Introduction Impact modifiers for PVC is made by multistep emulsion polymerization of acrylic monomers process system.it is a good PVC impact modifier, with typical core-shell structure polymer, inside has a certain degree of crosslinking of butyl acrylate, This product is a non-toxic, non-corrosive powder, packaged in plastic woven bags, and is a non-dangerous product. It is transported and stored as a non-dangerous product. It is protected from direct sunlight and rain. The shelf life is one year. It can be used after the shelf life is passed.Wholesale Pvc Additive website:http://www.pvcchemical.com/pvc-additive/