Recommended Practice 10B-4 defines the methods for the generation and testing of foamed cement slurries and their corresponding unfoamed base cement slurries at atmospheric pressure.

This edition of API RP 10B-4 is the identical national adoption of ISO 10426-4, Petroleum and natural gas industries-Cements and materials for well cementing- Part 4: Preparation and testing of Foamed Cement Slurries at Atmospheric Pressure.