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GB/T 2384-2021: Dyes intermediates - General method for the determination of melting range
Status: Valid GB/T 2384: Evolution and historical versions
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | Status | PDF |
| GB/T 2384-2021 | English | 159 |
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Dyes intermediates - General method for the determination of melting range
| Valid |
GB/T 2384-2021
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| GB/T 2384-2015 | English | 279 |
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Dyes intermediates -- General method for the determination of melting range
| Obsolete |
GB/T 2384-2015
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| GB/T 2384-2007 | English | 239 |
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Dyes intermediates -- General method for the determination of melting range
| Obsolete |
GB/T 2384-2007
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| GB/T 2384-1992 | English | 199 |
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Dye intermediates general method for the determination of melting range
| Obsolete |
GB/T 2384-1992
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PDF similar to GB/T 2384-2021
Basic data | Standard ID | GB/T 2384-2021 (GB/T2384-2021) | | Description (Translated English) | Dyes intermediates - General method for the determination of melting range | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | G55 | | Word Count Estimation | 7,725 | | Issuing agency(ies) | State Administration for Market Regulation, China National Standardization Administration | GB/T 2384-2021: Dyes intermediates - General method for the determination of melting range---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Dyes intermediates -- General method for the determination of melting range
ICS 71:100:01; 87:060:10
CCSG55
National Standards of People's Republic of China
Replacing GB/T 2384-2015
General method for determination of melting point range of dye intermediates
Published on 2021-12-31
2022-07-01 Implementation
State Administration for Market Regulation
Released by the National Standardization Administration
foreword
This document is in accordance with the provisions of GB/T 1:1-2020 "Guidelines for Standardization Work Part 1: Structure and Drafting Rules of Standardization Documents"
drafted:
This document replaces GB/T 2384-2015 "General Method for Determination of Melting Point Range of Dyestuff Intermediates", which is consistent with GB/T 2384-2015
In addition to structural adjustments and editorial changes, the main technical changes are as follows:
a) Added normative references (see Chapter 2);
b) Changed terms and definitions (see Chapter 3, Chapter 2 of the:2015 edition);
c) Changed the requirements for reagents and materials (see Chapter 4 of 4:1:2,:2015 edition);
d) Added general requirements for thermometers (see 4:1:3:2);
e) Changed the requirements for heaters (see 4:1:4:1, 5:3:1 of the:2015 edition);
f) The rounding requirements for calculation results are added (see 4:1:5:4);
g) Added capillary melting point test method (see 4:2):
Please note that some content of this document may be patented: The issuing agency of this document assumes no responsibility for identifying patents:
This document is proposed by China Petroleum and Chemical Industry Federation:
This document is under the jurisdiction of the National Dyestuff Standardization Technical Committee (SAC/TC134):
This document is drafted by: Zhejiang Dibang Chemical Co:, Ltd:, Zhejiang Boao New Materials Co:, Ltd:, Anhui Bayi Chemical Co:, Ltd:
Company, Shenyang Chemical Research Institute Co:, Ltd:, Shenyang Shenyang Chemical Research Institute Testing Technology Co:, Ltd:, Transfar Zhilian Co:, Ltd:, National Dyestuff Quality
Supervision and Inspection Center:
The main drafters of this document: Yang Baode, Xu Wanfu, Meng Xiangqi, Peng Dexin, Xue Yan, Fu Weisong, Wen Weidong, Dong Rusheng, Yang Jiemin, Chen Sujuan,
Lu Shuang:
The previous versions of this document and its superseded documents are as follows:
---First published in 1980 as GB 2384-1980;
---The first revision in:1992 was GB/T 2384-1992, the second revision in:2007, and the third revision in:2015;
---This is the fourth revision:
General method for determination of melting point range of dye intermediates
1 Scope
This document specifies a general method for the determination of the melting point of dye intermediates by the capillary liquid bath method and the capillary melting point apparatus:
This document applies to the determination of the melting point of crystalline or powdered dye intermediates:
2 Normative references
The contents of the following documents constitute essential provisions of this document through normative references in the text: Among them, dated citations
documents, only the version corresponding to that date applies to this document; for undated references, the latest edition (including all amendments) applies to
this document:
GB/T 8170-2008 Numerical Rounding Rules and Representation and Judgment of Limit Values
JJG130-2011 Working glass liquid thermometer
JJG701-2008 Melting point tester
3 Terms and Definitions
The following terms and definitions apply to this document:
3:1
melting range
The temperature range when the sample appears obvious droplets in the capillary to completely melted:
Note: Also known as fusion range or fusion distance:
3:2
initialmeltingpoint
The temperature at which the sample begins to melt locally in the capillary tube and noticeably droplets appear:
3:3
final melting point finalmeltingpoint
The temperature at which the sample is completely melted in the capillary:
4 Test methods
WARNING - Persons using this document should have practical experience in formal laboratory work: This document does not address all possible security issues
question: It is the user's responsibility to take appropriate safety and health measures and to ensure compliance with the conditions stipulated by relevant national regulations:
4:1 Capillary liquid bath method (arbitration method)
4:1:1 Method principle
By heating the liquid medium, the temperature of the sample in the capillary is gradually increased from its initial melting temperature to a temperature higher than its final melting temperature:
Visually observe the temperature of initial melting and final melting to determine the melting point range of the sample:
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