to about 40 percent by weight preferably from about 10 to about 35 percent by weight of the polymeric compositions are mixed into said composition improved fire retardance and other desirable characteristics can be provided by incorporating other adjuvants such as metallic compounds such as antimony tin zinc iron bismuth and arsenic compounds e g antimony oxide zinc oxide iron oxide and arsenic sulfide generally in the amount of about 1 to about 30 percent by weight and preferably from about 2 to 25 percent by weight of said polymeric composition the preferred metallic compounds are zinc oxide iron oxide and antimony oxide other adjuvants such as plasticizers mold release agents lubricants fillers dyestuffs and pigments may be included also the components comprising the compositions of this invention can be mixed by any of several well known methods the additives can be introduced into the polymer or its precurser s while the latter is dissolved in a suitable solvent this procedure is especially suitable when it is desired to incorporate the additives during the polymer manufacturing process when the polymer is subsequently recovered from the solvent the additives are intimately mixed with the polymer the additives may be mixed with the polymer in the finely divided state and the mixture dry blended so that an intimate mixture is obtained on molding milling or extrusion alternatively the additives may be mixed with the polymer in the molten state at temperatures which can range from the melting point to just below the decomposition temperature of the polymeric composition the following.