... cracking and popping. PPH can substitute for Isophorone, anone, dibasic ester, benzyl alcohol, ethylene glycol ether, other propylene glycol ether, etc ... speaking, PPH is added 3.5~6% in purified acrylic ester photopolymer emulsions, 2.5~4.5% in vinyl acetate- ... acrylic ester emulsions, 2~4% in styrene - acrylic ester copolymer emulsions. Packing & storage200kg plastic drum. ...