Overview
EN ISO 12224-1:2024 (ISO 12224-1:2024) specifies a coding system, classification and performance requirements for solder wire - both solid and flux-cored. The standard defines how solder alloys and fluxes are designated, sets composition and flux-content requirements, and prescribes requirements for sampling, labelling and packaging. Normative annexes describe solvent extraction of flux (Annex A) and measurement of wire diameter (Annex B), while Annex C provides guidance on applicable test methods.
Key Topics
- Classification and designation
- Solder alloy designation follows ISO 9453.
- Flux classification uses the system in ISO 9454-1.
- Flux-cored solder wire designations combine the standard reference, alloy name and flux class (e.g., ISO 12224-1/Sn99,3Cu0,7/1 123).
- Composition and performance requirements
- Solid wire and the solder component of flux-cored wire must meet alloy chemical composition requirements in ISO 9453.
- Flux composition (after solvent extraction per Annex A) must meet flux-type requirements in ISO 9454-1.
- Flux content and dimensions
- Recommended nominal flux contents are listed (Table 1); actual flux content is verified using ISO 12224-2.
- Wire diameter and tolerances are specified; Annex B details mean-diameter measurement.
- Functional tests and sampling
- Copper corrosion and surface insulation resistance/electrochemical migration tests are referenced (ISO 9455 series, ISO 9455-15, ISO 9455-17).
- Sampling procedures for chemical analysis, flux-property tests and flux-content/diameter tests are specified.
- Marking, labelling and packaging
- Requirements for product identification and packaging to ensure traceability and safe handling.
Applications
EN ISO 12224-1:2024 is used where consistent classification and verified performance of solder wire are critical:
- Solder wire manufacturers - to label and certify product composition, flux type and flux content.
- Quality and compliance teams - to verify incoming materials meet alloy and flux specifications.
- Electronics OEMs and assemblers - to select flux-cored or solid wire compatible with component cleanliness and reliability requirements.
- Test laboratories - to perform composition analysis, flux extraction and standard test methods.
- Procurement and supply chain - to create unambiguous purchase specifications and supplier declarations.
Related Standards
This standard streamlines selection, testing and traceability of solid and flux-cored solder wire, supporting consistent soldering quality and regulatory compliance across manufacturing and electronics assembly.