Overview - ISO 12224-1:2024 (solder wire, solid and flux-cored)
ISO 12224-1:2024 specifies a coding system, performance requirements and test methods for solid and flux‑cored solder wire. The standard defines how to classify and designate solder alloys and flux types, sets requirements for solder and flux composition, flux content, dimensions and tolerances, and prescribes sampling, labelling and packaging rules. It also includes a normative solvent‑extraction method for obtaining flux test solutions.
Key topics and technical requirements
- Classification & designation
- Solder alloys designated per ISO 9453; fluxes classified per ISO 9454‑1.
- Designation format: ISO 12224-1 / [alloy designation] / [flux classification] (examples provided in the standard).
- Solder and flux composition
- Solder alloy composition must conform to ISO 9453.
- Flux composition (after solvent extraction using Annex A) must meet ISO 9454‑1 requirements.
- Flux content
- Recommended nominal flux contents listed (e.g., 0.3% to 6.5% mass) with permitted ranges based on tolerances: ±0.15% for nominal ≤ 1.0% and ±0.3% for nominal > 1.0%.
- Flux cores must be continuous and uniform along the wire length.
- Dimensions & tolerances
- Mean diameter tolerances when measured per Annex B: <0.5 mm ±0.03 mm; 0.5–2.5 mm ±0.05 mm; >2.5 mm ±0.1 mm.
- Performance tests
- Copper corrosion (ISO 9455‑15): specified exposure periods without evidence of corrosion, depending on flux type.
- Influence of flux vapours on insulation resistance (ISO 9455‑17): insulation resistance must not drop by more than one decade for specified flux types.
- Sampling & analysis
- Recommended chemical analysis: ICP (other acceptable methods include spark‑OES, AAS).
- Minimum sample for alloy analysis: 20 g of flux‑cored wire; flux separated by melting and solvent cleaning.
- Marking, labelling & packaging
- Labels must include supplier ID, designation, flux content, nominal diameter, net mass, batch/date of manufacture and any required safety warnings.
Applications - who uses this standard
- Manufacturers and suppliers of solder wire for electronics and general soldering
- Procurement and quality managers specifying material acceptance criteria
- Test laboratories performing flux and alloy analysis and corrosion/insulation testing
- PCB assemblers and electronics manufacturers requiring traceable labelling and consistent flux content
- Regulatory and conformity assessment stakeholders ensuring materials meet recognized international requirements
Related standards
- ISO 9453 - Soft solder alloys: compositions and forms
- ISO 9454‑1 - Soft soldering fluxes: classification, labelling and packaging
- ISO 9455‑15 / ISO 9455‑17 - Flux test methods (copper corrosion; insulation resistance)
- ISO 12224‑2 - Determination of flux content
Keywords: ISO 12224-1, solder wire, flux-cored solder, solid solder wire, flux content, solder classification, test methods, sampling, labelling, copper corrosion.
Open preview (PDF)Solder wire, solid and flux-cored — Specification and test methods — Part 1: Classification and performance requirements