| Connect Follow us on Twitter Like us on Facebook
About | Subscribe | Advertise


Download our free Wastewater Treatment Coating Systems eResource Book

Paint and Coatings Industry News

Main News Page

Free How-to: Cutting into Coatings

Monday, August 4, 2014

More items for Quality Control

Comment | More

Sometimes being destructive is the only way to get it done—at least when it comes to measuring each layer in a coating system, according to a new how-to video that covers the basics of the Tooke Gage.

"Destructive Testing of Paint and Coatings for Dry Film Thickness" is the newest addition to the instructional PaintSquare Video Learning Center series, which delves into multiple aspects of protective coatings work.

PaintSquare Video Learning Series
Images: KTA-Tator Inc.

"Destructive Testing of Paint and Coatings for Dry FIlm Thickness" is the newest installment in the PaintSquare Video Learning Center series.

Created and narrated by experts at KTA-Tator Inc., the Video Learning series covers a wide range of topics in protective coatings work, from quality-control and health and safety issues, to basics on the proper use of coatings instruments.

From Lead Detection to Ventilation

Previous titles in the series include:

The series of short video segments includes "Concrete Cleanliness."

Future topics in the series include adhesion, holiday detection, steel surfaces and moisture testing.

Each installment is available free in the PaintSquare Video Learning Center.

Measuring Thickness

In this video (3:04), KTA's Ken Trimber discusses the Tooke Gage and its use in destructive testing of coatings for dry film thickness measurement.

While coating thickness is commonly measured using non-destructive gages, those methods can have significant limitations, Trimber explains. For example, most can only be used on metallic substrates and cannot distinguish between coating layers.

The Tooke Gage is used when there is a need to measure individual coating layers, which if often necessary for troubleshooting, questions about the thickness of an underlying coat, or failure analysis.

Trimber talks briefly about the history of the Tooke Gage, and explains the components of the tool.

'Basic Trigonometry'

The Tooke Gage is destructive because it makes an incision or groove about the width of a pencil line through the coating film down to the substrate, Trimber says.

The Tooke Gage makes an incision through the entire coating system down to the substrate. The gage is unaffected by substrate type, base metal, and surface profile.

The gage measures coating thickness using basic trigonometry, by cutting a precision V-groove into the system, creating a right triangle.

But you don't have to know trigonometry or calculate the angle—tool does all the work for you.

Consistency is Key

While the gage is unaffected by the type of substrate, the base metal, or the surface profile, the top of the coating does have to be relatively smooth.

"For example, if you're looking at thickness on a concrete block, the results may be inaccurate if that block has a rough texture because the cutting angle will vary," Trimber says. 

"And in order to get the proper thickness, the angle has to be consistent."

According to Trimber, the Tooke Gage conforms to ASTM D4138, "Standard Practices for Measurement of Dry Film Thickness or Protective Coating Systems by Destructive, Cross-Sectioning Means."


Tagged categories: Dry Film Thickness (DFT); Education; KTA-Tator; Online tools; PaintSquare; Thickness gauge; Video

Comment Join the Conversation:

Sign in to our community to add your comments.

Elcometer, Inc.
Elcometer 266
DC Holiday Detector

Easily Finds Pinholes, Flaws & Thin Spots; Safer, More Reliable Testing; Voltage-Adjustable Keypad; Dual-Safety Switch On Handle.

HoldTight Solutions Inc.

Our HoldTight®102 salt remover & flash rust preventer prevents flash
rust by removing surface contaminants. It has no equal; only wannabees.
Contact us for your
nearest distributor.
(800) 319.8802

KTA-Tator, Inc. - Corporate Office
Coatings Inspection

Any structure, any height, any place - A qualified coatings inspector is always available. Call 1-800-245-6379.

Nationwide Overspray
Profession Overspray Removal Services

The Finest Name in Safe Overspray Removal. We specialize in removing all contaminants from any surface. Family Owned and Operated for 33 years! Fully insured. Satisfaction is guaranteed.

Fischer Technology Inc.
Measure TSA Coatings on Stainless Steel

The PHASCOPE® PMP10 from FISCHER precisely measures thermally sprayed aluminum (TSA) on stainless steel.

DeFelsko Corporation
A Smart New Way to Measure

PosiTector SmartLink and free mobile app turns your cell phone or tablet into a virtual PosiTector gage.

Oxford Instruments Coating Measurement

Clemco Industries Corp.
Powerful Protection in a Small Package

Mounts inside blast helmet, alerts operator to dangerous breathing-air condition by audible, visual, and vibratory alarms. Easily calibrated, battery operated.

CS Unitec
Peening Preparation Tools

CS Unitec’s hand-held scarifiers are an ideal alternative to small-area shot blasting for cleaning and preparing concrete & metal surfaces.

NLB Corporation
VacLance cleans up as you do surface preparation

Add vacuum recovery to any NLB rotating water jet lance with a VacLance attachment and vacuum source. Model DM32283 works vertically, horizontally and in corners.

Technology Publishing

The Technology Publishing Network

The Journal of Protective Coatings & Linings (JPCL) PaintSquare
Durability + Design Paint BidTracker

EXPLORE:      JPCL   |   PaintSquare News   |   Interact   |   Buying Guides   |   Webinars   |   Resources   |   Classifieds
REGISTER AND SUBSCRIBE:      Free PaintSquare Registration   |   Subscribe to JPCL   |   Subscribe to PaintSquare News
MORE:      About   |   Privacy policy   |   Terms & conditions   |   Site Map   |   Search   |   Contact Us

© Copyright 2000-2015, Technology Publishing / PaintSquare, All rights reserved
2100 Wharton Street, Suite 310, Pittsburgh PA 15203-1951; Tel 1-412-431-8300; Fax 1-412-431-5428; E-mail