ISO 19403-3:2024 PDF

Paints and varnishes — Wettability — Part 3: Determination of the surface tension of liquids using the pendant drop method

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Title (English):

ISO 19403-3:2024

Paints and varnishes — Wettability — Part 3: Determination of the surface tension of liquids using the pendant drop method

Document status:: Active
Format:: Electronic (PDF)
Number of pages:: 11
Publication date:: September 4, 2024
Edition:: ISO IS 19403 edition 2 version 1
ICS:: 87.040

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Description (English):

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.

Technical details

Technical committee: ISO/TC 35/SC 9 - General test methods for paints and varnishes
SKU: ISO 19403-3:2024

Abstract

Overview

ISO 19403-3:2024 - Paints and varnishes - Wettability - Part 3 specifies an optical test method to determine the surface tension of liquids using the pendant drop method. The standard defines how to form and analyse a pendant drop with a drop contour analysis system and to calculate surface tension from the drop shape via the Young–Laplace equation. It is intended mainly for characterization of liquid coating materials; restrictions can apply when testing non‑Newtonian liquids.

Key topics and technical requirements

Method principle: Form a pendant drop on a cylindrical needle and analyse its axisymmetric contour to derive surface tension from Young–Laplace.
Apparatus: State‑of‑the‑art drop contour analysis system (camera, optical system, light source), a dosing unit/micro‑syringe and a needle with outside diameter between 0.5 mm and 2.5 mm (needle choice depends on σ/Δρ).
Sample handling: Representative sampling per ISO 15528; density of liquid and ambient phase measured per the ISO 2811 series.
Test conditions: Conduct at (23 ± 2) °C and (50 ± 5) % RH; enter local gravity value in instrument software.
Image quality & evaluation:
- Axially symmetric drop contour mandatory.
- Shape parameter B recommended to be 0.60 ± 0.06 (Annex B).
- Fit error should be

Related standards

Mentioned in the description and other ISO standards

Overview

Key topics and technical requirements

Method principle: Form a pendant drop on a cylindrical needle and analyse its axisymmetric contour to derive surface tension from Young–Laplace.
Apparatus: State‑of‑the‑art drop contour analysis system (camera, optical system, light source), a dosing unit/micro‑syringe and a needle with outside diameter between 0.5 mm and 2.5 mm (needle choice depends on σ/Δρ).
Sample handling: Representative sampling per ISO 15528; density of liquid and ambient phase measured per the ISO 2811 series.
Test conditions: Conduct at (23 ± 2) °C and (50 ± 5) % RH; enter local gravity value in instrument software.
Image quality & evaluation:
- Axially symmetric drop contour mandatory.
- Shape parameter B recommended to be 0.60 ± 0.06 (Annex B).
- Fit error should be

ISO 19403-3:2024 PDF

Technical details

Abstract

Overview

Key topics and technical requirements

Related standards

Abstract

Overview

Key topics and technical requirements

Related standards

Paints, varnishes and raw materials for paints and varnishes - Sampling (ISO 15528:2020)

Paints and varnishes - Determination of density - Part 3: Oscillation method (ISO 2811-3:2023)

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