Nitrile is a material commonly used in O-rings, and test results shown below indicate the advantages of the sample over pure nitrile.______________________________________ Abrasion 0% 20% 40% Resistance Powdered Powdered Powdered (% weight loss) Metal-Nickel Metal-Nickel Metal-Nickel ______________________________________ 2,000 cycles 10.42% 4.70% 3.70% 4,000 cycles 31.8% 11.8% 8.4% Hardness 89A 9