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Polyurea Thick-Film Elastomeric Coating/Lining Systems Accelerated Weatherometer Testing vs. Real Life Exposure

Polyurea Thick-Film Elastomeric Coating/Lining Systems Accelerated Weatherometer Testing vs. Real Life Exposure
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For years, people have relied upon a variety of industry accelerated testing methods in order to predict how long a coating / lining system may be useful in service. This type of testing would include heat aging, Atlas Cell immersion testing for lining products and accelerated weatherometer testing for coating systems, just to name a few. Polyurea spray applied elastomeric materials have been no exception to this type of testing. One of the most important testing evaluations has been accelerated weatherometer exposure for products used in outdoor application areas. 

Product Number: 41210-565-SG
Author: Dudley J. Primeaux II
Publication Date: 2010
Industry: Coatings
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$20.00
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For years, people have relied upon a variety of industry accelerated testing methods in order to predict how long a coating / lining system may be useful in service. This type of testing would include heat aging, Atlas Cell immersion testing for lining products and accelerated weatherometer testing for coating systems, just to name a few. Polyurea spray applied elastomeric materials have been no exception to this type of testing. One of the most important testing evaluations has been accelerated weatherometer exposure for products used in outdoor application areas. However, much of the data on specific weatherometer testing may in fact be misleading and exaggerated to a point. There have been some observations that exposure to a given number of hours of accelerated exposure, points to a specific number (often high) of years of real-time field performance service without any comparative data. This paper will compare earlier Accelerated Weatherometer Testing (QUV) to real time outdoor exposure on spray applied polyurea elastomeric coating / lining systems.

For years, people have relied upon a variety of industry accelerated testing methods in order to predict how long a coating / lining system may be useful in service. This type of testing would include heat aging, Atlas Cell immersion testing for lining products and accelerated weatherometer testing for coating systems, just to name a few. Polyurea spray applied elastomeric materials have been no exception to this type of testing. One of the most important testing evaluations has been accelerated weatherometer exposure for products used in outdoor application areas. However, much of the data on specific weatherometer testing may in fact be misleading and exaggerated to a point. There have been some observations that exposure to a given number of hours of accelerated exposure, points to a specific number (often high) of years of real-time field performance service without any comparative data. This paper will compare earlier Accelerated Weatherometer Testing (QUV) to real time outdoor exposure on spray applied polyurea elastomeric coating / lining systems.

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New high-solids coatings are sometimes required to meet volatile organic compound (VOC) legislation. Lack of data on same needs accelerated test methods to evaluate performance. The test method must: • Be performed using commercially available equipment • Take a relatively short time period. • Correlate with real life exposure.
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Product Number: 51319-13154-SG
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All protective coatings are thoroughly tested using accelerated laboratory tests. Accelerated testing has the advantage of providing data and results in a relatively short timeframe and the conditions of testing are pre-defined and controlled throughout the test. However accelerated testing also has disadvantages. Accelerated testing at e.g. tougher environmental conditions or higher temperatures may give different degradation mechanisms than at in service conditions.Field exposures can be used as a supplement to accelerated testing and can be utilized as a verification of the test setup.In this paper results from several atmospheric accelerated laboratory exposure tests for numerous protective coating systems have been compared to results obtained from up to nine years of field exposure testing in a marine environment corresponding to corrosion category C5 according to ISO 12944-2.The comparison shows varying correlation between accelerated laboratory tests and field exposures. This indicates that high performance of a coating system during accelerated laboratory testing is not necessarily predictive for high long term performance under in-service conditions. Potentially causing premature coating failures under in service conditions.The authors therefore propose ailormade test scheme for the various generic coatings and the in-service conditions and for the industry to accept a more holistic view on coating performance.
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Product Number: 41208-430-SG
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