system. The cured system has a shore A hardness between 60-65 and was developed for potting connectors or small electronic components were flexibility is needed. When cured, this urethane system produces a flexible elastomer with excellent toughness, high elongation, and has very good adhesive strength to a variety of plastics.