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 TEGO® FOAMEX 805 N TEGO® FOAMEX 840 TEGO® FOAMEX 1488 TEGO® FOAMEX 845 AIRASE® 5355