PaintSquare.com
      | Connect Follow us on Twitter Like us on Facebook
About | Subscribe | Advertise
  

 

Download our free Bridge Coating Systems eResource Book

Problem Solving Forum

| More

August 19 - August 25, 2013

Where are errors most likely to occur when measuring dry film thickness on steel, and how can they be avoided?



More items for Quality Control


Selected Answers

From Christian Favennec of DCNS on April 23, 2014:
When a dry film thickness (DFT) is specified, it corresponds to the thickness of the paint over the peaks of the profile. DFT measurements on steel are generally performed with electromagnetic gauges. Parameters which can influence on the accuracy of the measurement include the profile of the substrate. If the calibration is done on a smooth plate, the profile of the surface s not taken into account in the measurement. ISO 19840 recommends a correction value (25 µm for medium profile, 40 µm for coarse profile). It means that if the NDFT is 100µm, the measurement must be done for 125 µm for a medium profile. The other method is to perform the calibration directly on the rough surface before paint application with the 2-points method, as also defined in the annex of ISO 19840. The profile is then correctly taken into account.  The magnetic properties of the steel can also influence the measurement. It is then recommended to perform the calibration on the same quality of steel, and a representative thickness. Edge effect cans also influence the measurement. This is why measurements are generally not performed less than 20 mm from an edge.  Ferritic or magnetic pigments in the paint can also influence the measurement, as the calibration is done on non-magnetic foils.

From PARVEZ SHAIKH of SANDVIK ASIA PVT. LTD. on August 2, 2013:
When calculating the DFT of a primer over a blasted surface, one has to ensure that the DFT meter is calibrated on the blasted surface itself to compensate for the BMR over the blasted surface. Also, the thickness measurement of coatings containing  micaceous iron oxide are sometimes not accurate.

Please sign in to submit your answer this question    

Tagged categories: Dry Film Thickness (DFT); Steel


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

KTA-Tator, Inc. - Corporate Office
KTA-TATOR LABORATORY SERVICES

• Coating failure analysis
• Independent
  comparative testing
• Accelerated
  weathering testing
• Toxic metals testing
• A2LA Accredited
800-245-6379


Fischer Technology Inc.
DUALSCOPE®FMP100 with DataCenter IP

Transfer customized inspection plans from PC to FMP100 using step-by-step guidance with prompts and pictures throughout the measurement procedure


SSPC: The Society for Protective Coatings
http://www.sspc.org/

Join SSPC and Enhance
Your Career !


Elcometer, Inc.
Elcometer 106 Pull-Off Adhesion Tester

Portable, easy to operate; Provides numerical value for adhesion; Comes in carrying case - Ideal for site tests; No power supply necessary.


DeFelsko Corporation
PosiTector 200 for concrete

Rugged, simple and affordable coating thickness gage for concrete measures protective coatings including polyurea.


Specialty Products, Inc. (SPI)
SIGN UP TODAY – HANDS ON TRAINING

After 40 years in the coating business, SPI has trained more industry professionals than any other polyurea manufacturer. Now offering more classes at more locations than ever before!


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.


Carboline Company
Fireproofing Solutions

Pyroclad® X1 Thermo-Lag® Pyrocrete® – protecting against hydrocarbon and jet fires, explosions, and cryogenic spills.


HoldTight Solutions Inc.
NO FLASH RUST -
NO CONTAMINANTS

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 sales@holdtight.com


Novetas Solutions
Number 1 Crushed Glass Abrasive in America!

Manufactured from 100% Recycled Glass.
NO Crystalline Silica,
Beryllium & Arsenic
Great White Metal Finish!
4 plants on Navy QPL
Call us at 866-775-6226

 
 
 
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 PaintSquare.com   |   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 webmaster@paintsquare.com