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Tri-Seal is pumped ahead of cement as a pre-flush to prevent lost circulation and cement fallback. Tri-Seal leaks off into high permeability zones and reacts with the calcium components in formation waters and mud filtrate to form a stiff silica gel. This silica gel prevents cement from leaking off into the thief zone. Tri-Seal is available in three versions: Tri-Seal, Tri-Seal D, and Tri-Seal D Viscous.