ASTM D6367-21
(Specification)Standard Specification for AMS (α-Methylstyrene)
Standard Specification for AMS (α-Methylstyrene)
ABSTRACT
This specification establishes the requirements for AMS (alpha-Methylstyrene). Sampled specimens shall conform to the following physical and chemical properties: minimum AMS content; maximum phenol content; maximum polymer content; inhibitor content; appearance; and color (Pt-Co units).
SCOPE
1.1 This specification covers AMS (α-Methylstyrene).
1.2 The following applies to all limits in this specification: for purposes of determining conformance with this specification, an observed value or a calculated value shall be rounded off “to the nearest unit” in the last right-hand digit used in expressing the specification limit, in accordance with the rounding-off method of Practice E29.
1.3 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
1.4 Consult current OSHA regulations, suppliers’ Safety Data Sheets, and local regulations for all materials used in this specification.
1.5 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-Oct-2021
- Technical Committee
- D16 - Aromatic, Industrial, Specialty and Related Chemicals
- Drafting Committee
- D16.07 - Styrene, Ethylbenzene and C9 and C10 Aromatic Hydrocarbons
Relations
- Effective Date
- 01-Nov-2023
- Effective Date
- 01-Jun-2017
- Effective Date
- 01-Apr-2017
- Effective Date
- 01-Jun-2016
- Effective Date
- 01-Jul-2015
- Effective Date
- 01-Jul-2015
- Effective Date
- 01-Jun-2015
- Effective Date
- 01-Jun-2015
- Effective Date
- 01-Dec-2014
- Effective Date
- 01-Jun-2013
- Effective Date
- 01-Dec-2012
- Effective Date
- 01-Mar-2012
- Effective Date
- 01-Jun-2011
- Effective Date
- 01-Jan-2011
- Effective Date
- 15-Jul-2010
Overview
ASTM D6367-21 is the recognized international standard specification for AMS (alpha-Methylstyrene), developed by ASTM International. This standard establishes clear requirements for the physical and chemical properties of AMS to ensure its quality and suitability for industrial use. Key elements include minimum content of alpha-Methylstyrene, limits on impurities, and other essential quality indicators such as inhibitor content, appearance, and color.
Alpha-Methylstyrene (AMS) is a valuable intermediate used in the chemical industry, particularly in the production of plastics, resins, and synthetic rubbers. Ensuring consistent quality through compliance with ASTM D6367-21 helps manufacturers and end-users maintain product safety and performance.
Key Topics
Quality Criteria: AMS must meet stringent requirements for:
- Minimum AMS content (at least 99.00% by mass)
- Maximum phenol content (20 mg/kg)
- Maximum polymer content (10 mg/kg)
- Inhibitor content (typically 10-20 mg/kg, often measured as para-tertiary-butyl catechol, TBC)
- Appearance (clear liquid, free from sediment and haze)
- Color (not exceeding 20 Pt-Co units)
Testing Methods: Compliance is determined using ASTM-approved test methods, such as:
- D6144 (Capillary Gas Chromatography for AMS content)
- D3160 (Phenol Content)
- D7977 (Polymer Content)
- D4590, D5386, D8005, E2680 (Inhibitor, Color, and Appearance)
Measurement Units: All specified values are stated in SI units, as required by international metrology best practices.
Conformity and Rounding: Results must be rounded off according to ASTM Practice E29, ensuring consistency in compliance assessment.
Safety and Compliance: The standard requires adherence to relevant OSHA regulations, suppliers’ Safety Data Sheets, and local safety guidelines when handling AMS and related chemicals.
Applications
Alpha-Methylstyrene that conforms to ASTM D6367-21 is utilized in various industry sectors, including:
- Plastics Manufacturing: High-purity AMS is a key monomer for specialty polymers and copolymers, impacting material performance and process stability.
- Resins and Adhesives: Quality-controlled AMS improves resin properties such as clarity, hardness, and thermal stability.
- Synthetic Rubber Production: AMS serves as an important co-monomer, contributing to the elasticity and durability of industrial rubbers.
- Chemical Synthesis: AMS is used as a building block for producing antioxidants, plasticizers, and other chemical intermediates where purity and inhibitor content are critical.
