Where seal integrity is paramount, such as gearboxes, lubrication, scavenge and fuel systems understanding the material increases efficient operations. Trelleborg Sealing Solutions engineered materials that meet the requirements of AMS 7379, the globally recognized specification for low temperature FKMs, such as temperatures below -40°F/ -40°C. VCT11 withstand effects of the aviation fuels as the antioxidants and additives can cause embrittlement and deterioration.