DEVELOPMENT OF AN AUTOMATED ARTIFICIAL AGEING TEST APPARATUS FOR SEALANTS SYNCHRONIZED WITH OUTDOOR EXPOSURE TESTING

2007 ◽  
Vol 72 (615) ◽  
pp. 39-46
Author(s):  
Hiroyuki MIYAUCHI ◽  
Yoshiaki TAKEMOTO ◽  
Kyoji TANAKA
Keyword(s):  
Outdoor Exposure ◽  
Artificial Ageing ◽  
Test Apparatus ◽  
Ageing Test ◽  
Exposure Testing

Exposure of Polymeric Glazing Materials Using NREL’s Ultra-Accelerated Weathering System (UAWs)

2010 ◽  
Author(s):  
Carl Bingham ◽  
Gary Jorgensen ◽  
Amy Wylie
Keyword(s):  
Light Intensity ◽  
Thermal Effects ◽  
Outdoor Exposure ◽  
Exposure Chamber ◽  
Accelerated Weathering ◽  
Intensity Level ◽  
Design And Implementation ◽  
Different Temperatures ◽  
Exposure Testing ◽  
Ultraviolet Irradiance

NREL’s Ultra-Accelerated Weathering System (UAWS) selectively reflects and concentrates natural sunlight ultraviolet irradiance below 475 nm onto exposed samples to provide accelerated weathering of materials while keeping samples within realistic temperature limits. This paper will explain the design and implementation of the UAWS which allow it to simulate the effect of years of weathering in weeks of exposure. Exposure chamber design and instrumentation will be discussed for both a prototype UAWS used to test glazing samples as well as a commercial version of UAWS. Candidate polymeric glazing materials have been subjected to accelerated exposure testing at a light intensity level of up to 50 UV suns for an equivalent outdoor exposure in Miami, FL exceeding 15 years. Samples include an impact modified acrylic, fiberglass, and polycarbonate having several thin UV-screening coatings. Concurrent exposure is carried out for identical sample sets at two different temperatures to allow thermal effects to be quantified along with resistance to UV.

scholarly journals Artificial Ageing of Photocatalytic Nanocomposites for the Protection of Natural Stones

Coatings ◽  
2020 ◽  
Vol 10 (8) ◽  
pp. 729 ◽  
Author(s):  
Marco Roveri ◽  
Sara Goidanich ◽  
Lucia Toniolo
Keyword(s):  
Outdoor Exposure ◽  
Research Field ◽  
Chemical Degradation ◽  
Titania Nanoparticles ◽  
Solar Irradiation ◽  
Accelerated Ageing ◽  
Accurate Information ◽  
Artificial Ageing ◽  
Stone Conservation ◽  
Natural Stones

During the last ten years, photocatalytic nanocomposites combining titania nanoparticles with silicon-based matrices have received increasing attention in the stone conservation research field, because they offer an effective multifunctional approach to the issue of stone protection. However, much work still has to be done in studying the behaviour of these nanocomposites in real environmental conditions and understanding to what extent they are able to retain their effectiveness and compatibility once applied on outdoor surfaces. The latter is a key information that should lie at the basis of any successful conservation and maintenance campaign. The present study provides insight into this relevant topic trough laboratory testing by assessing the artificial ageing of two silane-based photocatalytic nanocomposites, previously selected through an accurate testing on different natural stones. Three accelerated ageing procedures, based on artificial solar irradiation, heating and rain wash-out, allowed simulating about two years of outdoor exposure to some of the weathering factors to which stones are normally subjected. The results provided quite accurate information about the long-term behaviour of the products and on the role that the stone properties play therein. It was shown that, when the products are able to penetrate deeply enough inside the stone pores, they retain much of their hydrophobising and photocatalytic properties and maintain a good compatibility with the stone substrates, even after partial chemical degradation of the alkyl-silica matrices has occurred on the very stone surface.

scholarly journals Outdoor-exposure testing of painted coating and the weathering factors involved.

1986 ◽  
Vol 37 (12) ◽  
pp. 718-723
Author(s):  
Shoji YAJIMA ◽  
Yasuhito TOGAWA ◽  
Shizuo MATSUSHITA ◽  
Takakazu SUZUKI ◽  
Tatsuhiro OKADA
Keyword(s):  
Outdoor Exposure ◽  
Exposure Testing

scholarly journals Degradation of rubber to metals bonds during its cathodic delamination, validation of an artificial ageing test

2011 ◽  
Vol 72 (3) ◽  
pp. 279-286 ◽  
Author(s):  
Maryline Nakache ◽  
Emmanuel Aragon ◽  
Lénaïk Belec ◽  
François-Xavier Perrin ◽  
Gérard Roux ◽  
...  
Keyword(s):  
Artificial Ageing ◽  
Ageing Test ◽  
Cathodic Delamination
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