ISO 19403-5-2024 PDF

Full title and description

Paints and varnishes — Wettability — Part 5: Determination of the polar and dispersive fractions of the surface tension of liquids from contact angles measurements on a solid with only a disperse contribution to its surface energy. This document specifies an optical test method to determine the polar and dispersive components of liquid surface tension for the characterisation of liquid coating materials.

Abstract

This standard defines a contact-angle based optical procedure to calculate the polar and dispersive fractions of the surface tension of liquids using measurements on a reference solid that provides only a dispersive contribution to surface energy. It is intended primarily for characterisation of liquid coating materials and notes possible restrictions when applied to liquids with non‑Newtonian flow behaviour.

General information

• Status: Published / Current.
• Publication date: 18 October 2024.
• Publisher: International Organization for Standardization (ISO).
• ICS / categories: 87.040 (Paints and varnishes / Paint and colour industries).
• Edition / version: Edition 2 (2024).
• Number of pages: 6 pages (ISO published version).

Scope

This part of ISO 19403 specifies a test method by optical contact-angle measurement to determine the polar and dispersive fractions of the surface tension of liquids using a solid reference that contributes only dispersive surface energy. The method is applicable for characterisation of liquid coating materials; however, the standard highlights that restrictions can apply for liquids exhibiting non‑Newtonian flow behaviour. The procedure supports laboratory evaluation and comparative characterisation rather than direct performance prediction on formulated systems in all end‑use conditions.

Key topics and requirements

• Optical contact-angle measurement technique for liquids (drop/profile methods).
• Calculation and separation of polar and dispersive fractions of liquid surface tension.
• Use of a reference solid with only a dispersive contribution to surface energy as the measurement substrate.
• Consideration of liquid rheology — possible limitations for non‑Newtonian liquids (reference to ISO 3219‑1 definitions).
• Intended for characterisation of liquid coating materials and laboratory intercomparisons.

Typical use and users

Used by coating and formulation chemists, surface‑science laboratories, quality control and R&D departments, materials test laboratories, and academic researchers who need standardised contact‑angle procedures to characterise liquid surface tension components for coatings and liquids. It is typically employed where clear separation of polar and dispersive contributions is required for surface and interfacial analysis.

Related standards

ISO 19403 is a multipart series addressing wettability and contact‑angle based methods. Relevant parts in the series include ISO 19403‑1 (vocabulary and general principles), ISO 19403‑2 (determination of surface free energy of solids by contact angle), ISO 19403‑3 (surface tension of liquids by pendant drop), ISO 19403‑4 (determination of polar/dispersive fractions from interfacial tension), ISO 19403‑6 (dynamic advancing and receding angles by volume change) and ISO 19403‑7 (dynamic contact angles and roll‑off angle on a tilt stage). These parts together provide coherent procedures and terminology for wettability testing of substrates, coatings and liquids.

Keywords

wettability; contact angle; surface tension; polar fraction; dispersive fraction; liquid coatings; contact-angle measurement; surface free energy; optical measurement; non‑Newtonian limitation.

FAQ

Q: What is this standard?

A: ISO 19403‑5:2024 is an international standard that specifies an optical contact‑angle based method to determine the polar and dispersive components of the surface tension of liquids using a solid reference with only a dispersive surface‑energy contribution. It is part of the ISO 19403 series on wettability.

Q: What does it cover?

A: It covers the measurement principle, required test arrangement and calculation approach for separating polar and dispersive surface tension fractions from contact‑angle measurements on a dispersive reference solid, and it notes applicability limits for non‑Newtonian liquids.

Q: Who typically uses it?

A: Coating formulators, surface scientists, test laboratories, R&D groups and quality control personnel who need standardised methods to characterise liquid coating materials and to compare wettability and interfacial properties.

Q: Is it current or superseded?

A: ISO 19403‑5:2024 (Edition 2) is the current published version (published 18 October 2024) and replaces the earlier ISO 19403‑5:2017 edition.

Q: Is it part of a series?

A: Yes. It is one part of the multipart ISO 19403 series on paints and varnishes — wettability, which provides vocabulary, general principles and multiple measurement methods for contact angle, surface free energy and surface tension (see parts 1–7 and related documents).

Q: What are the key keywords?

A: Wettability; contact angle; surface tension; polar fraction; dispersive fraction; liquid coatings; optical measurement.