ISO 19403-3:2017 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 19403-3:2017

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

Document status:: Withdrawn
Format:: Electronic (PDF)
Number of pages:: 12
Publication date:: June 28, 2017
Edition:: ISO IS 19403 edition 1 version 1
ICS:: 01.040.87

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Description (English):

ISO 19403-3:2017 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. The applicability can be restricted for liquids with non-Newtonian rheology[1]. NOTE For other methods to determine the surface tension, see e.g. EN 14370 and ISO 1409. [1] This term is defined in DIN 1342-1.

Technical details

Technical committee: ISO/TC 35/SC 9 - General test methods for paints and varnishes
SKU: ISO 19403-3:2017

Abstract

Overview

ISO 19403-3:2017 specifies an optical test method for measuring the surface tension of liquids used in paints and varnishes by the pendant drop method (drop contour analysis). The standard defines the principle (Young–Laplace equation), required apparatus, sampling, test conditions and evaluation criteria for characterizing liquid coating materials. The method is widely used in wettability and surface-energy assessments but can be restricted for non‑Newtonian liquids.

Key Topics and Requirements

Principle: Surface tension is calculated from the shape of a pendant drop using the Young–Laplace equation and drop contour analysis.
Apparatus: State-of-the-art drop contour analysis system with digital image capture, dosing unit and circular‑cylindrical needle. Needle outside diameter range: 0.5 mm to 2.5 mm (selected based on the quotient σ/Δρ).
Imaging & lighting: Optimize camera zoom and brightness; recommended grey values near interface ≤ 40 (of 256) and outside drop 170–200 for best contrast.
Calibration & inputs: Enter local acceleration of gravity into the device software; measure liquid and ambient phase densities (ISO 2811) to determine Δρ.
Test conditions: Conduct tests at 23 ± 2 °C and 50 ± 5 % RH and ensure sample thermal equilibrium.
Sample handling: Take representative samples per ISO 15528 and avoid contamination/bubbles during dosing.
Evaluation criteria: Axial symmetry of the drop is mandatory. Key quality metrics:
- Shape parameter B should be within 0.60 ± 0.06.
- Fit error (deviation between measured and calculated contour) should be **

Related standards

Mentioned in the description and other ISO standards

Overview

Key Topics and Requirements

Principle: Surface tension is calculated from the shape of a pendant drop using the Young–Laplace equation and drop contour analysis.
Apparatus: State-of-the-art drop contour analysis system with digital image capture, dosing unit and circular‑cylindrical needle. Needle outside diameter range: 0.5 mm to 2.5 mm (selected based on the quotient σ/Δρ).
Imaging & lighting: Optimize camera zoom and brightness; recommended grey values near interface ≤ 40 (of 256) and outside drop 170–200 for best contrast.
Calibration & inputs: Enter local acceleration of gravity into the device software; measure liquid and ambient phase densities (ISO 2811) to determine Δρ.
Test conditions: Conduct tests at 23 ± 2 °C and 50 ± 5 % RH and ensure sample thermal equilibrium.
Sample handling: Take representative samples per ISO 15528 and avoid contamination/bubbles during dosing.
Evaluation criteria: Axial symmetry of the drop is mandatory. Key quality metrics:
- Shape parameter B should be within 0.60 ± 0.06.
- Fit error (deviation between measured and calculated contour) should be **

ISO 19403-3:2017 PDF

Technical details

Abstract

Overview

Key Topics and Requirements

Related standards

Abstract

Overview

Key Topics and Requirements

Related standards

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

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

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