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ASTM D7977-19

(Test Method)

Standard Test Methods for Polymer Content of AMS (α-Methylstyrene)

Standard Test Methods for Polymer Content of AMS (α-Methylstyrene)

SIGNIFICANCE AND USE
4.1 This test method can be used for determining polymer concentrations in AMS monomer.  
4.2 This test method will not detect dimers and trimers.  
4.3 This test method can be used for plant control and for specification analysis.
SCOPE
1.1 This test method covers the determination of the polymer content of AMS (α-Methystyrene). Dimers and trimers are not measured by these test methods.  
1.2 This test method has been found applicable to determining the polymer content of AMS in concentrations up to 15 mg/kg with an LOQ of 0.6 mg/kg and an LOD of 0.2 mg/kg. Samples containing more than 15 mg/kg of polymer must be suitably diluted before measurement.  
1.3 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 E29.  
1.4 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.  
1.5 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use. For specific hazard statements, see Section 8.  
1.6 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

General Information

Status
Historical
Publication Date
31-May-2019
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

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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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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: D7977 − 19
Standard Test Methods for
1
Polymer Content of AMS (α-Methylstyrene)
This standard is issued under the fixed designation D7977; 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* D6367 Specification for AMS (α-Methylstyrene)
D6809 Guide for Quality Control and Quality Assurance
1.1 This test method covers the determination of the poly-
Procedures for Aromatic Hydrocarbons and Related Ma-
mer content of AMS (α-Methystyrene). Dimers and trimers are
terials
not measured by these test methods.
E29 Practice for Using Significant Digits in Test Data to
1.2 This test method has been found applicable to determin-
Determine Conformance with Specifications
ing the polymer content of AMS in concentrations up to 15
E691 Practice for Conducting an Interlaboratory Study to
mg/kg with an LOQ of 0.6 mg/kg and an LOD of 0.2 mg/kg.
Determine the Precision of a Test Method
Samples containing more than 15 mg/kg of polymer must be
3
2.2 Other Document:
suitably diluted before measurement.
OSHA Regulations, 29 CFR paragraphs 1910.1000 and
1.3 In determining the conformance of the test results using
1910.1200
this method to applicable specifications, results shall be
TEST METHOD A—DETERMINATION OF POLYMER
rounded off in accordance with the rounding-off method of
IN α-METHYLSTYRENE VIA
Practice E29.
SPECTROPHOTOMETER
1.4 The values stated in SI units are to be regarded as
standard. No other units of measurement are included in this
3. Summary of Test Method
standard.
3.1 This test method utilizes the fact that AMS polymers
1.5 This standard does not purport to address all of the
present in the monomers are insoluble in methanol. The
safety concerns, if any, associated with its use. It is the
polymer content of AMS monomer is determined by measure-
responsibility of the user of this standard to establish appro-
ment of the degree of turbidity produced by the addition of dry
priate safety, health, and environmental practices and deter-
methanol to the AMS sample.
mine the applicability of regulatory limitations prior to use.
For specific hazard statements, see Section 8.
4. Significance and Use
1.6 This international standard was developed in accor-
4.1 This test method can be used for determining polymer
dance with internationally recognized principles on standard-
concentrations in AMS monomer.
ization established in the Decision on Principles for the
Development of International Standards, Guides and Recom-
4.2 This test method will not detect dimers and trimers.
mendations issued by the World Trade Organization Technical
4.3 This test method can be used for plant control and for
Barriers to Trade (TBT) Committee.
specification analysis.
2. Referenced Documents
5. Interferences
2
2.1 ASTM Standards:
5.1 Small changes in turbidity may occur with time. It is,
D3437 Practice for Sampling and Handling Liquid Cyclic
therefore, important that the absorbance of calibration mixtures
Products
and samples be determined after standing the same length of
1
time.
These test methods are under the jurisdiction of ASTM Committee D16 on
Aromatic, Industrial, Specialty and Related Chemicals and is the direct responsi-
5.2 Hexane is used for two reasons:
bility of Subcommittee D16.07 on Styrene, Ethylbenzene and C9 and C10 Aromatic
5.2.1 To block out any color in the AMS, and
Hydrocarbons.
Current edition approved June 1, 2019. Published June 2019. Originally
5.2.2 To indicate high levels of dissolved water in the AMS.
approved in 2014. Last previous edition approved in 2014 as D7977 – 14. DOI:
10.1520/D7977-19.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
3
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM Available from U.S. Government Printing Office Superintendent of Documents,
Standards volume information, refer to the standard’s Document Summary page on 732 N. Capitol St., NW, Mail Stop: SDE, Washington, DC 20401, http://
the ASTM website. 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 ----------------------
D7977 − 19
5.3 Water content was found to have a slight impact on the 10. Calibration
measurement of polymer in AMS solution. When the water
10.1 Apparatus—Prepare and operate the spectrophotom-
concentration is below 260 ppm, its effect on the measurement
eter or photometer in accordance with the manufacturer’s
of polymer in AMS solution is negligible.
ins
...

