ISO 9455-6:2022 PDF

Soft soldering fluxes — Test methods — Part 6: Determination and detection of halide (excluding fluoride) content

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Title (English):

ISO 9455-6:2022

Soft soldering fluxes — Test methods — Part 6: Determination and detection of halide (excluding fluoride) content

Document status:: Active
Format:: Electronic (PDF)
Number of pages:: 15
Publication date:: December 14, 2022
Edition:: ISO IS 9455 edition 2 version 1
ICS:: 25.160.50

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Description (English):

This document specifies three quantitative methods for the determination of the ionic halide (excluding fluoride) content of soldering fluxes. Halides are calculated as chlorides. A useful qualitative test method for the detection of ionic halides is also described. Method A is a potentiometric titration method for the determination of halide (excluding fluoride) content and is applicable to flux classes 1 and 2, defined in ISO 9454-1. This method, which is considered the reference method for these fluxes, is suitable for halide contents generally within the range of 0,05 % mass fraction to 2 % mass fraction in the non-volatile matter of the flux. Method B is a titration method for the determination of the total halide (excluding fluoride) content of water-soluble fluxes. It is applicable to flux classes 2122 to 2124, 3112 to 3114 and 3212 to 3214, as defined in ISO 9454-1. Method C is a titration method for the determination of the halide (excluding fluoride) content of water-soluble fluxes containing phosphates and is applicable to flux class 331, as defined in ISO 9454-1. Method D is a qualitative test, using silver chromate test paper, for the presence of ionic halides. The technique can be used for all classes of flux.

Technical details

Technical committee: ISO/TC 44/SC 12 - Soldering materials
SKU: ISO 9455-6:2022

Abstract

Overview

ISO 9455-6:2022 specifies test methods for the determination and detection of ionic halide (excluding fluoride) content in soft soldering fluxes. Halides are reported as chlorides. The standard defines three quantitative titration procedures (Methods A, B, C) and one qualitative detection test (Method D), covering a wide range of flux chemistries and practical laboratory requirements.

Key topics

Scope and reporting
- Ionic halides (chloride equivalent) only; fluoride excluded.
- Results can be expressed as percentage by mass in the flux or in the non‑volatile matter.
Method A - Potentiometric titration (reference method)
- Uses silver nitrate (0.02 mol/L) titrant and a silver electrode with a suitable reference electrode (mercury/mercurous sulfate or reversible hydrogen).
- Applicable to flux classes 1 and 2 (per ISO 9454-1).
- Suitable for typical halide ranges (generally 0.05 % to 2 % mass fraction in non‑volatile matter); procedure commonly targets ~0.1 % to 1 % and prescribes sample mass adjustments outside this range.
- Involves plotting potential (mV) vs titrant volume, determining inflection point and calculating percentage using provided formulae and a correlation factor (f) from standardization.
Method B - Titration for water‑soluble fluxes
- Designed for total halide determination in water‑soluble fluxes (flux classes 2122–2124, 3112–3114, 3212–3214).
- Uses silver nitrate followed by back‑titration with ammonium thiocyanate; includes blank correction.
Method C - Titration for phosphate‑containing water‑soluble fluxes
- Specific procedure for flux class 331 (phosphate‑containing).
- Similar titrimetric approach with reagent adjustments to account for phosphates.
Method D - Qualitative detection
- Rapid screening using silver chromate test paper for the presence of ionic halides; applicable to all flux classes.
Quality control aspects
- Use of analytical‑grade reagents, deionized water, blank determinations, triplicate testing (Method A) and standardization (Annex A for silver nitrate).

Applications and users

ISO 9455-6:2022 is used by:

Solder flux manufacturers for product characterization and quality control
Independent testing laboratories and R&D teams validating flux chemistry
Electronics assemblers and QA teams verifying flux acceptability and process compatibility
Procurement and compliance specialists requiring documented test methods for specifications

Practical benefits include reliable quantification of ionic halides (critical for corrosion and solderability performance), consistent reporting across suppliers, and fast screening tools for production environments.

Related standards

ISO 9454-1 - flux classification (referenced for applicability of methods)
ISO 9455-1 / ISO 9455-2 - determination of non‑volatile matter (used when reporting halides in non‑volatile content)
Annex A of ISO 9455-6 - method for standardizing silver nitrate solution

Keywords: ISO 9455-6:2022, soft soldering fluxes, halide content, potentiometric titration, silver nitrate, ammonium thiocyanate, silver chromate, ISO 9454-1, flux testing, solder flux QC.

Related standards

Standards mentioned in the description

Abstract

Overview

Key topics

Scope and reporting
- Ionic halides (chloride equivalent) only; fluoride excluded.
- Results can be expressed as percentage by mass in the flux or in the non‑volatile matter.
Method A - Potentiometric titration (reference method)
- Uses silver nitrate (0.02 mol/L) titrant and a silver electrode with a suitable reference electrode (mercury/mercurous sulfate or reversible hydrogen).
- Applicable to flux classes 1 and 2 (per ISO 9454-1).
- Suitable for typical halide ranges (generally 0.05 % to 2 % mass fraction in non‑volatile matter); procedure commonly targets ~0.1 % to 1 % and prescribes sample mass adjustments outside this range.
- Involves plotting potential (mV) vs titrant volume, determining inflection point and calculating percentage using provided formulae and a correlation factor (f) from standardization.
Method B - Titration for water‑soluble fluxes
- Designed for total halide determination in water‑soluble fluxes (flux classes 2122–2124, 3112–3114, 3212–3214).
- Uses silver nitrate followed by back‑titration with ammonium thiocyanate; includes blank correction.
Method C - Titration for phosphate‑containing water‑soluble fluxes
- Specific procedure for flux class 331 (phosphate‑containing).
- Similar titrimetric approach with reagent adjustments to account for phosphates.
Method D - Qualitative detection
- Rapid screening using silver chromate test paper for the presence of ionic halides; applicable to all flux classes.
Quality control aspects
- Use of analytical‑grade reagents, deionized water, blank determinations, triplicate testing (Method A) and standardization (Annex A for silver nitrate).

Applications and users

ISO 9455-6:2022 is used by:

Solder flux manufacturers for product characterization and quality control
Independent testing laboratories and R&D teams validating flux chemistry
Electronics assemblers and QA teams verifying flux acceptability and process compatibility
Procurement and compliance specialists requiring documented test methods for specifications

Related standards

ISO 9454-1 - flux classification (referenced for applicability of methods)
ISO 9455-1 / ISO 9455-2 - determination of non‑volatile matter (used when reporting halides in non‑volatile content)
Annex A of ISO 9455-6 - method for standardizing silver nitrate solution

Keywords: ISO 9455-6:2022, soft soldering fluxes, halide content, potentiometric titration, silver nitrate, ammonium thiocyanate, silver chromate, ISO 9454-1, flux testing, solder flux QC.

ISO 9455-6:2022 PDF

Technical details

Abstract

Overview

Key topics

Applications and users

Related standards

Related standards

Abstract

Overview

Key topics

Applications and users

Related standards

Related standards

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