4221 is an available physical foaming of polyethylene. With the 4214B catalyst, 4226 nucleation masterbatch, through extrusion molding foam, can make the foam has good heat resistant performance and high temperature foam strength. Foam products suitable for use at high temperatures, bubble hole shrinkage deformation, and can be widely used for thermal insulation, sound absorption, need seismic situation. Material is non-toxic, tasteless and can be used for food packaging. Can also be used to the environmental conditions are harsh places ( such as oil, acid, alkali, temperature, moisture absorption, heat insulation ).