TS EN ISO 19403-1

TS EN ISO 19403-1 is the standard that gathers the terms and definitions used for wettability in paints and varnishes, providing a common technical language for this subject. Wettability concerns how a liquid spreads on, adheres to, and covers a solid surface, making it an important concept in coating performance, surface preparation, and the interpretation of film behaviour.

Technical scope of the wettability vocabulary

The main purpose of this document is to organise the general terms and definitions used in the field of wettability. In practice, that means concepts such as contact angle, surface energy, spreading, and related ideas are understood within a consistent framework. The standard is not presented here as introducing a new test method; rather, it establishes terminology that supports clear communication and consistent interpretation across laboratory reports, product data sheets, and technical discussions.

General principles and related terminology

Annex A includes some general principles concerning wettability. The document is also intended to be used together with ISO 4618, so it should be read in the broader terminology context of paints and varnishes. This alignment helps keep the concepts used to describe liquid–surface interactions clear and consistent, especially in coating systems where wetting behaviour influences application and film formation.

• Defines the core terms used to describe liquid behaviour on surfaces.
• Provides shared terminology for the paints and varnishes domain.
• Is intended for use in conjunction with ISO 4618.
• Includes general principles in Annex A.