Problem Solving Forum

| More

October 16 - October 23, 2015

How does the concave or convex curvature of a surface affect the dry film thickness reading?


Selected Answers

From Michael Halliwell of Thurber Engineering Ltd. on October 23, 2015:
I think it will also depend on how ham-fisted the person doing the application is, how thick/heavy and "wet" the coating is and the radius of the curvature. It is at least theoretically possible to have variations in the thickness due to the curvature (i.e. minor coating flow at high slopes). As noted, the probe makes a difference, too. Overall, there could be some variation, but a good application and  using an instrument intended for tighter curves should minimize it.

From Tom Swan of M-TEST on October 23, 2015:
If you are using a Type 2 (electronic) gauge and you calibrate the gage to the surface being measured, how concave or convex the surface is does not effect the accuracy. With a Type 1 gauge, it will effect the readings. A convex surface will flatten out the magnetic field and a convex cave will cause the magnetic field to arch higher. Even with a bowling ball, if you zero to the same conditions you are measuring, it should not effect the accuracy. Just don't measure too close to the finger holes.

From David Zuskin of Indepedent on October 23, 2015:
If you use a mini probe or micro probe, there should be no effect.

From Warren Brand of Chicago Coatings Group on October 20, 2015:
It will depend on the angle of the curved surface. Either way, using a type 2 pencil gauge should give you an accurate reading unless the surface is curved like a bowling ball or other severe curve, in which case you may, if the full tip of the pencil is not able to come into full contact with the surface,  get readings which are inaccurate.

Please sign in to submit your answer this question    

Tagged categories: Coating / Film thickness; Dry Film Thickness (DFT); Quality control


Current PSF Question | Submit a PSF Question | Full PSF Archive

Advertisements
 
Fischer Technology Inc.

 
KTA-Tator, Inc. - Corporate Office

 
DeFelsko Corporation

 
ABKaelin, LLC

 
SAFE Systems, Inc.

 
HoldTight Solutions Inc.

 
Sauereisen, Inc.

 
AWWA (American Water Works Association)

 
WEFTEC Show

 
Tarps manufacturing, Inc.

 
 
 

Technology Publishing Co., 1501 Reedsdale Street, Suite 2008, Pittsburgh, PA 15233

TEL 1-412-431-8300  • FAX  1-412-431-5428  •  EMAIL webmaster@paintsquare.com


The Technology Publishing Network

PaintSquare the Journal of Protective Coatings & Linings 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 PaintSquare.com   |   Privacy Policy   |   Terms & Conditions   |   Support   |   Site Map   |   Search   |   Contact Us