GB/T 2384-2021Dyes intermediates—General method for the determination of melting range (English PDF)

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).

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.

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.