ASTM D128-98

    Standard Test Methods for Analysis of Lubricating Grease


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    1. Scope

    1.1 These test methods for analysis cover greases of the conventional type which consist essentially of petroleum oil and soap. The constituents which can be determined are soap, unsaponifiable matter (petroleum oil, etc.), water, free alkalinity, free fatty acid, fat, glycerin, and insolubles.

    Note 1-Any of the test methods described herein are best used by an experienced grease analyst who may also be able to make appropriate adaptations of the techniques as occasion requires.

    1.2 A supplementary test method is provided in the Appendix. This test method is intended primarily for application to greases containing thickeners which are essentially insoluble in -hexane, and to greases which cannot be analyzed by conventional methods because of the presence of such constituents as nonpetroleum fluids or nonsoap-type thickeners, or both. In some cases, these constituents can react with strong acid or alkaline solutions.

    1.3 These test methods appear in the following order:

    Sections Ash Determination 7 to 11 Insolubles, Soap, Fat, Petroleum Oil, 12 to 20 and Unisponifiable Matter Free Alkali and Free Acid 21 to 23 Water 24 Glycerin (Quantitative) 25 to 29

    1.4 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. For hazard statements, see Notes 3 through 22.

    1.5 The values stated in SI units are to be considered the standard.


    2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.

    ASTM Standards

    D95 Test Method for Water in Petroleum Products and Bituminous Materials by Distillation

    D156 Test Method for Saybolt Color of Petroleum Products (Saybolt Chromometer Method)

    D217 Test Methods for Cone Penetration of Lubricating Grease

    D445 Test Method for Kinematic Viscosity of Transparent and Opaque Liquids (and Calculation of Dynamic Viscosity)

    D473 Test Method for Sediment in Crude Oils and Fuel Oils by the Extraction Method

    D804 Terminology Relating to Pine Chemicals, Including Tall Oil and Related Products

    D1078 Test Method for Distillation Range of Volatile Organic Liquids

    D1193 Specification for Reagent Water

    D1353 Test Method for Nonvolatile Matter in Volatile Solvents for Use in Paint, Varnish, Lacquer, and Related Products


    ICS Code

    ICS Number Code 75.100 (Lubricants, industrial oils and related products)

    UNSPSC Code

    UNSPSC Code 15121902(Grease)


    Referencing This Standard
    Link Here
    Link to Active (This link will always route to the current Active version of the standard.)

    DOI: 10.1520/D0128-98

    Citation Format

    ASTM D128-98, Standard Test Methods for Analysis of Lubricating Grease, ASTM International, West Conshohocken, PA, 1998, www.astm.org

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