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1.1 This test method provides an indirect measurement of the viscosity of clay slurries using a funnel (Marsh Funnel) and a graduated cup of specific dimensions. This test method provides a practical indicator of the viscosity on a routine basis. This test method has been modified from the API Recommended Practice 13B-2.
1.2 The result determined using the method is referred to as the Marsh Funnel Viscosity.
1.3 This test can be performed in the laboratory, or used in the field to assess the apparent viscosity of a clay slurry for quality control purposes. The most commonly used slurry is a bentonite clay slurry.
1.4 The values stated in either SI units or inch-pound units [given in brackets] are to be regarded separately as standard. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with the standard.
1.5 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.
D653 Terminology Relating to Soil, Rock, and Contained Fluids
D3740 Practice for Minimum Requirements for Agencies Engaged in Testing and/or Inspection of Soil and Rock as Used in Engineering Design and Construction
API DocumentAPI RP 13B-1 (R2016),
ICS Number Code 17.060 (Measurement of volume, mass, density, viscosity); 91.100.15 (Mineral materials and products)
UNSPSC Code 11111800(Clays); 30121901(Soil stabilizer)
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ASTM D6910 / D6910M-09, Standard Test Method for Marsh Funnel Viscosity of Clay Construction Slurries (Withdrawn 2018), ASTM International, West Conshohocken, PA, 2009, www.astm.orgBack to Top