GB/T 30921.5-2025 Active National standards

GB/T 30921.5-2025 Test methods of purified terephthalic acid(PTA) for industrial use—Part 5:Determination of acid number

GB/T 30921.5-2025 Test methods of purified terephthalic acid(PTA) for industrial use—Part 5:Determination of acid number

Publish Date: 2025-12-02 Implement Date: 2026-07-01 For services related to genuine standard inquiry, procurement, translation, and other related services in China, please Contact Us

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Basic Information

Standard Code: GB/T 30921.5-2025

Standard Type: National standards

Standard Status: Active

is_force_gb: no

CCS Name: Basic organic chemical raw materials

ICS Name: Organic acids

Publish Date: 2025-12-02

Implement Date: 2026-07-01

Pages: 12 pages

Scope

This document describes the indicator method and potentiometric titration method for determining the acid value of industrial-grade terephthalic acid (PTA).
This document is applicable to the determination of the acid value of industrial-grade terephthalic acid (PTA).

Development Information

Word Count: 15 Thousand words Pages: 12 pages

Same series standard

GB/T 30921.6-2025 Test methods of purified terephthalic acid(PTA) for industrial use—Part 6:Determination of particle size distribution

Replace the following standards

GB/T 30921.5-2016 Test method of purified terephthalic acid(PTA) for industrial use—Part 5:Determination of acid number

Referenced Standards

GB/T 601-2002 Chemical reagent Preparations of standard volumetric solutions GB/T 601-2016 Chemical reagent—Preparations of reference titration solutions GB/T 3723-1999 Sampling of chemical products for industrial use—Safety in sampling GB/T 6679-2003 General rules for sampling solid chemical products GB/T 6682-1992 Water for analytical laboratory use—Specification and test methods GB/T 6682-2008 Water for analytical laboratory use—Specification and test methods GB/T 8170-1987 Rules for rounding off of numberical values GB/T 8170-2008 Rules of rounding off for numerical values & expression and judgement of limiting values JJG 814-2015 Automatic Potentiometric Titrators

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SH/T 1499.1-1997 Replaced

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SH/T 1499.2-1997 Active

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Publish Date: 1997-07-12

SH/T 1499.3-1997 Replaced

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