ASTM D2121 - 07

    Standard Test Methods for Polymer Content of Styrene Monomer and AMS (alpha-Methylstyrene)

    Active Standard ASTM D2121 | Developed by Subcommittee: D16.07

    Book of Standards Volume: 06.04


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    Significance and Use

    This test method can be used for determining polymer concentrations in styrene monomer or AMS.

    This test method will not detect dimers and trimers.

    This test method can be used for plant control and for specification analysis.

    1. Scope

    1.1 These test methods cover the determination of the polymer content of styrene monomer and AMS (-Methylstyrene). It should be noted, however, that dimers and trimers are not measured by these test methods.

    1.2 Test Method A which is based on the use of a spectrophotometer or photometer, is intended for the quantitative determination of the polymer content of styrene monomer or AMS in concentrations up to 15 mg/kg. Samples containing more than 15 mg/kg of polymer must be suitably diluted before measurement.

    1.3 Test Method B is a rapid visual procedure that is intended for the approximate evaluation of polymer to a maximum concentration of 1.0 weight %. Samples having a polymer content of 1.0 weight % or greater should be suitably diluted prior to measurement.

    1.4 In determining the conformance of the test results using this method to applicable specifications, results shall be rounded off in accordance with the rounding-off method of Practice E 29.

    1.5 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.

    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.


    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

    D2827 Specification for Styrene Monomer

    D3437 Practice for Sampling and Handling Liquid Cyclic Products

    D6809 Guide for Quality Control and Quality Assurance Procedures for Aromatic Hydrocarbons and Related Materials

    E29 Practice for Using Significant Digits in Test Data to Determine Conformance with Specifications


    ICS Code

    ICS Number Code 71.080.15 (Aromatic hydrocarbons)

    UNSPSC Code

    UNSPSC Code 12352005(Aromatic or heterocyclic compounds)


    DOI: 10.1520/D2121-07

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