Adherence to ASTM D6367-21 ensures the AMS used in these applications meets rigorous purity and performance standards, protecting downstream processes and end-product quality.
Related Standards
For comprehensive quality assurance, ASTM D6367-21 references and aligns with several other important ASTM standards:
- ASTM D3437: Practice for Sampling and Handling Liquid Cyclic Products
- ASTM D4590: Test Method for Colorimetric Determination of p-tert-Butylcatechol in Styrene Monomer or AMS
- ASTM D5386 / D8005: Test Methods for Color of Clear Liquids
- ASTM D6144 / D7504: Methods for Analyzing AMS and Trace Impurities
- ASTM D7977: Test Methods for Polymer Content in AMS
- ASTM E29: Practice for Use of Significant Digits in Test Data
- ASTM E2680: Appearance Testing by Visual Inspection
Using ASTM D6367-21 in tandem with these related standards supports a robust and reliable quality assurance framework for alpha-Methylstyrene in global chemical supply chains.
Keywords: ASTM D6367-21, alpha-Methylstyrene, AMS specification, AMS testing, AMS purity, chemical standards, plastics, chemical industry compliance.
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Frequently Asked Questions
ASTM D6367-21 is a technical specification published by ASTM International. Its full title is "Standard Specification for AMS (α-Methylstyrene)". This standard covers: ABSTRACT This specification establishes the requirements for AMS (alpha-Methylstyrene). Sampled specimens shall conform to the following physical and chemical properties: minimum AMS content; maximum phenol content; maximum polymer content; inhibitor content; appearance; and color (Pt-Co units). SCOPE 1.1 This specification covers AMS (α-Methylstyrene). 1.2 The following applies to all limits in this specification: for purposes of determining conformance with this specification, an observed value or a calculated value shall be rounded off “to the nearest unit” in the last right-hand digit used in expressing the specification limit, in accordance with the rounding-off method of Practice E29. 1.3 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.4 Consult current OSHA regulations, suppliers’ Safety Data Sheets, and local regulations for all materials used in this specification. 1.5 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.
ABSTRACT This specification establishes the requirements for AMS (alpha-Methylstyrene). Sampled specimens shall conform to the following physical and chemical properties: minimum AMS content; maximum phenol content; maximum polymer content; inhibitor content; appearance; and color (Pt-Co units). SCOPE 1.1 This specification covers AMS (α-Methylstyrene). 1.2 The following applies to all limits in this specification: for purposes of determining conformance with this specification, an observed value or a calculated value shall be rounded off “to the nearest unit” in the last right-hand digit used in expressing the specification limit, in accordance with the rounding-off method of Practice E29. 1.3 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.4 Consult current OSHA regulations, suppliers’ Safety Data Sheets, and local regulations for all materials used in this specification. 1.5 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.
ASTM D6367-21 is classified under the following ICS (International Classification for Standards) categories: 75.080 - Petroleum products in general. The ICS classification helps identify the subject area and facilitates finding related standards.
ASTM D6367-21 has the following relationships with other standards: It is inter standard links to ASTM E2680-23, ASTM D7504-17a, ASTM D7504-17, ASTM D3160-16, ASTM D7504-15e1, ASTM D7504-15, ASTM D8005-15, ASTM E2680-09(2015)e1, ASTM D7977-14, ASTM D4590-13, ASTM D6144-12, ASTM D3160-12, ASTM D7504-11, ASTM D3437-11, ASTM D7504-10. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
ASTM D6367-21 is available in PDF format for immediate download after purchase. The document can be added to your cart and obtained through the secure checkout process. Digital delivery ensures instant access to the complete standard document.
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: D6367 −21
Standard Specification for
AMS (α-Methylstyrene)
This standard is issued under the fixed designation D6367; 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 specification covers AMS (α-Methylstyrene).
