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Evaluation of Applied Film Thickness for Polyurea Thick-Film Elastromeric Coating/Lining Systems

Evaluation of Applied Film Thickness for Polyurea Thick-Film Elastromeric Coating/Lining Systems
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In the application of coating / lining systems, applied film thickness is an important aspect in the execution of the project. Specifications call for a required minimum film build, not to verify material use, but because it relates to the overall performance of the project. Knowing the applied film thickness of the coating / lining system as the job proceeds also helps determine if one has obtained sufficient material to successfully complete the application work as specified. 

Product Number: 41209-501-SG
Author: Dudley J. Primeaux II, Kelin Bower
Publication Date: 2009
Industry: Coatings
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In the application of coating / lining systems, applied film thickness is an important aspect in the execution of the project. Specifications call for a required minimum film build, not to verify material use, but because it relates to the overall performance of the project. Knowing the applied film thickness of the coating / lining system as the job proceeds also helps determine if one has obtained sufficient material to successfully complete the application work as specified. Traditional wet film thickness measurements used in coating / lining work may not readily apply to the polyurea technology. This is due to the unique characteristics of the polyurea technology, primarily the fast cure / set of the system. Other forms of cured film thickness measurement are then required for polyurea elastomeric coating / lining systems. These methods may either be destructive or non-destructive to the continuous membrane. Destructive methods used will require repair of that area tested. Non-destructive methods may require the use of highly expensive and delicate test equipment. But either way, monitoring applied film thickness is a part of quality and can help insure a successful polyurea coating / lining project. This paper will take a look at the various applied film thickness measurement techniques and how they relate to the polyurea elastomer coating / lining technology. Specifically, this paper will focus on ASTM D 6132: “Standard Test Method for Nondestructive Measurement of Dry Film Thickness of Applied Organic Coatings Using an Ultrasonic Gage” and the new SSPC Paint Application Specification No. 9: Measurement of Dry Coating Thickness on Cementicious Substrates Using Ultrasonic Gages.

In the application of coating / lining systems, applied film thickness is an important aspect in the execution of the project. Specifications call for a required minimum film build, not to verify material use, but because it relates to the overall performance of the project. Knowing the applied film thickness of the coating / lining system as the job proceeds also helps determine if one has obtained sufficient material to successfully complete the application work as specified. Traditional wet film thickness measurements used in coating / lining work may not readily apply to the polyurea technology. This is due to the unique characteristics of the polyurea technology, primarily the fast cure / set of the system. Other forms of cured film thickness measurement are then required for polyurea elastomeric coating / lining systems. These methods may either be destructive or non-destructive to the continuous membrane. Destructive methods used will require repair of that area tested. Non-destructive methods may require the use of highly expensive and delicate test equipment. But either way, monitoring applied film thickness is a part of quality and can help insure a successful polyurea coating / lining project. This paper will take a look at the various applied film thickness measurement techniques and how they relate to the polyurea elastomer coating / lining technology. Specifically, this paper will focus on ASTM D 6132: “Standard Test Method for Nondestructive Measurement of Dry Film Thickness of Applied Organic Coatings Using an Ultrasonic Gage” and the new SSPC Paint Application Specification No. 9: Measurement of Dry Coating Thickness on Cementicious Substrates Using Ultrasonic Gages.

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