EVONIK CORPORATION › TEGO® FOAMEX 825 TEGO® FOAMEX 825 $0.00 TEGO® FOAMEX 825 is a compatible defoamer emulsion based on polyether siloxane technology. Good balance of effectiveness and compatibility. Add To Cart Added! TEGO® FOAMEX 825 is a compatible defoamer emulsion based on polyether siloxane technology. Good balance of effectiveness and compatibility. You Might Also Like AIRASE® 5100 TEGO® FOAMEX 26 TEGO® FOAMEX 800 TEGO® FOAMEX 842 TEGO® FOAMEX 840