Nil-Cor is the pioneer and world leader in design, production and application of advanced composite valves manufactured from fiberglass and graphite reinforced resins. First introduced in 1977, Nil-Cor advanced composite valves have consistently proven their value in tough, highly corrosive fluids and environments. Nil-Cor graphite and fiberglass reinforced thermoset and thermoplastice resins provide outstanding resistance to acids, caustics, bleaches, solvents and over 1,000 other corrosive chemicals.