ASTM D5225 - 09

    Standard Test Method for Measuring Solution Viscosity of Polymers with a Differential Viscometer

    Active Standard ASTM D5225 | Developed by Subcommittee: D20.70

    Book of Standards Volume: 08.03


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    ASTM D5225

    Significance and Use

    Solution viscosity values for polymers are related to the average molecular size of that portion of the polymer which dissolves in the solvent.

    1. Scope

    1.1 This test method covers the determination of the solution viscosity of polymers using a differential or the modified differential viscometer. It is applicable to all polymers that dissolve completely without chemical reaction or degradation to form solutions that are stable with time and temperature. Results of the test are usually expressed as specific viscosity, intrinsic viscosity (limiting viscosity number), inherent viscosity (logarithmic viscosity number), or relative viscosity (viscosity ratio).

    1.2 Since there is more than one type of viscometer available to measure a differential pressure, follow the manufacturers directions applicable to the equipment being used.

    1.3 The solution viscosity values are comparable with those obtained using a glass capillary of Test Method D 2857. This test method differs from the glass capillary in that the solvent and the solution are compared at the same time that a test is run. With a glass capillary, each solution must be referenced back to the solvent run in the same capillary at the same temperature.

    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 specific hazard statements, see Section 8.

    Note 1—There is no known ISO equivalent to this test method.


    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

    D1243 Test Method for Dilute Solution Viscosity of Vinyl Chloride Polymers

    D2857 Practice for Dilute Solution Viscosity of Polymers

    E691 Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method


    UNSPSC Code

    UNSPSC Code 13100000(Rubber and elastomers)


    DOI: 10.1520/D5225-09

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