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DeFelsko Coating Thickness and Inspection Instruments

How to Ensure Accurate Dry Film Thickness Readings

This article appeared in the July 2016 issue of JPCL (Journal of Protective Coatings & Linings)

Hand held dry film thickness (DFT) gages are common inspection tools used by applicators and inspectors. With a little care and maintenance, mechanical and electronic instruments can be relied upon to give many years of accurate and dependable service. This article covers 10 important things users should know.

Replica Tape - Relating 3 Surface Profile Parameters to Pull-Off Adhesion

Winner of the 2016 JPCL Outstanding Publication Award!

This paper reports on recent testing that compared numerous profiles with pull-off adhesion. A simple, low-cost field device (PosiTector RTR) was used to obtain 3 profile parameters from 1 replica tape measurement: profile height, peak density, and developed surface area.

Test surfaces were re-measured with complex, expensive 3D microscopes and results were compared to replica tape results.


Replica Tape – A Source of New Surface Profile Information
Steel surfaces are frequently cleaned by abrasive impact prior to the application of protective coatings.  Various measurement methods are available to coatings professionals including focusing microscopes, surface comparators, depth micrometers and stylus roughness meters. Each one provides a portion of information. It is desirable to obtain the necessary parameters from one practical source. This paper examines replica tape as that possible source.

Surface Profile - A Comparison of Measurement Methods
Coating performance is related to the profile height on a steel surface. This paper presents results from a recent analysis of measurements taken by the three device types (replica tape, depth micrometers fitted with pointed probes, and stylus roughness testers) on steel blasted with an assortment of blast media and proposes a new method of depth micrometer measurement called average of the maximum peaks.

Using Ultrasonic Coating Thickness Gages
Coating thickness gages which use the ultrasonic principle are becoming increasingly popular. This article describes the working principle and benefits ultrasonic testing has brought to the table.

Rough-Surface Measurement Set-up using the “GATE” feature on a PosiTector 200 B/Std
To eliminate surface roughness interference, the PosiTector 200’s menu is used to alter the default “Gate” settings. This article provides step by step instructions.
Coating Thickness Measurement
A variety of recognized methods can be used to determine the thickness of organic coatings. The method employed in a specific situation is most often determined by the type of coating and substrate, the thickness range of the coating, the size and shape of the part, and economics...


Multi-Layer Measurement Set-up on a PosiTector 200 B/Adv
When measuring a coating application for the first time, it is best not to guess at the number of layers. Instead, measure the total thickness first and examine the graphical display. This article provides a two-step process for adjusting the instrument for multi-layer applications.
Looking After Your Coating Thickness Gage
David Beamish of DeFelsko Corporation discusses the maintenance of electronic coating thickness gages as published in the April 2005 JPCL and PCE magazines.
Finish Coatings System Adhesion and Test Methods
Phil Stevenson (founder of the American Wood Finishing Institute) discusses finish coatings system adhesion and test methods in this December 2003 Wood Digest's Finishing article.
Coating Adhesion Testing in Accordance with ASTM D4541 - Sticky Business
Marc Schilling of Corrosion Probe Inc. discusses the complexities of adhesion testing in relation to ASTM D4541 in this April 2004 JPCL article.
Role of Adhesives in Adhesion Testing Process
The primary focus of this technical note is to document the importance of adhesive selection, preparation and application to ensure strong bonding at the dolly-adhesive and coating-adhesive interfaces.
Dolly Preparation for Pull-Off Adhesion Testing
This articles focuses on the dolly preparation process and its importance in maximizing repeatability by ensuring a strong bond at the dolly-adhesive interface.

Measurement Terms - Coating Thickness Gages
This discussion provides definitions, explanations, limitations and practical examples of metrology terminology as it relates to DeFelsko Coating Thickness Measurement gages.

Calibration Terms - Coating Thickness Gage
This discussion provides definitions, explanations, limitations and practical examples of metrology terminology as it relates to DeFelsko Coating Thickness Measurement gages.

Test Methods for Coating Adhesion
For coatings to perform satisfactorily, they must adhere to the substrates on which they are applied. A variety of recognized methods can be used to determine how well a coating is bonded to the substrate.

Measuring Environmental Conditions
Optimal environmental conditions are essential for surface preparation, application, and curing of coatings and linings to maximize successful performance. This article presents the five environmental conditions that should be observed and measured and the effect each condition has on a successful job.


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