ASTM D2121-07
Standard Test Methods for Polymer Content of Styrene Monomer and AMS (alpha-Methylstyrene)

Standard No.

ASTM D2121-07

Release Date

2007

Published By

American Society for Testing and Materials (ASTM)

Status

Be replaced

Replace By

ASTM D2121-15

Latest

ASTM D2121-23

Scope

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.

1.1 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.

ASTM D2121-07 Referenced Document

• ASTM D2827 Standard Specification for Styrene Monomer
• ASTM D3437 Standard Practice for Sampling and Handling Liquid Cyclic Products
• ASTM D6809 Standard Guide for Quality Control and Quality Assurance Procedures for Aromatic Hydrocarbons and Related Materials
• ASTM E29 Standard Practice for Using Significant Digits in Test Data to Determine Conformance with Specifications

ASTM D2121-07 history

• 2023 ASTM D2121-23 Standard Test Methods for Polymer Content of Styrene Monomer
• 2016 ASTM D2121-16 Standard Test Methods for Polymer Content of Styrene Monomer
• 2015 ASTM D2121-15 Standard Test Methods for Polymer Content of Styrene Monomer
• 2007 ASTM D2121-07 Standard Test Methods for Polymer Content of Styrene Monomer and AMS (alpha-Methylstyrene)
• 2000 ASTM D2121-00 Standard Test Methods for Polymer Content of Styrene Monomer and AMS (alpha-Methylstyrene)