antioxidants fillers dyes and the like the various characteristics and properties mentioned in the preceding discussion and in the examples below were determined by the following procedures the quality of the plexifilamentary film fibril strands produced in the examples were rated subjectively a rating of 34 5 34 indicates that the strand had better fibrillation than is usually achieved in the commercial production of spunbonded sheet made from such flash spun polyethylene strands a rating of 4 34 indicates that the product was as good as commercially flash spun strands a rating of 34 3 34 indicates that the strands were not quite as good as the commercially flash spun strands a 34 2 34 indicates a very poorly fibrillated inadequate strand a 34 1 34 indicates no strand formation a rating of 34 3 34 is the minimum considered satisfactory for use in the process of the present invention the commercial strand product is produced from solutions of about 12 5 linear polyethylene in tichlorofluoromethane substantially as set forth in lee u s pat no 4 554 207 column 4 line 63 through column 5 line 10 which disclosure is hereby incorporated by reference the surface area of the plexifilamentary film fibril strand product is another measure of the degree and fineness of fibrillation of the flash spun product surface area is measured by the bet nitrogen absorption method of s brunauer p h emmett and e teller j am chem soc v 60 p 309 319 1938 and is reported as m 2 g tenacity of the flash spun strand is determined with an instron tensile testing.