Document O1gONRdjr8xZD9EbYKwOjbGpX

*' United States Patent 4,217,255 TEST RESULTS-EXAMPLE MIXES Static Wear Loss Drag Tests Stop Distances Coeff of (in sup 3) Light Heavy Light Heavy Mix Friction Drag/Stops Drag Drag BSL BSL A 347 B 514 C 570 D 480 E 390 F 563 G 515 H 397 J 597 L 494 M 457 N 544 16/ 33 P P P P 09/ 33 P P P P 11/ 26 P P P P 23/ 56 P P P P 17/ 57 P P P P 33/ 18 P P P P 11/ 33 P P P P 23/ 56 P P P P 10/ 32 P P P P 17/1 03 P P P P 15/ 59 P P P P 12/ 31 P P P P Page 9 of 9 All of the above mixes passed all of the A A R performance tests, with the exception of Mix A which exhibited slightly low coefficients of friction Mix L showed a relatively high wear rate, although within ^he AAR standards It can be seen from the above test results that friction matenals made from compositions including vanous synthetic fibers along, in combination with other synthetic fiber, or in combination with cellulose fiber can meet ngorous AAR standards and exhibit low wear rates The best wear rates were exhibited by Mixes A, B, C, G and N, which contained from 1 61-3 19% of a single synthetic fiber, and by Mix J which contained a low total content fiber mixture of synthetic and cellulose fibers Overall fiber content ranged from 0 71% polyester (Mix E) to 9 56% glass and cellulose (Mix R) Binder content ranged from 16 90% (Mix N) to 19 74% (Mix F), while filler content was from 67 61% (Mix R) to 79.85% (Mix C) The amount and type of curative agents is mainly dependent on the amount and composition of the organic binder used In summation, I have discovered that composition friction matenals suitable for railroad use can be formulated, without the use of lead or asbestos, by using a relatively low content of various synthetic fibers alone, in combinations, or m combination with cellulose fiber if it k it k Images View Cart Add to Cart Prev List Hit List Next List Previous Next Top Home Quick Advanced Pat Num Help http //patft uspto gov/netacgi/nph-Parsei?Sectl=PT02&Sect2=HITOFF&u=/netahtml/sea 10/18/2003