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This specification covers glass hydrometers of various scale graduation systems, as required by the ASTM test methods in which they are used. Hydrometers shall be of the constant-mass, variable-displacement type. Hydrometers shall be made of glass, except for the scale, ballasting material, and the thermometric liquid of thermohydrometers. Material used for ballast shall be secured to the lower part of the body, and no loose material of any sort may be inside a hydrometer. The stem shall be uniform in cross section, with no perceptible irregularities. The preferred shapes for the bodies of hydrometers are presented. Graduation lines and inscriptions shall be in a permanent black marking material, such as India ink. All hydrometers shall be graduated to read correctly where the plane of the level liquid surface intersects the stem. The thermometer shall be of the mercury-in-glass type, unless otherwise specified. Hydrometers shall be inspected, tested, and standardized in accordance with the requirements prescribed.
This abstract is a brief summary of the referenced standard. It is informational only and not an official part of the standard; the full text of the standard itself must be referred to for its use and application. ASTM does not give any warranty express or implied or make any representation that the contents of this abstract are accurate, complete or up to date.
1.1 This specification covers glass hydrometers of various scale graduation systems, as required by the ASTM Test Methods in which they are used.
1.2 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.
1.3 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.
D3290 Specification for Bond and Ledger Papers for Permanent Records
E1 Specification for ASTM Liquid-in-Glass Thermometers
E77 Test Method for Inspection and Verification of Thermometers
E126 Test Method for Inspection, Calibration, and Verification of ASTM Hydrometers
E344 Terminology Relating to Thermometry and Hydrometry
E2251 Specification for Liquid-in-Glass ASTM Thermometers with Low-Hazard Precision Liquids
E2877 Guide for Digital Contact Thermometers
ICS Number Code 17.060 (Measurement of volume, mass, density, viscosity)
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ASTM E100-19, Standard Specification for ASTM Hydrometers, ASTM International, West Conshohocken, PA, 2019, www.astm.orgBack to Top