ISO 19403-7-2024 PDF

Full title and description

Paints and varnishes — Wettability — Part 7: Measurement of the dynamic contact angles and the roll-off angle on a tilt stage. This International Standard specifies a method to measure the roll-off angle of a liquid drop on an inclined substrate and the dynamic advancing and receding contact angles of a drop while it is rolling off, for evaluation of easy‑to‑clean and anti‑adherent surfaces.

Abstract

This document describes a dynamic measurement technique using a tilt (inclined) stage to determine the roll-off (tilt) angle of a liquid droplet on a solid surface and to obtain the dynamic advancing and receding contact angles during roll‑off. The method is intended for characterization of substrate wettability relevant to coatings, surface treatments and easy‑to‑clean applications.

General information

• Status: Published
• Publication date: October 2024
• Publisher: International Organization for Standardization (ISO)
• ICS / categories: 87.040 — Paints and varnishes; surface properties (wettability)
• Edition / version: Edition 2 (2024)
• Number of pages: 13

Key bibliographic details and lifecycle: edition 2 published in 2024; replaces the withdrawn 2017 edition.

Scope

Specifies a laboratory method for dynamic measurement of the roll‑off angle on an inclined stage and the associated dynamic advancing and receding contact angles of a liquid drop as it moves on a solid surface. The procedure is applicable to the evaluation of surfaces where roll‑off behavior is relevant (for example easy‑to‑clean and anti‑adherent surfaces) and is intended for use with coatings, treated substrates and similar materials. It does not cover every possible substrate morphology or non‑liquid media; users should consider material homogeneity and test conditions when applying the method.

Key topics and requirements

• Definition and measurement of roll‑off (tilt) angle using an inclined/tilt stage.
• Determination of dynamic advancing and receding contact angles for a drop during roll‑off.
• Requirements for test specimen preparation, droplet volume, liquid selection and environmental conditions to ensure repeatability.
• Instrumentation and calibration guidance for tilt stages and contact angle measurement systems.
• Data reporting and interpretation for roll‑off behavior and dynamic contact angles (useful in assessing easy‑clean and anti‑adhesive performance).

Typical use and users

Used by laboratories, coating manufacturers, surface engineers, R&D teams, quality control personnel and third‑party testing bodies to quantify dynamic wettability and roll‑off behavior of coated or treated surfaces. Typical applications include development and verification of easy‑to‑clean coatings, hydrophobic and oleophobic surface treatments, surface quality control, and comparative research on substrate/coating systems.

Related standards

Part of the ISO 19403 series on wettability and surface characterization. Related parts include methods for surface free energy and contact angle measurement (e.g., ISO 19403‑2 and ISO 19403‑3) and other test methods for liquids and substrates within the same technical committee scope. Users commonly consult other parts of ISO 19403 for complementary methods (surface free energy, pendant drop, static contact angles).

Keywords

wettability, roll‑off angle, tilt stage, dynamic contact angle, advancing contact angle, receding contact angle, paints and varnishes, surface characterization, easy‑to‑clean, hydrophobicity

FAQ

Q: What is this standard?

A: An ISO test method (ISO 19403‑7:2024) that specifies how to measure the roll‑off angle of a droplet on an inclined surface and how to determine dynamic advancing and receding contact angles during roll‑off.

Q: What does it cover?

A: It covers the dynamic measurement procedure on a tilt/ inclined stage, instrument and test‑condition recommendations, droplet handling and data reporting required to assess roll‑off behavior and dynamic contact angles for coated or treated solid surfaces.

Q: Who typically uses it?

A: Coating formulators, surface treatment developers, quality control labs, independent testing bodies and researchers working on surface wettability, hydrophobic/oleophobic finishes and easy‑to‑clean surfaces.

Q: Is it current or superseded?

A: Current — ISO 19403‑7 was republished in 2024 (edition 2) and replaces the earlier 2017 edition.

Q: Is it part of a series?

A: Yes — it is one part of the ISO 19403 series addressing wettability and related measurement methods for coatings, liquids and solid surfaces; consult other parts of ISO 19403 for complementary test methods.

Q: What are the key keywords?

A: Wettability; roll‑off angle; dynamic contact angle; tilt stage; advancing/receding contact angle; paints and varnishes; surface free energy; easy‑to‑clean.