Menu
Search
Filters
Close
Menu

Celebrate World Corrosion Awareness Day with 20% off eCourses and eBooks with code WCAD2024 at checkout!

Elastomeric Coatings: A Qualitative Failure Analysis

Elastomeric Coatings: A Qualitative Failure Analysis
Available for download

For decades, waterproofing has been a major concern and a widely researched topic by building scientists and forensic engineers. Elastomeric coatings have been broadly used in different applications since the early 1950s. Manufacturer’s recommendations for the proper application of elastomeric coatings are often based on laboratory conditions (75oF and 50% RH) rather than extreme conditions posed by the real world. This study examines the failure of elastomeric roof coating exposed to conditions of high temperature (150°F) and water pooling caused by precipitation. 

Product Number: 51219-171-SG
Author: N. Alrafie, R.E.Moon, M.Bass
Publication Date: 2018
Industry: Coatings
$0.00
$20.00
$20.00

For decades, waterproofing has been a major concern and a widely researched topic by building scientists and forensic engineers. Elastomeric coatings have been broadly used in different applications since the early 1950s. Manufacturer’s recommendations for the proper application of elastomeric coatings are often based on laboratory conditions (75oF and 50% RH) rather than extreme conditions posed by the real world. This study examines the failure of elastomeric roof coating exposed to conditions of high temperature (150°F) and water pooling caused by precipitation. A qualitative comparison of specimens revealed why roofing contractors must consider environmental conditions as an influential factor in determining the application range of elastomeric coatings. Test specimens were made using different substrates (i.e., glass, asphalt and metals) to test the behavior of elastomeric coating when applied to materials with different thermal expansion and contraction properties. Specimens were prepared using modified methods from ASTM standards C 1375 and D 1640. In the first experiment (after curing), test specimens were exposed to extreme environmental conditions of high heat, constant submersion and 180 repeated cycles of submersion for 2 hours followed by heating in a controlled high temperature chamber (140 – 170°F) for 2 hours each workday. In the second experiment, selected test specimens (flat and granulated asphalt) were exposed to elevated humidity (> 90% RH) during curing, and the remainder specimens were prepared with varying coating thicknesses. All specimens were exposed to conditions described above. Elastomeric-coated specimens submersed continuously expressed bubbling, de-bonding from the substrate, discoloration and shrinkage. During the initial stages of testing, the cyclical specimens did not exhibit bubbling and de-bonding as compared to the submersed specimens. However, both conditions revealed bubbling during the later stages of testing. Specimens that were heated only did not experience bubbling or shrinkage; however, specimens that were cyclically heated and submersed experienced discoloration and de-bonding on the glass substrate. The application of a primer beneath the coating did not offer obvious improvement to test surfaces as compared to non-primed surfaces. Based on adhesion test results (modified ASTM D3359 – 09e2) the substrate that exhibited the strongest bond was granulated roofing and the weakest was metal.

For decades, waterproofing has been a major concern and a widely researched topic by building scientists and forensic engineers. Elastomeric coatings have been broadly used in different applications since the early 1950s. Manufacturer’s recommendations for the proper application of elastomeric coatings are often based on laboratory conditions (75oF and 50% RH) rather than extreme conditions posed by the real world. This study examines the failure of elastomeric roof coating exposed to conditions of high temperature (150°F) and water pooling caused by precipitation. A qualitative comparison of specimens revealed why roofing contractors must consider environmental conditions as an influential factor in determining the application range of elastomeric coatings. Test specimens were made using different substrates (i.e., glass, asphalt and metals) to test the behavior of elastomeric coating when applied to materials with different thermal expansion and contraction properties. Specimens were prepared using modified methods from ASTM standards C 1375 and D 1640. In the first experiment (after curing), test specimens were exposed to extreme environmental conditions of high heat, constant submersion and 180 repeated cycles of submersion for 2 hours followed by heating in a controlled high temperature chamber (140 – 170°F) for 2 hours each workday. In the second experiment, selected test specimens (flat and granulated asphalt) were exposed to elevated humidity (> 90% RH) during curing, and the remainder specimens were prepared with varying coating thicknesses. All specimens were exposed to conditions described above. Elastomeric-coated specimens submersed continuously expressed bubbling, de-bonding from the substrate, discoloration and shrinkage. During the initial stages of testing, the cyclical specimens did not exhibit bubbling and de-bonding as compared to the submersed specimens. However, both conditions revealed bubbling during the later stages of testing. Specimens that were heated only did not experience bubbling or shrinkage; however, specimens that were cyclically heated and submersed experienced discoloration and de-bonding on the glass substrate. The application of a primer beneath the coating did not offer obvious improvement to test surfaces as compared to non-primed surfaces. Based on adhesion test results (modified ASTM D3359 – 09e2) the substrate that exhibited the strongest bond was granulated roofing and the weakest was metal.

Product tags
Also Purchased
Picture of Inspector Protector and the Colossal Corrosion Fighters Comic Book

Inspector Protector and the Colossal Corrosion Fighters

Product Number: 37585
ISBN: Inspector Protector
Author: AMPP EMERG
$2.00

This comic book features Inspector Protector and his super hero team, working to save the world from the corrosion Grubzz. A classroom supplement intended to inform young students about corrosion engineering. Comic Book format - 24 pages.
Thermal Imaging as a Forensic Tool in Coating Failure Investigations
Available for download

Thermal Imaging as a Forensic Tool in Coating Failure Investigations

Product Number: 41208-454-SG
Author: E. Bud Senkowski
Publication Date: 2008
$20.00

This paper discusses the use of thermal imaging as an analytical tool in forensic investigations of moisture-related coating failures applied over hollow core building walls. The success of thermal imaging depends upon detecting subtle temperature differences arising from differences in thermal conductivity of the coated wall surfaces. The method is a valuable adjunct to contemporary failure investigation methodology.
Adhesion Tests and Failure Modes Study on Structural Steel Coatings
Available for download

Adhesion Tests and Failure Modes Study on Structural Steel Coatings

Product Number: 41213-771-SG
Author: Wei Zheng, John J. Myers
Publication Date: 2013
$20.00

Pull-off adhesion behaviors of 15 coating systems in three groups were studied utilizing test method ASTM D4541. Three groups of coating systems included coating systems with organic or inorganic zinc-rich primers, polymeric polyurea coatings, and overcoating systems applied on an existing coating system. 
Categories
Industry
Recently viewed
Popular tags
View all

Association for Materials Protection and Performance

© AMPP All Rights Reserved.
Membership Terms of Content Use
Contact Customer Support