Peroxide,1,1-dimethylethyl 1-methyl-1-[3-(1-methyl ethenyl) phenyl]ethyl;1-(2-tert-butylperoxy isopropyl)-3-isopropenylbenzene (not more than 77%, and diluent type A not less than 23%);1-(1-methyl-1-tert-butylperoxyethyl)-3-isopropenylbenzene;Peroxide,1,1-dimethylethyl 1-methyl-1-[3-(1-methyl ethenyl)phenyl]ethyl