ISO 19403-3:2024
Paints and varnishes — Wettability — Part 3: Determination of the surface tension of liquids using the pendant drop method
This document specifies a test method to measure the surface tension of liquids with an optical method using the pendant drop. The method can be applied for the characterization of liquid coating materials. If applied to liquids with non-Newtonian flow behaviour (as defined in ISO 3219-1:2021, 3.22), restrictions can apply.
NOTE For other methods to determine the surface tension, see e.g. EN 14370 and ISO 1409.
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Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 Principle
5 Apparatus and materials
6 Sampling
7 Procedure
7.1 General
7.1.1 Setting up the drop contour analysis device
7.1.2 Test conditions
7.2 Determination of the surface tension of the liquid
7.2.1 Preparations
7.2.2 Procedure
8 Evaluation
9 Precision
9.1 General
9.2 Repeatability limit, r
9.3 Reproducibility limit, R
10 Test report
Annex A (informative) Density of test liquids
Annex B (normative) Shape parameter, B, and Worthington number
Annex C (informative) Details of an interlaboratory test
Bibliography
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Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 Principle
5 Apparatus and materials
6 Sampling
7 Procedure
7.1 General
7.1.1 Setting up the drop contour analysis device
7.1.2 Test conditions
7.2 Determination of the surface tension of the liquid
7.2.1 Preparations
7.2.2 Procedure
8 Evaluation
9 Precision
9.1 General
9.2 Repeatability limit, r
9.3 Reproducibility limit, R
10 Test report
Annex A (informative) Density of test liquids
Annex B (normative) Shape parameter, B, and Worthington number
Annex C (informative) Details of an interlaboratory test
Bibliography