GB/T 8026-2023Test method for drop melting point of petroleum wax,including petrolatum (English PDF)

Foreword

This document complies with the provisions of GB/T 1.1-2020 "Standardization Work Guidelines Part 1: Structure and Drafting Rules of Standardization Documents" Drafting.

This document replaces GB/T 8026-2014 "Method for determination of melting point of petroleum wax and petroleum grease droplets". Compared with GB/T 8026-2014, except for In addition to structural adjustments and editorial changes, the main technical changes are as follows.

a) Test method B is added to the scope (see Chapter 1);

b) Changed the definition of dripping melting point (see 3.1, 2014 version of 3.1);

c) Added relevant requirements for Method B (see 4.2, 5.2, 7.2, 10.2);

d) The water bath was changed to a bathroom, and the heat transfer medium requirements were added (see 5.1.2, 5.2 of the 2014 version);

e) Added quality control (see Chapter 9).

1 Scope

This document describes a method for the determination of the melting point of petroleum wax and petroleum grease droplets.

Method A in this document is suitable for the determination of the melting point of petroleum wax and petroleum grease droplets.

Method B in this document is suitable for the determination of droplet melting point during the production process of petroleum wax and petroleum grease, and is not applicable to synthetic wax, animal wax and plant wax.

Determination of melting point of wax droplets blended with petroleum wax.

2 Normative reference documents

The contents of the following documents constitute essential provisions of this document through normative references in the text. Among them, the dated quotations For undated referenced documents, only the version corresponding to that date applies to this document; for undated referenced documents, the latest version (including all amendments) applies to this document.

GB/T 514-2005 Technical specifications for liquid-in-glass thermometers for petroleum product testing

GB/T 4756 Manual sampling method for petroleum liquids

GB/T 27867 Automatic sampling method for petroleum liquid pipelines

SH/T 0229 Sampling method for solid and semi-solid petroleum products

3 Terms and definitions

The following terms and definitions apply to this document.

4 Principles

4.1 Method A Immerse the cooled thermometer into the sample so that the sample adheres to the mercury bulb of the thermometer. Place the thermometer with the sample adhered to the test tube, heat the test tube until the sample melts and the first drop drops from the mercury bulb of the thermometer. The dripping temperature is the drop melting point of the sample.