ISO 10426-4:2004

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Petroleum and natural gas industries — Cements and materials for well cementing — Part 4: Preparation and testing of foamed cement slurries at atmospheric pressure

ISO 10426-4:2004 is an international standard that specifies methods for preparing and testing "foamed cement slurries" at atmospheric pressure, used primarily in the petroleum and natural gas industry for well cementing operations; essentially defining procedures to create and analyze foamed cement mixtures used to seal a wellbore after drilling