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Numerous industry studies have shown a lack of correlation between outdoor weathering performance in Florida, and performance in common accelerated weathering tests-- particularly when multiple types of resins are being compared. No single accelerated weathering test exists that can predict the outdoor performance for every type of resin in every color.
Numerous industry studies have shown a lack of correlation between outdoor weathering performance in Florida, and performance in common accelerated weathering tests-- particularly when multiple types of resins are being compared. No single accelerated weathering test exists that can predict the outdoor performance for every type of resin in every color. For this reason, when creating new standards and specifications for long lived exterior coatings, it is important to critically examine accelerated weathering data, before setting accelerated weathering requirements that will be used to qualify coating systems. If it is possible to limit a standard to a single well-studied resin chemistry, with accelerated weathering requirements based on the performance in one or more reference colors-- such as is done for SSPC Paint 36-- then risk for coating suppliers and end-users can be reduced dramatically. We will illustrate this principle for waterborne poly(vinylidene fluoride) (PVDF) fluoropolymer topcoats, using new weathering data from commercial and lab formulations. The results are sometimes surprising. For instance, for some darker colors, the coating color fade and chalk resistance in Florida, as a function of PVDF level, is better predicted in fluorescent cabinet testing by using the harsher UVB313 bulbs, rather than the UVA-340 bulbs which closely match the UV part of the Florida solar spectrum.
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.
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Water, steam, and waterjetting have long been used in the conservation of historic artifacts and structures such as the R.M.S. Titanic and the Saturn V Rocket at Johnson Space Center. Integral to the conservation is the removal of loose material, reduction in salts and corrosion, retention of coatings and desirable patina, and repair of damaged areas.
Moisture is a key component of concrete. It is critical to the curing and strengthening process of the product. It is however the use or misuse of this critical component that may cause expensive and unavoidable problems over the life of the floor