D4590 Test Method for Colorimetric Determination of
1.2 The following applies to all limits in this specification:
p-tert-Butylcatechol In Styrene Monomer or AMS
for purposes of determining conformance with this
(α–Methylstyrene) by Spectrophotometry
specification, an observed value or a calculated value shall be
D5386 Test Method for Color of Liquids Using Tristimulus
rounded off “to the nearest unit” in the last right-hand digit
Colorimetry
used in expressing the specification limit, in accordance with
D6144 Test Method forAnalysis ofAMS (α-Methylstyrene)
the rounding-off method of Practice E29.
by Capillary Gas Chromatography
D7504 Test Method for Trace Impurities in Monocyclic
1.3 The values stated in SI units are to be regarded as
standard. No other units of measurement are included in this Aromatic Hydrocarbons by Gas Chromatography and
Effective Carbon Number
standard.
D7977 Test Methods for Polymer Content of AMS (α-
1.4 Consult current OSHA regulations, suppliers’ Safety
Methylstyrene)
Data Sheets, and local regulations for all materials used in this
D8005 Test Method for Color of Clear Liquids (Platinum-
specification.
Cobalt Scale)
1.5 This international standard was developed in accor-
E29 Practice for Using Significant Digits in Test Data to
dance with internationally recognized principles on standard-
Determine Conformance with Specifications
ization established in the Decision on Principles for the
E2680 Test Method for Appearance of Clear, Transparent
Development of International Standards, Guides and Recom-
Liquids (Visual Inspection Procedure)
mendations issued by the World Trade Organization Technical
2.2 Other Documents:
Barriers to Trade (TBT) Committee.
OSHA Regulations 29 CFR paragraphs 1910.1000 and
1910.1200
2. Referenced Documents
3. Properties
2.1 ASTM Standards:
D3160 Test Method for Phenol Content of Cumene (Isopro-
3.1 AMS shall conform to the requirements shown in Table
pylbenzene) or AMS (α–Methylstyrene)
1.
4. Sampling
This specification is under the jurisdiction of ASTM Committee D16 on
4.1 Sample the material in accordance with Practice D3437.
Aromatic, Industrial, Specialty and Related Chemicals and is the direct responsi-
bility of Subcommittee D16.07 on Styrene, Ethylbenzene and C9 and C10Aromatic
5. Keywords
Hydrocarbons.
Current edition approved Nov. 1, 2021. P
...
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: D6367 − 17 D6367 − 21
Standard Specification for
AMS (α-Methylstyrene)
This standard is issued under the fixed designation D6367; 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 specification covers AMS (α-Methylstyrene).
1.2 The following applies to all limits in this specification: for purposes of determining conformance with this specification, an
observed value or a calculated value shall be rounded off “to the nearest unit” in the last right-hand digit used in expressing the
specification limit, in accordance with the rounding-off method of Practice E29.
1.3 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
1.4 Consult current OSHA regulations, suppliers’ Safety Data Sheets, and local regulations for all materials used in this
specification.
1.5 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
2.1 ASTM Standards:
D3160 Test Method for Phenol Content of Cumene (Isopropylbenzene) or AMS (α–Methylstyrene)
D3437 Practice for Sampling and Handling Liquid Cyclic Products
D4590 Test Method for Colorimetric Determination of p-tert-Butylcatechol In Styrene Monomer or AMS (α–Methylstyrene) by
Spectrophotometry
D5386 Test Method for Color of Liquids Using Tristimulus Colorimetry
D6144 Test Method for Analysis of AMS (α-Methylstyrene) by Capillary Gas Chromatography
D7504 Test Method for Trace Impurities in Monocyclic Aromatic Hydrocarbons by Gas Chromatography and Effective Carbon
Number
D7977 Test Methods for Polymer Content of AMS (α-Methylstyrene)
D8005 Test Method for Color of Clear Liquids (Platinum-Cobalt Scale)
E29 Practice for Using Significant Digits in Test Data to Determine Conformance with Specifications
E2680 Test Method for Appearance of Clear, Transparent Liquids (Visual Inspection Procedure)
This specification is 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, 2017Nov. 1, 2021. Published June 2017November 2021. Originally approved in 1999. Last previous edition approved in 20162017 as
D6367 – 16.D6367 – 17. DOI: 10.1520/D6367-17.10.1520/D6367-21.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at service@astm.org. For A
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