methylene 3 5 di tert butyl 4 hydroxyhydrocinnamate methane stabilizer and 1 part irgafos 168 tris 2 4 di tert butylphenyl phosphite stabilizer commercially available from ciba specialty chemicals corporation in table 4 the impact modifiers were kraton rp6912 styrene ethylene isoprene styrene tri block copolymer commercially available from shell chemical company and epm 306p random ethylene propylene copolymer having an ethylene content of 57 commercially available from the polysar rubber division of miles incorporated table 4______________________________________sample control 1 2______________________________________sulfur content ppm 0 200 400graft copolymer 1 wt 34 9graft copolymer 2 wt 34 9graft copolymer 3 wt 34 9bmwd pp wt 34 9 34 9 34 9kraton rp 69l2 wt 15 0 15 0 15 0epm 306p wt 15 0 15 0 15 0irganox b225 wt 0 2 0 2 0 2calcium stearate wt 0 1 0 1 0 1______________________________________ the compounded samples were dried at 80 u00b0 c for at least 4 hours prior to molding to remove moisture one inch u00d7 1 8 34 test bars were used for all of the physical property measurements test bars were produced on a 5 oz battenfeld injection molding machine at a barrel temperature of 450 u00b0 f and a mold temperature of 130 u00b0 f the results of the.