Puyang Hengfeng Electronic Insulation Materials Co., Ltd.mainly produces pyromellitic anhydride (pyrenetetracarboxylic dianhydride) with an annual production capacity of 2,200 tons. Pyromellitic anhydride (pyrenetetracarboxylic dianhydride), used in new insulating materials, with high temperature resistance, cold resistance, impact resistance and excellent electrical properties. Can be made into film, fiber, enameled wire, impregnated wire.