TS EN ISO 19403-2

TS EN ISO 19403-2 focuses on a test method for determining the surface free energy of solid surfaces by measuring the contact angle, within the field of paints and varnishes. In practical terms, it describes an approach used to characterise substrates and coatings by observing how a liquid interacts with a solid surface.

Why contact angle matters in surface characterisation

In general technical terms, the contact angle is a basic indicator of wettability: it shows how far a liquid drop spreads on a surface. A lower contact angle is commonly associated with better spreading and higher wettability, while a higher angle suggests a less wettable surface. Surface free energy expresses a solid surface’s tendency to interact with other materials and is important for coating adhesion, printing, bonding and related surface-treatment decisions.

Typical contexts for use

• Comparing the pre-coating condition of substrates
• Assessing wettability differences in coated surfaces
• Providing a basis for calculating surface free energy from contact angle data
• Supporting understanding of surface preparation and application behaviour in paint and varnish systems

This TSE record represents a withdrawn edition of the standard. Its subject is a contact-angle-based test method and its use in surface free energy evaluation; it should be understood as a technical measurement standard rather than a standalone guarantee of product suitability.