This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation: D7977 − 14 D7977 − 19
Standard Test Methods for
1
Polymer Content of AMS (α-Methylstyrene)
This standard is issued under the fixed designation D7977; 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 Scope*
1.1 This test method covers the determination of the polymer content of AMS (α-Methystyrene). Dimers and trimers are not
measured by these test methods.
1.2 This test method has been found applicable to determining the polymer content of AMS in concentrations up to 15 mg/kg
with an LOQ of 0.6 mg/kg and an LOD of 0.2 mg/kg. Samples containing more than 15 mg/kg of polymer must be suitably diluted
before measurement.
1.3 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 E29.
1.4 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
1.5 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 safety, health, and healthenvironmental practices and determine the
applicability of regulatory limitations prior to use. For specific hazard statements, see Section 8.
1.6 This international standard was developed in accordance with internationally recognized principles on standardization
established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued
by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
2. Referenced Documents
2
2.1 ASTM Standards:
D3437 Practice for Sampling and Handling Liquid Cyclic Products
D6367 Specification for AMS (α-Methylstyrene)
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
E691 Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method
3
2.2 Other Document:
OSHA Regulations, 29 CFR paragraphs 1910.1000 and 1910.1200
TEST METHOD A—DETERMINATION OF POLYMER IN α-METHYLSTYRENE VIA SPECTROPHOTOMETER
3. Summary of Test Method
3.1 This test method utilizes the fact that AMS polymers present in the monomers are insoluble in methanol. The polymer
content of AMS monomer is determined by measurement of the degree of turbidity produced by the addition of dry methanol to
the AMS sample.
4. Significance and Use
4.1 This test method can be used for determining polymer concentrations in AMS monomer.
4.2 This test method will not detect dimers and trimers.
1
These test methods are under the jurisdiction of ASTM Committee D16 on Aromatic Hydrocarbons Aromatic, Industrial, Specialty and Related Chemicals and is the
direct responsibility of Subcommittee D16.07 on Styrene, Ethylbenzene and C9 and C10 Aromatic Hydrocarbons.
Current edition approved Dec. 1, 2014June 1, 2019. Published March 2015June 2019. Originally approved in 2014. Last previous edition approved in 2014 as D7977 – 14.
DOI: 10.1520/D7977-14.10.1520/D7977-19.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
3
Available from U.S. Government Printing Office Superintendent of Documents, 732 N. Capitol St., NW, Mail Stop: SDE, Washington, DC 20401, http://
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 ----------------------
D7977 − 19
4.3 This test method can be used for plant control and for specification analysis.
5. Interferences
5.1 Small changes in turbidity may occur with time. It is, therefore, important that the absorbance of calibration mixtures and
samples be determined after standing the same length of time.
5.2 Hexane is used for two reasons:
5.2.1 To block out any color in the AMS, and
5.2.2 To indicate high levels of dissolved water in the AMS.
5.3 Wa
...

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