ASTM D7977-23

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. Information regarding plant control and specification analysis can be found in test method D6367.
SCOPE
1.1 This test method covers the determination of the polymer content of AMS (α-Methylstyrene). 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 based on the data in Table 1. 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: Published
• Publication Date: 31-Mar-2023
• 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

Standards Content (Sample)

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.
Designation: D7977 − 23
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* D3437 Practice for Sampling and Handling Liquid Cyclic
Products
1.1 This test method covers the determination of the poly-
D6367 Specification for AMS (α-Methylstyrene)
mer content of AMS (α-Methylstyrene). Dimers and trimers are
D6809 Guide for Quality Control and Quality Assurance
not measured by these test methods.
Procedures for Aromatic Hydrocarbons and Related Ma-
1.2 This test method has been found applicable to determin-
terials
ing the polymer content of AMS in concentrations up to
E29 Practice for Using Significant Digits in Test Data to
15 mg ⁄kg with an LOQ of 0.6 mg/kg and an LOD of 0.2 mg/kg
Determine Conformance with Specifications
based on the data in Table 1. Samples containing more than 15
E691 Practice for Conducting an Interlaboratory Study to
mg/kg of polymer must be suitably diluted before measure-
Determine the Precision of a Test Method
ment. 3
2.2 Other Document:
1.3 In determining the conformance of the test results using OSHA Regulations, 29 CFR paragraphs 1910.1000 and
this method to applicable specifications, results shall be
1910.1200
rounded off in accordance with the rounding-off method of
TEST METHOD A—DETERMINATION OF POLYMER
Practice E29.
IN α-METHYLSTYRENE VIA
1.4 The values stated in SI units are to be regarded as
SPECTROPHOTOMETER
standard. No other units of measurement are included in this
standard.
3. Summary of Test Method
1.5 This standard does not purport to address all of the
3.1 This test method utilizes the fact that AMS polymers
safety concerns, if any, associated with its use. It is the
present in the monomers are insoluble in methanol. The
responsibility of the user of this standard to establish appro-
polymer content of AMS monomer is determined by measure-
priate safety, health, and environmental practices and deter-
ment of the degree of turbidity produced by the addition of dry
mine the applicability of regulatory limitations prior to use.
methanol to the AMS sample.
For specific hazard statements, see Section 8.
1.6 This international standard was developed in accor- 4. Significance and Use
dance with internationally recognized principles on standard-
4.1 This test method can be used for determining polymer
ization established in the Decision on Principles for the
concentrations in AMS monomer.
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
Barriers to Trade (TBT) Committee.
4.3 This test method can be used for plant control and for
specification analysis. Information regarding plant control and
2. Referenced Documents
specification analysis can be found in test method D6367.
2
2.1 ASTM Standards:
5. Interferences
5.1 Small changes in turbidity may occur with time. It is,
1
These test methods are under the jurisdiction of ASTM Committee D16 on
therefore, important that the absorbance of calibration mixtures
Aromatic, Industrial, Specialty and Related Chemicals and is the direct responsi-
and samples be determined after standing the same length of
bility of Subcommittee D16.07 on Styrene, Ethylbenzene and C9 and C10 Aromatic
Hydrocarbons. time.
Current edition approved April 1, 2023. Published April 2023. Originally
5.2 Hexane is used for two reasons:
approved in 2014. Last previous edition approved in 2019 as D7977 – 19. DOI:
10.1520/D7977-23.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
3
contact ASTM Customer Service at [e-mail]. 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

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D7977 − 23
TABLE 1 Polymer Content (mg/kg)
8. Hazards
Repeatability Reproducibility
Average 8.1 AMS (α-Methylstyrene) monomer is flammable and
Material Limit Limit
X
polymerizes exother
...

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 − 19 D7977 − 23
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*
1.1 This test method covers the determination of the polymer content of AMS (α-Methystyrene).(α-Methylstyrene). 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 1515 mg
mg/kg ⁄kg with an LOQ of 0.6 mg/kg and an LOD of 0.2 mg/kg. mg/kg based on the data in Table 1. 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.
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
1
These test methods are under the jurisdiction of ASTM Committee D16 on 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 June 1, 2019April 1, 2023. Published June 2019April 2023. Originally approved in 2014. Last previous edition approved in 20142019 as
D7977 – 14.D7977 – 19. DOI: 10.1520/D7977-19.10.1520/D7977-23.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at [e-mail]. 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 − 23
TABLE 1 Polymer Content (mg/kg)
Repeatability Reproducibility
Average
Material Limit Limit
X
r R
Alpha methyl
0.56 0.04 1.55
styrene
Alpha methyl
1.12 0.16 0.51
styrene
Alpha methyl
1.89 0.24 0.69
styrene
Alpha methyl
3.77 0.10 0.61
styrene
Alpha methyl
8.4 0.27 2.57
styrene
Alpha methyl
15.14 0.62 1.65
styrene
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.
4.3 This test method can be used for plant control and for specification analysis. Info
...