IEC 61190-1-1:2002

Overview

IEC 61190-1-1:2002 is an international standard published by the International Electrotechnical Commission (IEC) that specifies the general requirements for the classification and testing of soldering fluxes used for high-quality interconnections in electronics assembly. As a critical reference in electronics manufacturing, this standard serves as a comprehensive document for flux characterization, quality assurance, and procurement, covering solder flux and flux-containing materials utilized in electronics assembly technology.

Key Topics

Classification of Soldering Fluxes

• Chemical Composition: Soldering fluxes are classified by their primary chemical makeup, including rosin (natural resin), resin (synthetic), organic (other than rosin/resin), and inorganic.
• Form Factor: Fluxes are categorized by form: liquid (L), solid (S), or paste/cream (P).
• Activity Level: Classification depends on the flux or residue’s corrosive or conductive properties - divided into low (L), moderate (M), or high (H) activity levels.

General Requirements and Testing

• Flux Performance: Only fluxes that achieve the required electrical and metallurgical interconnection are deemed acceptable.
• Test Methods: Methods specified for characterizing flux efficacy, typically via standardized wetting balance tests and other performance indicators.
• Quality Control: The standard sets out processes for qualification, inspection routines, and compliance verification for incoming batches of flux.
• Documentation: Detailed requirements for labelling, test reporting, and data recording to support traceability and reliability in assembly processes.

Application Versatility

• Scope of Use: Applicable to all types of soldering fluxes used in electronics, including those for wave soldering, lead tinning, reflow soldering, and printed wiring board (PWB) fabrication.
• Materials Covered: Encompasses solder pastes, flux-cored wires, and flux-coated preforms-used in consumer, industrial, and commercial electronics.

Applications

IEC 61190-1-1 is widely adopted by manufacturers, quality assurance teams, and procurement specialists involved in electronics assembly. Typical practical applications include:

• Incoming Material Inspection: Verifying that soldering fluxes meet standardized classification and performance criteria during receipt and storage.
• Process Development: Using flux activity and composition classifications to select suitable fluxes for different soldering methods and component assemblies.
• Supplier Qualification: Establishing consistent requirements for sourcing and accepting flux materials from suppliers, ensuring product compatibility and reliability.
• Product Verification & Compliance: Facilitating audits and traceability by requiring clear labelling, comprehensive documentation, and adherence to tested methods.

By standardizing requirements, the document helps ensure quality soldered interconnections, reduce assembly defects, and streamline product approvals for global electronics markets.

Related Standards

Organizations implementing IEC 61190-1-1:2002 should also consider the following related standards:

• IEC 60194: Printed board design, manufacture, and assembly - Terms and definitions
• IEC 61189-2/3: Test methods for materials and interconnections in electronics assemblies
• ISO 9002:1994: Quality systems – Model for quality assurance in production, installation, and servicing
• ISO 9455-16: Soft soldering fluxes – Test methods – Part 16: Flux efficacy tests, wetting balance method

These standards complement IEC 61190-1-1 by providing detailed procedures, quality frameworks, and terminology that support robust, high-quality electronics assembly practices.

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