... is copolymer of vinyl chloride and vinyl isobutyl ether .The vinyl isobutyl ether offers the product good link function. SMP-25 ... ’t easily turn yellow or pulverized. The existence of ether bond gives the molecules good internal plasticization. So the ... soluble in aromatic and chlorinated hydrocarbons, ester, ketone, glycol ether acetates, and some glycol ether. SMP-45 also can be dissolved in 20% ...