ASTM D8062-22 含低甲基苯甲酸的精对苯二甲酸（PTA）的标准规范.pdf

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 Remendations issued by the World Trade Organization Technical Barriers to Trade (TBT)Committee. Designation:D8062-22 INTERNATIONAL Standard Specification for Purified Terephthalic Acid (PTA)with Low p-Toluic Acid1 This standard is issued under the fixed designation D8062: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 superseript epsilon (s)indicates an editorial change since the last revision or reapproval. 1.Scope* Terephthalic Acid by Capillary Electrophoresis with Re- 1.1 This specification covers purified terephthalic acid verse Voltage Mode (PTA)for use in the production of polyesters for superfine D7882 Test Method for Determination of denier fiber. 4-Carboxybenzaldehyde and p-Toluic Acid in Purified Terephthalic Acid by Capillary Electrophoresis with Nor- 1.2 The following applies to all specified limits in this mal Voltage Mode specification:for purposes of determining conformance with D7883 Test Method for Determination of this specification an observed value or a calculated value shall 4-Carboxybenzaldehyde and p-Toluic Acid in Purified be rounded off to the nearest unit in the last right-hand...