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El-Amerria (Alexandria, Egypt). Acrylonitrile butadiene copolymer (NBR) from Bayer AG, Germany with 32% acrylonitrile content and specific gravity 1.17±0.005 at room temperature was used. Tetrahydrofuran (THF) and chloroform were reagent grade from Merck, Darmstadt, Germany. High performance motor oil was supplied by ExxonMobil Egypt. The fine grade of copper with average particle size varies between 60–75 nm was obtained from BDH chemicals Ltd, Poole, England. Nanographite powder produced by chemical disintegration of graphite with average particle size 40 nm supplied by Nanjing Emperor Nano Mateial Co., Ltd, China.