GB/T 38265.3-2022Test methods for soft soldering fluxes - Part 3: Determination of acid value - Potentiometric and visual titration methods (English PDF)

1 Scope

This document specifies the determination methods for the acid value of solder --- potentiometric titration and visual titration, including principles, reagents, instruments and equipment, test methods

Test steps, test data processing, precision, test report, etc.

This document applies to Type 1 and Type 2 solder fluxes defined in GB/T 15829.

2 Normative references

The contents of the following documents constitute the essential provisions of this document through normative references in the text. Among them, dated references

For documents, only the version corresponding to the date is applicable to this document; for undated reference documents, the latest version (including all amendments) is applicable to this document.

GB/T 678 Chemical Reagent Ethanol (Dehydrated Ethanol) (GB/T 678-2002, ISO 6353-2.1983, NEQ)

GB/T 684 chemical reagent toluene (GB/T 684-1999, ISO 6353-2.1983, NEQ)

GB/T 6379 (all parts) Accuracy (trueness and precision) of measurement methods and results [ISO 5725 (all parts), IDT]

Note. GB/T 6379.1-2004 Accuracy of measurement methods and results (trueness and precision) Part 1.General principles and definitions (ISO 5725-1.1994,

IDT);

GB/T 6379.2-2004 Accuracy of measurement methods and results (trueness and precision) Part 2.Determining the repeatability and repeatability of standard measurement methods

The basic method of presentability (ISO 5725-2.1994, IDT);

GB/T 6379.3-2004 Accuracy of measurement methods and results (trueness and precision) Part 3.Intermediate degree of precision of standard measurement methods

Quantity (ISO 5725-3.1994, IDT);

GB/T 6379.4-2006 Accuracy of measurement methods and results (trueness and precision) Part 4.Basis for determining the accuracy of standard measurement methods

This method (ISO 5725-4.1994, IDT);

GB/T 6379.5-2006 Accuracy of measurement methods and results (trueness and precision) Part 5.The reliability of determining the precision of standard measurement methods alternative method (ISO 5725-5.1998, IDT);

GB/T 6379.6-2004 Accuracy of measurement methods and results (trueness and precision) Part 6.Practical application of accuracy values (ISO 5725-6.1994, IDT).

GB/T 38265.1 Test methods for solder fluxes Part 1.Gravimetric method for the determination of non-volatile matter content (GB/T 38265.1-

2019, ISO 9455-1.1990, MOD)

GB/T 38265.2 Soldering Flux Test Methods Part 2.Determination of Non-volatile Matter Content by Boiling Point Method (GB/T 38265.2-

2019, ISO 9455-2.1993, MOD)

HG/T 2892 Chemical Reagent Isopropanol (HG/T 2892-2020, ISO 6353-3.1987, NEQ)

3 Terms and Definitions

This document does not have terms and definitions that need to be defined. […]