| Viscosity | High |
Drilling-grade bentonite is naturally occurring clay containing the clay minerals. It can also contain
accessory minerals, such as quartz, mica, feldspar and calcite.
Drilling-grade bentonite shall be deemed to meet the requirements of this International Standard if a
composite sample representing no more than one day's production conforms to the sical
specifications of Table 8, represents the product produced and is controlled by the manufacturer
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