ASTM D7976-14(2020)
(Specification)Standard Specification for Purified Terephthalic Acid (PTA)
Standard Specification for Purified Terephthalic Acid (PTA)
ABSTRACT
This specification establishes requirements for purified terephthalic acid (PTA) used in the manufacturing of polymers, including the production of polyesters for fiber, filament, yarn, film, coating, bottle and resin applications. 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. This specification covers properties and sampling of the material.
SCOPE
1.1 This specification covers purified terephthalic acid (PTA) for use in the manufacturing of polymers. Some examples include the production of polyesters for fiber, filament, yarn, film, coating, bottle and resin applications.
1.2 The following applies to all specified 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, supplier’s Safety Data Sheets, and local regulations for all materials used in this specification.
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.
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
Relations
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: D7976 −14 (Reapproved 2020)
Standard Specification for
Purified Terephthalic Acid (PTA)
This standard is issued under the fixed designation D7976; 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 Terephthalic Acid by Capillary Electrophoresis with Re-
verse Voltage Mode
1.1 This specification covers purified terephthalic acid
D7882 Test Method for Determination of
(PTA) for use in the manufacturing of polymers. Some
4-Carboxybenzaldehyde and p-Toluic Acid in Purified
examples include the production of polyesters for fiber,
Terephthalic Acid by Capillary Electrophoresis with Nor-
filament, yarn, film, coating, bottle and resin applications.
mal Voltage Mode
1.2 The following applies to all specified limits in this
D7883 Test Method for Determination of
specification: for purposes of determining conformance with
4-Carboxybenzaldehyde and p-Toluic Acid in Purified
this specification, an observed value or a calculated value shall
TerephthalicAcid by WeakAnion Exchange High Perfor-
be rounded off to the nearest unit in the last right-hand digit
mance Liquid Chromatography
used in expressing the specification limit, in accordance with
D7884 Test Method for Determination of
the rounding-off method of Practice E29.
4-Carboxybenzaldehyde and p-Toluic Acid in Purified
1.3 The values stated in SI units are to be regarded as Terephthalic Acid by Reverse Phase High Performance
Liquid Chromatography
standard. No other units of measurement are included in this
standard. E29 Practice for Using Significant Digits in Test Data to
Determine Conformance with Specifications
1.4 Consult current OSHA regulations, supplier’s Safety
E300 Practice for Sampling Industrial Chemicals
Data Sheets, and local regulations for all materials used in this
2.2 Other Documents:
specification.
OSHA Regulations, CFR 29 paragraphs 1910.1000 and
1.5 This standard does not purport to address all of the 3
1910.1200
safety concerns, if any, associated with its use. It is the
responsibility of the user of this standard to establish appro-
3. Terminology
priate safety, health, and environmental practices and deter-
3.1 Definitions:
mine the applicability of regulatory limitations prior to use.
3.1.1 purified terephthalic acid, n—(C H O ) molecular
8 6 4
1.6 This international standard was developed in accor-
weight, 166.13; white crystalline solid or powder; sublimes,
dance with internationally recognized principles on standard-
402 to 404°C; abbreviated as PTA (CAS #100-21-0).
ization established in the Decision on Principles for the
3.1.2 4-carboxybenzaldehyde, n—(C H O ) molecular
8 6 3
Development of International Standards, Guides and Recom-
weight, 150.13; white to yellow crystalline solid or powder;
mendations issued by the World Trade Organization Technical
melting point, 247°C; abbreviated
...
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