Overview
EN ISO 19403-1:2022 - Paints and varnishes - Wettability - Part 1: Vocabulary and general principles (ISO 19403-1:2022) defines the standardized terminology and high‑level principles used across the ISO 19403 series. This 2022 edition (CEN-approved) updates and consolidates terms related to wettability, contact angle measurement, surface free energy, and surface tension, and is intended to be used together with ISO 4618 (paints and varnishes vocabulary).
Key topics
- Core vocabulary: precise definitions for terms such as surface free energy, surface tension, interfacial energy, contact angle, three‑phase point, base line and top‑view angle.
- Surface descriptors: definitions for chemical homogeneity and topological homogeneity relevant to contact‑angle testing.
- Liquid surface measurement terms: pendant drop, shape parameter (B), Young–Laplace equation, and fit error used in drop contour analysis.
- Wettability concepts: inclusion of modern surface wetting descriptors added or refined in the 2022 revision, e.g. hydrophobic, superhydrophobic, hydrophilic, superhydrophilic, and superhydrophobic coating.
- General principles (Annex A): informative notes on measurement principles (e.g., surface free energy concepts and pendant drop considerations) that support the definitions.
- Limitations noted: applicability can be restricted for liquids with non‑Newtonian behaviour.
Practical applications
EN ISO 19403-1:2022 provides the foundational vocabulary and concepts used across optical test methods for wettability and surface characterization. Typical uses include:
- Ensuring consistent terminology in laboratory test reports, technical specifications and product data sheets for paints, varnishes and coatings.
- Supporting contact angle and surface free energy measurements used in R&D, quality control and failure analysis.
- Enabling accurate interpretation of results from related ISO 19403 parts (e.g., contact‑angle measurement methods, pendant drop analysis).
- Guiding coating formulators, substrate pretreatment specialists, surface engineers, and third‑party testing laboratories in consistent reporting and comparison of wettability data.
Who should use it
- Coating and paint manufacturers
- Surface science and analytical laboratories
- Quality assurance teams and product certification bodies
- Researchers in materials science and industrial R&D
- Standards writers and regulatory bodies
Related standards
- ISO 4618 (paints and varnishes - vocabulary) - intended companion for broader paint industry terms.
- Other parts of the ISO 19403 series (measurement methods for contact angle, surface free energy and liquid surface tension).
Keywords: EN ISO 19403-1:2022, wettability standard, contact angle, surface free energy, surface tension, pendant drop, Young–Laplace, paints and varnishes, coating wettability.
