Cement slurries prepared for oilfield use when mixed on the fly or batch mixed normally will entrain air into the fluid resulting in a froth or foam that can seriously affect the quality of the slurry. The addition of entrained air can change the density of the fluid resulting in volume discrepancies and ultimately a reduction of the strength of the final product. To combat this phenomenon, additives termed “anti-foams have been developed to aid the removal of the air from the slurry.

Kaliber Chemicals has the following product(s) available:
AF10-CP – Highly efficient anti-foam additive for cement slurries.

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Research:
https://en.wikipedia.org/wiki/Defoamer