This part of ISO 10426 specifies requirements and gives recommendations for six classes of well cements,
including their chemical and physical requirements and procedures for physical testing.
This part of ISO 10426 is applicable to well cement classes A, B, C and D, which are the products obtained by
grinding Portland cement clinker and, if needed, calcium sulfate as an interground additive. Processing
additives can be used in the manufacture of cement of these classes. Suitable set-modifying agents can be
interground or blended during manufacture of class D cement.
This part of ISO 10426 is also applicable to well cement classes G and H, which are the products obtained by
grinding clinker with no additives other than one or more forms of calcium sulfate, water or chemical additives
as required for chromium (VI) reduction.