EVONIK CORPORATION › TEGO® FOAMEX 833 TEGO® FOAMEX 833 $0.00 TEGO® FOAMEX 833 is a compatible defoamer concentrate based on organic polymer technology. Free of silicone, solvent, and mineral oil. Quantity: Add To Cart Added! TEGO® FOAMEX 833 is a compatible defoamer concentrate based on organic polymer technology. Free of silicone, solvent, and mineral oil.