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

 

Download our free ebook on Advances in Corrosion Control Coating Technology

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

DeFelsko Corporation
PosiTector Inspection Kits

PosiTector 6000 Coating Thickness Gage easily converts to a surface profile gage, dew point meter or ultrasonic wall thickness gage with a simple probe change


HoldTight Solutions Inc.
NO FLASH RUST - NO CONTAMINANTS

Our HoldTight®102 salt remover & flash rust
preventer prevents flash
rust by removing surface contaminants. Contact us
for your nearest distributor.
(800) 319.8802 sales@holdtight.com


Desco Mfg. Co., Inc.

Dust - Free Surface Prep
Made EASY!

Efficient-Fast clean/remove
Advanced Containment
Safe - Well Below OSHA
Yes! - Innovative Solutions!
DESCO Mfg.Co., Inc.
www.descomfg.com
800-337-2648


N.T. Ruddock Co.

Our Abrasives Hold Up Under Pressure

N. T. Ruddock focuses on abrasive selection, equipment evaluation, equipment maintenance & reduction of abrasive consumption. Other services include Screen Analysis & Background Radiation Testing.


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

• Coating failure analysis
• Independent
  comparative testing
• Accelerated
  weathering testing
• Toxic metals testing
• A2LA Accredited
Contact: Cindy O'Malley,
at 412-788-1300 x180


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


NACE
Keep your records straight!

For use in the field, with step-by-step job-specific entry spaces for the entire coating or lining project; also available in condensed version. Get it today!


Clemco International GmbH
Global engineering-trusted solutions

For more than 70 years, Clemco has provided the highest quality blast equipment with a total commitment to comfort and safety.


Hempel (USA) Inc.
Hempel Protective Coatings

Protect your investment from the inside out. With IMO, PSPC approved tank coatings solutions we give you tough, long lasting results that are tailored to meet your exact needs. Contact us at offshore@hempel.com today.


Safway Services
Safeguard Assets. Ensure Productivity. HAKI®

Protect assets and equipment. Keep facilities open and operational. Maintain schedules regardless of weather. Ensure smooth and continuous production. Easy to erect. Safway is the primary distributor of HAKI® products including HAKISPAN and HAKITEC® 750 – in North America.

 
 
 
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 2000-2016, 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