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Materials Compatibility BOARD Military Study' The elastomer compatibility study was performed as recommended using ASTM D 471 and D 412. Three tensile bars of each material were place in sealed, glass containers and stored of 51.7°C (125*9 for 0, 22, 70 and 694 hours. Summary of Hardness and Swell Characteristics Material Comments Teflon Relatively no changes in hardness or swell Nylon 6/6 Relatively no changes in hardness or swell Nitrile Hardness was reduced approximately 20 percent; swell increased approximately 17 to 18 percent Viton A401-C Relatively no changes in hardness or swell Viton GI=LT Relatively no changes in hardness or swell Fluorosilicon Hardness is relatively unchanged; swell increased approximately 7 percent Polyurethane Hardness is relatively unchanged; swell increased approximately 6 percent Polypropylene Hardness was reduced approximately 10 percent; swell increased from 8 to 15 percent The effect of B20 on vulnerable materials is diluted compared to higher blends. Some slow oxidation can occur, although it may take longer to materialize. Biodiesel also can affect some seals, gaskets, and adhesives, particularly those made before 1993 and those made from natural or nitrile rubber. It is primarily for these reasons that vehicle and storage equipment are modified. Most engines made after 1994 have been constructed with gaskets and seals that are generally biodiesel resistant. Earlier engine models or rebuilds may use older gasket and seal materials and present a risk of swelling, leaking, or failure. Fuel pumps may contain rubber valves that may fail. The typical approach is to create a maintenance schedule that checks for potential failures. Users can also contact engine manufacturers for more information. E. A.Frame, G.B. Bessee and H.W. Marbach, Biodiesel Fuel Technology for Military Application, U.S. Army TARDEC Fuels and Lubricants Research Facility,Southwest Research Institute, Interim Report TFLRP No.317, December 1997. 2