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), starch, low-viscosity
polyanionic cellulose (PAC-LV), high-viscosity polyanionic cellulose (PAC-HV) and drilling-grade
Xanthomonas campestris (Xanthan gum). This International Standard is intended for the use of manufacturers
of named products.