SIST EN ISO 9455-6:2023 PDF

Overview

EN ISO 9455-6:2022 - published by CEN/ISO - specifies test methods to determine and detect ionic halide content (excluding fluoride) in soft soldering fluxes. Halides are reported as chloride equivalents. The standard defines three quantitative titration procedures (Methods A, B, C) for different flux types and a qualitative screening test (Method D) using silver chromate test paper.

Key topics and requirements

• Scope
  • Quantitative determination of ionic halides (excluding fluoride) in soldering fluxes.
  • Qualitative detection of ionic halides for rapid screening.
• Methods
  • Method A (Reference - potentiometric titration):
    • Applicable to flux classes 1 and 2 (per ISO 9454-1).
    • Suitable for halide contents typically 0.05% to 2% mass fraction in the non‑volatile matter.
  • Method B (titration):
    • For water‑soluble fluxes, applicable to classes 2122–2124, 3112–3114, 3212–3214.
  • Method C (titration with phosphate matrix considerations):
    • For water‑soluble fluxes containing phosphates, applicable to flux class 331.
  • Method D (qualitative):
    • Silver chromate test paper technique for presence/absence of ionic halides; usable across all flux classes.
• Reporting
  • Results expressed as chloride equivalents; procedures include sample preparation, titrant standardization and calculation formulas.
• Precision and applicability
  • The document includes precision information and guidance on method selection by flux class.

Applications and who uses it

• Flux manufacturers - quality control and product specification verification.
• Electronics assemblers and PCB manufacturers - ensure fluxes meet assembly and residue cleanliness requirements.
• Test laboratories and third‑party certification bodies - routine testing, compliance testing and auditing.
• R&D teams - formulation development and comparative evaluation of flux halide levels.
• Procurement and regulatory compliance - verify supplier declarations and meet industry standards for soldering consumables.

Practical use cases include process control for soldering operations, evaluating corrosivity risk associated with ionic halides, and demonstrating conformity to industry requirements.

Related standards

• ISO 9454-1 - flux classification referenced throughout EN ISO 9455-6:2022.
• Other parts of the ISO 9455 series - additional test methods for soft soldering fluxes.
• Adopted as EN ISO 9455-6:2022 by CEN (European national standards bodies).

Keywords: soft soldering fluxes, halide content, potentiometric titration, silver chromate test paper, ISO 9455-6:2022, flux classification, test methods, chloride equivalents.