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Increasing Weathering Test Acceleration Through higher Irradiance

Increasing Weathering Test Acceleration Through higher Irradiance
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While real time outdoor weathering exposures in benchmark climates, such as South Florida, are highly recommended for determining coating performance and service lifetimes, the lengthy test times required are often problematic. Therefore, outdoor and laboratory artificial accelerated weathering testing has become a mainstay in coatings testing, particularly in the product development phase. 

Product Number: 41214-873-SG
Author: Allen F. Zienik
Publication Date: 2014
Industries: Coatings , Corrosion Monitoring and Control
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$20.00
$20.00

While real time outdoor weathering exposures in benchmark climates, such as South Florida, are highly recommended for determining coating performance and service lifetimes, the lengthy test times required are often problematic. Therefore, outdoor and laboratory artificial accelerated weathering testing has become a mainstay in coatings testing, particularly in the product development phase. For long-lived durable coatings, however, most of these tests still do not produce desirable acceleration factors. Testing at higher irradiance levels than that provided by normal solar radiation affords one option for further test acceleration, typically by a factor of several-fold. However, as stress magnitudes deviate from their natural levels, non-linearity of property response with radiant exposure may occur. Therefore, reciprocity validation is a necessary step when testing at high irradiance. This paper will explain irradiance reciprocity, detail some of the reasons for “reciprocity failure”, describe a simplified test validation method, and illustrate examples of higher irradiance testing and their acceptance in standards.

While real time outdoor weathering exposures in benchmark climates, such as South Florida, are highly recommended for determining coating performance and service lifetimes, the lengthy test times required are often problematic. Therefore, outdoor and laboratory artificial accelerated weathering testing has become a mainstay in coatings testing, particularly in the product development phase. For long-lived durable coatings, however, most of these tests still do not produce desirable acceleration factors. Testing at higher irradiance levels than that provided by normal solar radiation affords one option for further test acceleration, typically by a factor of several-fold. However, as stress magnitudes deviate from their natural levels, non-linearity of property response with radiant exposure may occur. Therefore, reciprocity validation is a necessary step when testing at high irradiance. This paper will explain irradiance reciprocity, detail some of the reasons for “reciprocity failure”, describe a simplified test validation method, and illustrate examples of higher irradiance testing and their acceptance in standards.

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(Testing) Importance and Correlation of Accelerated Weathering Versus 10 years of South Florida Exposure

Product Number: 03-COAT_DEC21
Author: Alaina Rickard / Remi Briand / Laura Burton
Publication Date: 2021
$20.00

The Paint and Coatings industry uses accelerated testing to extrapolate performance in real world situations and ensure coating formulations will withstand the forces of nature and provide long-term durability. This paper will compare the performance data of the three most common accelerated exposure test methods: QUV-A (ASTM D 4587), Xenon Arc (ASTM D 6695), and EMMAQUA (ASTM D 4141) and correlate this data to the same systems exposed for 10 years in South Florida and in North Kansas City, Missouri.
Test Method Development for Improved Laboratory Accelerated Weathering of High Performance Coatings
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Test Method Development for Improved Laboratory Accelerated Weathering of High Performance Coatings

Product Number: 41213-803-SG
Author: Allen Zielnik
Publication Date: 2013
$20.00

The use of accelerated laboratory artificial weathering in coatings development is necessitated by the lengthy times required for natural outdoor weathering. Across a broad range of industries, weathering results from materials exposed in subtropical South Florida have become the benchmark to which accelerated test methods are compared. 
Industrial Protective Coating Tradeoffs: Understanding Why Industrial Coatings can be Complicated
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Industrial Protective Coating Tradeoffs: Understanding Why Industrial Coatings can be Complicated

Product Number: 41214-806-SG
Author: J. Peter Ault
Publication Date: 2014
$20.00

 Industrial protective coatings can be surprisingly complicated for the inexperienced user or specifier. For example, when fabricating complex structures, the simple question of when during fabrication to paint can have an array of interesting cost and performance implications. Other issues include tradeoffs associated with degree of surface preparation and inspection for coating coverage. The paper will explore some of the reasons why they can be complicated in the context of four issues that can impact an industrial protective coatings project.
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