ISO 2808:2019
Paints and varnishes — Determination of film thickness
This document describes methods for measuring the thickness of coatings applied to a substrate. Methods for determining wet-film thickness, dry-film thickness and the film thickness of uncured powder layers are described.
For each method described, this document provides an overview of the field of application, existing standards and the precision.
Information on measuring film thickness on rough surfaces is given in Annex B.
Information on measuring film thickness on wooden substrates is given in Annex C.
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Determination of wet-film thickness
4.1 General
4.2 Mechanical methods
4.2.1 Principle
4.2.2 Field of application
4.2.3 General
4.2.4 Method 1A — Comb gauge
4.2.5 Method 1B — Wheel gauge
4.2.6 Method 1C — Dial gauge
4.3 Gravimetric method
4.3.1 Principle
4.3.2 Field of application
4.3.3 General
4.3.4 Method 2 — By difference in mass
4.4 Photothermal method
4.4.1 Principle
4.4.2 Field of application
4.4.3 General
4.4.4 Method 3 — Determination using thermal properties
5 Determination of dry-film thickness
5.1 General
5.2 Mechanical methods
5.2.1 Principle
5.2.2 Field of application
5.2.3 General
5.2.4 Method 4A — By difference in thickness
5.2.5 Method 4B — Depth gauging
5.2.6 Method 4C — Surface profile scanning
5.3 Gravimetric method
5.3.1 Principle
5.3.2 Field of application
5.3.3 General
5.3.4 Method 5 — By difference in mass
5.4 Optical methods
5.4.1 Principle
5.4.2 Field of application
5.4.3 General
5.4.4 Method 6A — Cross-sectioning
5.4.5 Method 6B — Wedge cut
5.4.6 Method 6C — White-light interferometry
5.5 Magnetic methods
5.5.1 Principle
5.5.2 Field of application
5.5.3 General
5.5.4 Method 7A — Magnetic pull-off gauge
5.5.5 Method 7B.1 — Magnetic-flux gauge
5.5.6 Method 7B.2 — Magnetic field change, magnetic-induction principle
5.5.7 Method 7C — Eddy-current gauge
5.6 Radiological method
5.6.1 Principle
5.6.2 Field of application
5.6.3 General
5.6.4 Method 8 — Beta backscatter method
5.7 Photothermal method
5.7.1 Principle
5.7.2 Field of application
5.7.3 General
5.7.4 Method 9 — Determination using thermal properties
5.8 Acoustic method
5.8.1 Principle
5.8.2 Field of application
5.8.3 General
5.8.4 Method 10 — Ultrasonic reflection
5.9 Electromagnetic method
5.9.1 Method 11 — Terahertz method
6 Determination of thickness of uncured powder layers
6.1 General
6.2 Gravimetric method
6.2.1 Principle
6.2.2 Field of application
6.2.3 General
6.2.4 Method 12 — By difference in mass
6.3 Magnetic methods
6.3.1 Principle
6.3.2 Field of application
6.3.3 General
6.3.4 Method 13A — Magnetic-induction method
6.3.5 Method 13B — Eddy-current
6.4 Photothermal method
6.4.1 Principle
6.4.2 Field of application
6.4.3 General
6.4.4 Method 14 — Determination using thermal properties
7 Test report
Annex A (informative) Overview of methods
Annex B (informative) Measurement of film thickness on rough surfaces
Annex C (informative) Factors affecting the precision of readings obtained when measuring on wooden substrates
Bibliography
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Related Information
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Determination of wet-film thickness
4.1 General
4.2 Mechanical methods
4.2.1 Principle
4.2.2 Field of application
4.2.3 General
4.2.4 Method 1A — Comb gauge
4.2.5 Method 1B — Wheel gauge
4.2.6 Method 1C — Dial gauge
4.3 Gravimetric method
4.3.1 Principle
4.3.2 Field of application
4.3.3 General
4.3.4 Method 2 — By difference in mass
4.4 Photothermal method
4.4.1 Principle
4.4.2 Field of application
4.4.3 General
4.4.4 Method 3 — Determination using thermal properties
5 Determination of dry-film thickness
5.1 General
5.2 Mechanical methods
5.2.1 Principle
5.2.2 Field of application
5.2.3 General
5.2.4 Method 4A — By difference in thickness
5.2.5 Method 4B — Depth gauging
5.2.6 Method 4C — Surface profile scanning
5.3 Gravimetric method
5.3.1 Principle
5.3.2 Field of application
5.3.3 General
5.3.4 Method 5 — By difference in mass
5.4 Optical methods
5.4.1 Principle
5.4.2 Field of application
5.4.3 General
5.4.4 Method 6A — Cross-sectioning
5.4.5 Method 6B — Wedge cut
5.4.6 Method 6C — White-light interferometry
5.5 Magnetic methods
5.5.1 Principle
5.5.2 Field of application
5.5.3 General
5.5.4 Method 7A — Magnetic pull-off gauge
5.5.5 Method 7B.1 — Magnetic-flux gauge
5.5.6 Method 7B.2 — Magnetic field change, magnetic-induction principle
5.5.7 Method 7C — Eddy-current gauge
5.6 Radiological method
5.6.1 Principle
5.6.2 Field of application
5.6.3 General
5.6.4 Method 8 — Beta backscatter method
5.7 Photothermal method
5.7.1 Principle
5.7.2 Field of application
5.7.3 General
5.7.4 Method 9 — Determination using thermal properties
5.8 Acoustic method
5.8.1 Principle
5.8.2 Field of application
5.8.3 General
5.8.4 Method 10 — Ultrasonic reflection
5.9 Electromagnetic method
5.9.1 Method 11 — Terahertz method
6 Determination of thickness of uncured powder layers
6.1 General
6.2 Gravimetric method
6.2.1 Principle
6.2.2 Field of application
6.2.3 General
6.2.4 Method 12 — By difference in mass
6.3 Magnetic methods
6.3.1 Principle
6.3.2 Field of application
6.3.3 General
6.3.4 Method 13A — Magnetic-induction method
6.3.5 Method 13B — Eddy-current
6.4 Photothermal method
6.4.1 Principle
6.4.2 Field of application
6.4.3 General
6.4.4 Method 14 — Determination using thermal properties
7 Test report
Annex A (informative) Overview of methods
Annex B (informative) Measurement of film thickness on rough surfaces
Annex C (informative) Factors affecting the precision of readings obtained when measuring on wooden substrates
Bibliography