Plastisol Coating
Plastisol coating is the most popular plastic material used for dip molding. As an alternative to polyethylene and polyurethane, this vinyl based mixture of resin and plasticizer melts easily and stays in molten form in room temperature. It provides noise and vibration dampening, thermal and electrical insulation and forms a protective coating over sharp, harsh or rough metal parts, making them easier to grasp. Plate racks, playground equipment, exercise equipment, tool handles, gas pump handles, fences and grating are all often coated in plastisol. It is highly viscous and adds an attractive and smooth finish to products made of any metal, even when galvanized, glass and some plastics.
Before products are dipped in molten plastisol coating they must first be thoroughly cleaned and treated with phosphate or chromate. A primer is then sprayed on, which increases adhesion. The products are then dipped into the liquid plastisol tank; the longer they remain submerged, the thicker the coating. Standard plastisol colors are black, green and orange, but there are many more available for a slightly higher price. The dipped part is then baked for a short time and left to cool. When the plastisol is in solid form, it exhibits strength and good chemical resistance. The coating can have a glossy or matte finish, and a flat or grainy surface, depending on the application.