Castrol Antifoam™ S 105 is a siloxane based antifoam additive especially developed for water based metalworking fluids. It is optimised for stability and compatibility as an effective tank-side additive for both single sump machines as well as central systems. It is especially useful where fast and immediate foam control is required. Castrol Antifoam S 105 can be used in all water based metal working fluids where conditions of severe agitation have created unacceptable foam levels. It provides a rapid defoaming action with a high degree of stability. Repeated use may be required for long term effect.