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ASTM D2121-07

(Test Method)

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

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

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.
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.

General Information

Status
Historical
Publication Date
31-Dec-2006
ICS
71.080.15 - Aromatic hydrocarbons
Technical Committee
D16 - Aromatic, Industrial, Specialty and Related Chemicals
Drafting Committee
D16.07 - Styrene, Ethylbenzene and C9 and C10 Aromatic Hydrocarbons
Current Stage
Ref Project

Relations

Replaces
ASTM D2121-00 - Standard Test Methods for Polymer Content of Styrene Monomer and AMS (alpha-Methylstyrene)
Effective Date
01-Jan-2007
Replaced By
ASTM D2121-15 - Standard Test Methods for Polymer Content of Styrene Monomer
Effective Date
15-Mar-2015
Referred By
ASTM D4790-23 - Standard Terminology of Aromatic Hydrocarbons and Related Chemicals
Effective Date
01-Jan-2007
Referred By
ASTM D2827-19 - Standard Specification for Styrene Monomer
Effective Date
01-Jan-2007

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

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation: D2121 − 07
StandardTest Methods for
Polymer Content of Styrene Monomer and AMS
1
(α–Methylstyrene)
This standard is issued under the fixed designation D2121; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope* 2. Referenced Documents
2
1.1 These test methods cover the determination of the 2.1 ASTM Standards:
polymer content of styrene monomer and AMS D2827 Specification for Styrene Monomer
(α–Methylstyrene). It should be noted, however, that dimers D3437 Practice for Sampling and Handling Liquid Cyclic
and trimers are not measured by these test methods. Products
D6809 Guide for Quality Control and Quality Assurance
1.2 Test Method A, which is based on the use of a spectro-
Procedures for Aromatic Hydrocarbons and Related Ma-
photometer or photometer, is intended for the quantitative
terials
determination of the polymer content of styrene monomer or
E29 Practice for Using Significant Digits in Test Data to
AMS in concentrations up to 15 mg/kg. Samples containing
Determine Conformance with Specifications
morethan15mg/kgofpolymermustbesuitablydilutedbefore
2.2 Other Document:
measurement.
OSHA Regulations, 29CFR paragraphs 1910.1000 and
3
1.3 Test Method B is a rapid visual procedure that is
1910.1200
intended for the approximate evaluation of polymer to a
maximum concentration of 1.0 weight %. Samples having a TEST METHOD A—DETERMINATION OF POLYMER
polymer content of 1.0 weight % or greater should be suitably IN STYRENE MONOMER OR α–METHYLSTYRENE
diluted prior to measurement. PHOTOMETER METHOD
1.4 In determining the conformance of the test results using
3. Summary of Test Method
this method to applicable specifications, results shall be
3.1 This test method utilizes the fact that polymers present
rounded off in accordance with the rounding-off method of
in the monomers are insoluble in methanol. The polymer
Practice E29.
content of styrene monomer or AMS is determined by mea-
1.5 The values stated in SI units are to be regarded as
surement of the degree of turbidity produced by the addition of
standard. No other units of measurement are included in this
dry methanol to the styrene or AMS sample.
standard.
4. Significance and Use
1.6 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the 4.1 This test method can be used for determining polymer
concentrations in styrene monomer or AMS.
responsibility of the user of this standard to establish appro-
priate safety and health practices and determine the applica-
4.2 This test method will not detect dimers and trimers.
bility of regulatory limitations prior to use. For specific hazard
4.3 This test method can be used for plant control and for
statements, see Section 8.
specification analysis.
1 2
These test methods are under the jurisdiction of ASTM Committee D16 on For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Aromatic Hydrocarbons and Related Chemicals and are the direct responsibility of contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
Subcommittee D16.07 on Styrene, Ethylbenzene and C9 and C10 Aromatic Standards volume information, refer to the standard’s Document Summary page on
Hydrocarbons. the ASTM website.
3
Current edition approved Jan. 1, 2007. Published January 2007. Originally AvailablefromU.S.GovernmentPrintingOfficeSuperintendentofDocuments,
approved in 1962. Last previous edition approved in 2000 as D2121 – 00. DOI: 732 N. Capitol St., NW, Mail Stop: SDE, Washington, DC 20401, http://
10.1520/D2121-07. www.access.gpo.gov.
*A Summary of Changes section appears at the end of this standard
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

---------------------- Page: 1 ----------------------
D2121 − 07
5. Interferences 8. Hazards
8.1 Styrene monomer is flammable and polymerizes exo-
5.1 Small changes in turbidity may occur with time. It is,
thermically on contact with peroxides, mineral acids and
therefore,importantthattheabsorbanceofcalibrationmixtures
aluminum chloride.
and samples be determined after standing the same length of
time.
8.2 Styrenemonomerbothinliquidandvaporstate,whenin
sufficient concentrations, acts as an irritant to the eyes and
5.2 Hexane is used for two reasons:
respiratory tract.
5.2.1 To block out any color in the styrene or AMS, and
5.2.2 To indicate dissolved water in the styrene or AMS.
8.3 Consult current OSHA regulations, local regulations,
and suppliers’ Material Safety Data Sheets for all materials
6. Apparatus used in thes
...

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5.1 This test method can be used for determining polymer concentrations in styrene monomer.  
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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 mass %. Samples having a polymer content of 1.0 mass % or greater should be suitably diluted prior to measurement.  
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1.1 This specification covers a grade of o-xylene identified as ortho-Xylene 980.  
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SIGNIFICANCE AND USE
5.1 Determining the type and amount of hydrocarbon impurities remaining from the manufacture of toluene, mixed xylenes, p-xylene, o-xylene, ethylbenzene, benzene, and styrene used as chemical intermediates and solvents is often required. This test method is suitable for setting specifications and for use as an internal quality control tool where these products are produced or are used. Typical impurities are: alkanes containing 1 to 10 carbons atoms, benzene, toluene, ethylbenzene (EB), xylenes, and aromatic hydrocarbons containing nine carbon atoms or more.  
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Standard Specification for Cumene (Isopropylbenzene)

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This specification covers cumene (isopropylbenzene). Tests shall be performed to determine the requirements of cumene in accordance to the following test methods: purity; alpha-methylstrene, benzene, butylbenzenes, diisopropylbenzenes, ethylbenzene, phenols, n-propylbenzene, sulfur, bromine index, and appearance.
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5.1 This test method is suitable for setting specifications on the materials referenced in 1.2 and for use as an internal quality control tool where isopropylbenzene is produced or is used in a manufacturing process. It may also be used in development or research work involving isopropylbenzene.  
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Standard Test Methods for Polymer Content of AMS (α-Methylstyrene)

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5.1 This test method is suitable for setting specifications on the materials referenced in 1.1. It may also be used as an internal quality control tool and in development or research work.  
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1.1 This test method covers the determination of the acid wash color of benzene, toluene, xylenes, refined solvent naphthas, and similar industrial aromatic hydrocarbons.  
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Standard Test Method for Acidity of Benzene, Toluene, Xylenes, Solvent Naphthas, and Similar Industrial Aromatic Hydrocarbons

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5.1 This test method is suitable for setting specifications, for use as an internal quality control tool, and for use in development or research work on industrial aromatic hydrocarbons and related materials. This test method gives an indication of residual acidity and is a measure of the quality of the finished product. It is an indication of the tendency of the product to corrode equipment.
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