Overview
EN ISO 4625-1:2020 - Binders for paints and varnishes: Determination of softening point - Part 1: Ring-and-ball method is the CEN-endorsed European adoption of ISO 4625-1:2020. It specifies laboratory test methods (both automated and manual ring-and-ball procedures) for determining the softening point of resins and rosin-based binders used in paints and varnishes. The automated ring-and-ball method is declared the reference method. This standard is widely used for quality control, material specification and regulatory reporting in the coatings and adhesive industries.
Key Topics and Requirements
- Scope and materials: Applies to resins (including rosin) and similar thermoplastic binder materials used in coatings.
- Test methods: Defines both the automated ring-and-ball method (reference) and a manual ring-and-ball method (alternate).
- Sampling and preparation: Requirements for sampling and procedures to prepare test pieces, including a pour method and special handling for low softening point materials.
- Apparatus and calibration: Detailed apparatus descriptions and calibration requirements (including temperature sensors) to ensure repeatable results.
- Procedures by temperature range: Specified procedures for materials with softening points in different ranges (e.g., up to ~35 °C, between ~35 °C and 80 °C, 80 °C–150 °C, and above 150 °C).
- Test reporting and interpretation: Guidance on expression of results, recording of test conditions, and reporting precision, bias and uncertainty.
- Precision and bias: Precision data and inter-laboratory considerations for both automated and manual methods are included.
- Normative references: Cross-references to ISO 4618 (terms and definitions), ISO 15528 (sampling) and IEC 60751 (temperature sensors).
Applications and Who Uses It
- Quality control laboratories in paint, varnish and resin manufacturing to verify softening behavior of binders.
- R&D teams developing coating formulations where thermoplastic transitions affect performance.
- Regulatory and compliance professionals, since ISO 4625-1 is referenced in regulatory contexts (e.g., Title 21 CFR).
- Procurement and specification writers who need standardized softening point data for material selection and supplier contracts.
- Test houses and certification bodies performing accredited testing of coating raw materials.
Related Standards
Keywords: EN ISO 4625-1:2020, ring-and-ball method, softening point, binders for paints, varnishes, rosin, automated ring-and-ball, coatings quality control, ISO 4625 series.