pounds of the feed material this fraction which contains 58 weight percent product 172 pounds of abs and pc is presently considered a product loss this fraction also contains 77 pounds of the heavily filled polymer and 49 pounds of other impurities depending on the compatibility of the heavily filled polymer with the product and the optimization of the froth flotation process the overall product recovery may be increased by recovering the product from this fraction the weights basis of 1000 pounds of the separated fractions from the four stage process are detailed in table 2 the light fraction reject 1 coming from flotation stage 15 may be treated as illustrated in fig2 this stream contains about 6 7 polyolefin fines and coming off of flotation tank 21 another 83 3 percent polystyrene coming off of flotation tank 22 greater than 98 pure and finally 8 3 abs greater than 98 pure coming from flotation tank 23 the remaining 1 2 being rejected rejects referring now to fig3 a two stage separation system is disclosed that can be used to recover products from feed material with a composition similar to the 1000 pound sample process b would consist of the final two stages of process a these two stages alone would produce an abs pc product with purity greater than 96 the recovery of the product for this process would only be 50 by weight of the abs and pc present in the feed stream in summary through the use of a two stage system we are able to produce a product of abs pc from the 1000 pound feed material that was greater than.