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About This Item


Full Description

This International Standard covers physical properties and test procedures for materials manufactured for use in oil-and gas-well drilling fluids. The materials covered are barite, haematite, bentonite, nontreated bentonite, OCMA grade bentonite, attapulgite, sepiolite, technical grade low-viscosity carboxymethylcellulose (CMC-LVT), technical grade high-viscosity carboxymethylcellulose (CMC-HVT), and starch. This International Standard is intended for the use of manufacturers of named products.

This edition of API Spec 13A is a modified adoption of ISO 13500 and includes the addition of an API Monogram Annex.

Document History

  1. API Spec 13A

    Specification for Drilling Fluid Materials, Eighteenth Edition, Includes Errata

    • Most Recent
  2. API Spec 13A

    Specification for Drilling-Fluid Materials, Seventeenth Edition, Includes Errata (2008)

    • Historical Version
  3. API 13A


    Specification for Drilling-Fluid Materials, Sixteenth Edition and ISO 13500:1998 (Modified) Petroleum and Natural Gas Industries - Drilling Fluid Materials-Specification and Tests

    • Historical Version
  4. API 13A

    Drilling-Fluid Materials

    • Historical Version