potting resin r-381-m thermal class b (130c) 2 comp. epoxy resin ul approved e229550 introduction r-381-m series potting resin are made from epoxy resin, hardener and filler presented in two-component form. wherein, r-381-1 is heating type product. r-381-3 cures at room temperature. they all have excellent fire resistance property. they have gained ul certification (e229550) and ul insulation system certification (e242776). features good manufacturability and insulation property, low shrinkage, shining appearance of condensate and excellent crack resistance. applications/use potting electronic components, motor and apparatus coils. for example: small transformer, instrument transformer coils, capacitor, ignition coils of autocycle and auto etc.