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GB/T 23670-2025: CLT acid(2-Amino-4-methyl-5-chlorobenzenesulfonic acid)
Status: Valid GB/T 23670: Evolution and historical versions
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | Status | PDF |
| GB/T 23670-2025 | English | 219 |
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CLT acid(2-Amino-4-methyl-5-chlorobenzenesulfonic acid)
| Valid |
GB/T 23670-2025
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| GB/T 23670-2016 | English | 199 |
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2-amino-5-chloro-4-methylbenzenesulfonic acid (CLT acid)
| Valid |
GB/T 23670-2016
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| GB/T 23670-2009 | English | 399 |
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2-Amino-5-chloro-4-methybenzenesulfouic acid (CLT acid)
| Obsolete |
GB/T 23670-2009
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Basic data | Standard ID | GB/T 23670-2025 (GB/T23670-2025) | | Description (Translated English) | CLT acid(2-Amino-4-methyl-5-chlorobenzenesulfonic acid) | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | G56 | | Classification of International Standard | 71.100.01; 87.060.10 | | Word Count Estimation | 10,175 | | Date of Issue | 2025-08-29 | | Date of Implementation | 2026-03-01 | | Older Standard (superseded by this standard) | GB/T 23670-2016 | | Issuing agency(ies) | State Administration for Market Regulation, National Standardization Administration | GB/T 23670-2025: CLT acid(2-Amino-4-methyl-5-chlorobenzenesulfonic acid)---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT23670-2025
ICS 71.100.01;87.060.10
CCSG56
National Standard of the People's Republic of China
Replaces GB/T 23670-2016
CLT acid (2-amino-4-methyl-5-chlorobenzenesulfonic acid)
Released on August 29, 2025
Implementation on March 1, 2026
State Administration for Market Regulation
The National Standardization Administration issued
Preface
This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for standardization work Part 1.Structure and drafting rules for standardization documents"
Drafting.
This document replaces GB/T 23670-2016 "2-Amino-4-methyl-5-chlorobenzenesulfonic acid (CLT acid)" and is consistent with GB/T 23670-2016.
In addition to structural adjustments and editorial changes, the main technical changes are as follows.
a) The quality requirements for moisture have been changed (see Chapter 4, Chapter 3 of the.2016 edition);
b) The expression of sampling requirements and sampling volume have been changed (see Chapter 5, Chapter 4 of the.2016 edition);
c) The assessment method for appearance has been changed (see 6.2, 5.2 of the.2016 edition);
d) Added the atomic absorption determination method for iron ions (see 6.8.4);
e) The re-inspection content has been changed (see 7.3, 6.3 of the.2016 edition).
Please note that some of the contents of this document may involve patents. The issuing organization of this document does not assume the responsibility for identifying patents.
This document was proposed by the China Petroleum and Chemical Industry Federation.
This document is under the jurisdiction of the National Technical Committee on Standardization of Dyes (SAC/TC134).
This document was drafted by. Zhejiang Qinyan Technology Co., Ltd., Shenyang Shenyang Institute of Chemical Technology Testing Technology Co., Ltd., Shenyang Institute of Chemical Industry
Co., Ltd., Shenyang Chemical Testing Technology (Nantong) Co., Ltd.
The main drafters of this document are. Wang Xiaohui, Zhao Zhimin, Li Jingyi, Zhao Wei, Wang Ming, Zhang Tiexiong, and Tao Shuaijiang.
This document was first published in.2009, revised for the first time in.2016, and this is the second revision.
CLT acid (2-amino-4-methyl-5-chlorobenzenesulfonic acid)
1 Scope
This document specifies the requirements, sampling, test methods, inspection rules and standards for CLT acid (2-amino-4-methyl-5-chlorobenzenesulfonic acid) products.
Marking, labeling, packaging, transportation and storage.
This document applies to the production and inspection of CLT acid products.
Structural formula.
Molecular formula. C7H8ClNO3S.
Relative molecular mass. 221.66 (according to the 2022 international relative atomic mass).
CAS number. 88-53-9.
2 Normative references
The contents of the following documents constitute the essential clauses of this document through normative references in this document.
For referenced documents without a date, only the version corresponding to that date applies to this document; for referenced documents without a date, the latest version (including all amendments) applies to
This document.
GB/T 601 Preparation of standard titration solutions for chemical reagents
GB/T 603 Preparation of preparations and products used in test methods for chemical reagents
GB/T 2381 Dyes and dye intermediates - Determination of insoluble matter content
GB/T 2386-2014 Determination of moisture in dyes and dye intermediates
GB/T 3049 General method for determination of iron content in industrial chemical products - 1,10-phenanthroline spectrophotometric method
GB/T 6678-2003 General principles for sampling of chemical products
GB/T 6682-2008 Specifications and test methods for water used in analytical laboratories
GB/T 8170-2008 Rules for rounding off values and expression and determination of limit values
GB 20814 Limits and determination of heavy metal elements in dye products
GB/T 21876 Determination of ash content of solvent dyes and dye intermediates
3 Terms and Definitions
There are no terms or definitions that require definition in this document.
4 Requirements
The quality requirements of CLT acid shall comply with the requirements in Table 1.
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