API Spec 13A: 1993 Drilling-Fluid Materials

American Petroleum Institute (API). Fifteenth Edition, May 1, 1993. 52p. This specification covers physical properties and test procedures for materials manufactured for use in oil well drilling fluids. The materials covered are barite, hematite, bentonite, nontreated bentonite, attapulgite, sepiolite, OCMA grade bentonite, technical-grade lowviscosity carboxymethylcellulose (CMC-LVT), technicalgrade high-viscosity carboxymethylcellulose (CMC-HVT),
and starch. This document is intended for the use of manufacturers of named products.