Methyl tetrahydrophthalic anhydride (MTHPA)
It's epoxy resin agent (hardener), widely used in casting, sealing, winding and bonding of electronic components, automobile parts, transformers, high voltage capacitors, mutual inductors, and the impregnation of electronic components, resistors, hybrid integrated circuits. Moreover, it is used for fiberglass irrigation pipes, oil pipes, water filter boxes, insulative bushing, insulated paint and so on.