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AS 3894.3-2002


Site testing of protective coatings, Method 3: Determination of dry film thickness

This Standard provides practical test methods for the on-site determination of the range of thicknesses and the mean dry film thickness of a protective coating system, or its component coats, upon a metallic structure or fabrication. The coated fabrications to which the methods may be applied include tanks or reservoirs, bridge girders, equipment used in processing chemicals or petroleum, pipelines, and articles such as vehicles, white goods and other items of industrial production, where there is lack of uniformity of substrate thickness, metallographic character, surface condition and the film of the protective coating.
Published: 07/06/2002
Pages: 27
Table of contents
Cited references
Content history
Table of contents
About this publication
1 Scope
2 Referenced documents
3 Definitions
4 Test methods
5 Precautions
6 Inspection period
7 Inspection plans
7.1 General
7.2 Point reading
7.3 Large surface areas
7.4 Small surface areas
7.5 Statistical sampling
8 Inspection objectives
8.1 General
8.2 Severe environment
8.3 Atmospheric exposure
8.4 Large numbers of small components
9 Magnetic instrument method—Method A
9.1 Scope
9.2 Principle
9.3 Apparatus
9.3.1 Calibration Standards
9.3.2 Magnetic pull‑off instrument
9.4 Preparation of test surface
9.5 Precautions
9.5.1 General
9.5.2 Reproducibility
9.5.3 Vibration
9.5.4 Measuring
9.5.5 Probe position
9.6 Procedure
9.7 Report
10 Magnetic induction and eddy current methods—Method B
10.1 Scope
10.2 Application
10.3 Principle
10.4 Apparatus
10.5 Preparation of test surface
10.6 Precautions
10.7 Procedure
10.8 Report
Appendix A
A1 Scope
A2 Principle
A3 Apparatus
A4 Preparation of test specimens
A4.1 General
A4.2 Mounting of test specimen (see Note 1)
A4.3 Grinding and polishing
A5 Procedure
A6 Report
Appendix B
B1 Scope
B2 Principle
B3 Apparatus
B3.1 Optical microscope
B3.2 Camera
B4 Preparation of the test specimen
B5 Procedure
B6 Report
Appendix C
C1 Scope
C2 Principle
C3 Apparatus — Comb gauge
C4 Procedure
C5 Estimation of dry film thickness
C6 Report
Appendix D
D1 Scope
D2 General
D3 Calibration Standards
D3.1 General
D3.2 Primary standards
D3.3 Secondary standards
D4 Reference substrates
D5 Procedure
D5.1 General
D5.2 Magnetic pull‑off gauges
D5.3 Magnetic induction and eddy current instruments
Appendix E
Cited references in this standard
Glossary of paint and painting terms
Metal finishing — Recommended sampling plans for the inspection and testing of coatings (ISO 4519:1980, MOD)
AS/NZS 1580.108.2
Paints and related materials—Methods of test, Method 108.2: Dry film thickness—Paint inspection gauge
Guide to AS 1199 — Sampling procedures and tables for inspection by attributes
Guide to the protection of structural steel against atmospheric corrosion by use of protective coatings
Content history
DR 01387
AS 3894.3-2002 Rec:2013
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