Delayed Curing Rubber Composition and Method

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A nitrile rubber based sealant system including seals a made from a unique delayed curing nitrite rubber composition. The composition has excellent storage ability in dry form which can be cured (vulcanized) as needed under and with the aid of varying field conditions. The seals provide superior leak seal suitable for sealing leaks in pipes, fittings, flanges and other structures and are made by heating delayed self curing nitrile rubber formulation comprised of a critically selected combination of components including specially preconditioned nitrile rubber, sulfur, accelerants, activators, fillers, plasticizers, flame retardant, antidegradant, metallic filaments and optionally, nanophase rare earth material. The invention is also a method of sealing leaking pipes, fittings and structures in which the composition is injected (extruded) into heated molds, where it is vulcanized (cured) without further additives, to form a hard, strong, durable chemical resistant seal that can be used to seal leaking pipes and structures without interruptions of flow or shut down of operations. The formulation has the advantage of wide temperature adaptability, wide medium resistance, injection manufacturability with excellent filling quality and sealing ability.