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Permeability: an in Depth Look at the ASTM’s When the Data can be Important, and When the Information is Irrelevant

Often coatings are judged by certain criteria especially when it comes to immersion service. One of the criteria used to evaluate these coatings is permeability, which is often misunderstood. With 2 ASTM test methods, each with multiple methods and ways to report the results, you may get so much conflicting information that none of the information permeates into your brain in an understandable way. 

Product Number: 51220-285-SG
Author: John Sierzega
Publication Date: 2020
Industry: Coatings
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Often coatings are judged by certain criteria especially when it comes to immersion service. One of the criteria used to evaluate these coatings is permeability, which is often misunderstood. With 2 ASTM test methods, each with multiple methods and ways to report the results, you may get so much conflicting information that none of the information permeates into your brain in an understandable way. Whether specifying a coating for an internal tank lining, or for the exterior of a concrete building, permeability may be on the mind of a specifier. What if the specification is for a steel pipe that sweats, or a coating for an insulated metal panel, will permeability matter?

Often coatings are judged by certain criteria especially when it comes to immersion service. One of the criteria used to evaluate these coatings is permeability, which is often misunderstood. With 2 ASTM test methods, each with multiple methods and ways to report the results, you may get so much conflicting information that none of the information permeates into your brain in an understandable way. Whether specifying a coating for an internal tank lining, or for the exterior of a concrete building, permeability may be on the mind of a specifier. What if the specification is for a steel pipe that sweats, or a coating for an insulated metal panel, will permeability matter?

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