EN ISO 4625-1:2020 PDF

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

• ISO 4625 series:
  • ISO 4625-2 - Mettler cup-and-ball method (widely used in some regions)
  • Future part - Mettler method without the ball
• Normative references: ISO 4618, ISO 15528, IEC 60751

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.