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This document specifies requirements and gives recommendations for 8 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. This part of ISO 10426 is also applicable to composite well cements classes K and L, which are the products obtained by intergrinding Portland cement clinker and one or more forms of CaSO4 with specified composite constituents, or by subsequent blending of separately produced Portland cement with separately processed specified composite constituents. This document is a supplement to API Spec 10A 25th edition (2019) and its Addendum 1 (November 2019) and Addendum 2 (August 2022), the requirements of which are applicable with the exceptions specified in this document.