a plasticized polyvinyl chloride composition and method for its preparation , the plasticized polyvinyl chloride composition comprising polyvinyl chloride and an organic phosphate selected from the group consisting of the phosphates of the formula x y po 4 , wherein x is 0 , 1 or 2 and y is 1 , 2 or 3 , x + y being 3 , and mixtures of said phosphates , the amount of said organic phosphates being within the range of 20 to 100 parts by weight per 100 parts by weight of polyvinyl chloride .