Document gDyOv0VKLpw6EZ8DEJGeLnq5N

United States Patent 4,217,255 Page 5 of 9 Ik number of filler materials were used in varying combinations to produce the necessary low wear rate, Tiardness and high coefficient of friction The fillers used were cast iron grit, kyanite, cashew nut particles, red iron oxide (hematite), black iron oxide, powdered alumina, graphite, barytes, coke, kaolin, cryolite, carbon black and zinc powder. Examples of the mixes formulated and tested are shown below and denoted Mixes A-R The compositions of ingredients are expressed in weight percentages Weight % MIX A Glass Fiber Organic Binder rubber resin Curative Agents Filler Materials iron grit kyanite powdered alumina black iron oxide barytes coke MIX B Glass Fiber Organic Binder rubber resin Curative Agents Filler Materials iron grit kyanite powdered alumina graphite barytes coke cryolite MIX C Glass Fiber Organic Binder rubber resin Curative Agents Filler Materials iron grit kyanite powdered alumina graphite barytes coke cryolite MIX D Glass Fiber Organic Binder rubber resin 15 74 2 89 12 11 12 11 0 27 8 46 21 21 22 55 14 47 2 78 23 37 11 68 0 26 7 90 20 42 11 68 2.91 12 03 4 95 24 54 13 99 0 48 3 92 17 11 14 99 4 82 14 59 2 59 3 02 18 63 1 64 76 71 2 91 17.25 1 62 78 22 1.61 16 98 1 54 79 85 1 62 17 18 http //patft uspto gov/netacgi/nph-Parser9Sectl=PT02&Sect2=HITOFF&u=/netahtml/sea 10/18/2003