TS EN ISO 19403-4
Paints and varnishes - Wettability - Part 4: Determination of the polar and dispersive fractions of the surface tension of liquids from an interfacial tension
This document specifies a test method to determine the polar and dispersive fraction of the surface tension of liquids with optical methods. The method can be applied for the characterization of liquid coating materials, especially when drying effects occur during measurement. The applicability can be restricted for liquids with non-Newtonian rheology1).
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About This Item
TS EN ISO 19403-4 is part of the ISO 19403 series on wettability in paints and varnishes, and it specifies an optical test method for determining the polar and dispersive fractions of a liquid’s surface tension from interfacial tension data. This matters in coating technology because wetting influences how a coating spreads, adheres, and ultimately forms a continuous film on a substrate.
What the measurement represents
In general technical terms, surface tension is tied to the energetic state of a liquid surface, while the polar and dispersive fractions describe how that total energy is distributed across different kinds of molecular interactions. Polar interactions are associated with directional forces such as dipole-related effects, whereas dispersive interactions reflect broader London-type attraction forces. Distinguishing these components helps explain why a formulation wets one surface better than another.
Why this part matters in practice
According to the document’s scope, the method is applicable to the characterization of liquid coating materials, especially where drying effects occur during measurement. It also notes that applicability may be restricted for liquids with non-Newtonian rheology. In other words, this part focuses on quantifying surface-property components by optical means rather than making a general claim about overall coating performance.
- Publication Date: 19.03.2020
- Standard Status: H (İptal Edilmiş Standard/Withdrawn standard)
- Publisher: TSE
- Document Language: en
- ICS Classification: 01.040.87 Boya Sanayi (Terimler)
- Pages: 20
- Source Standard: EN ISO 19403-4:2020
- International Equivalents:
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