MBS resins products are graft copolymers of methyl methacrylate(M),butadiene(B) and styrene. It is used for modified PVC to make it have special performances or improve its comprehensive performances. MBS resins have extensive applications and are almost used for all transparent PVC as impact modifier, such as PVC transparent bottles, transparent sheets and transparent films etc., and can also used for high impact opaque PVC products as tubular products and pipe fittings.