Character : The white amorphous powder , not smelly , non-toxic , the melting point approximately 2,825, the relative density 3.58 , soluble in acid or ammonium salt solution , insoluble in water , the ethanol , the benzene and toluene etc .

Use : As the vulcanization activator and active filler in the rubber industry , also is the polyphenylene oxide synthetic catalyst , the bond , the padding of the paint and of the paper .