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An escalating amount of negative press on the tried-and-true polyurethane finish coats has arisen due to concerns with their free-isocyanate content. This paper explores performance aspects of polyurethanes with respect to their UV resistance properties, and safety issues associated with polyurethanes as a function of their precursor isocyanate molecules.
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The creepage of corrosion underneath a coatings film applied to a steel test panel is often used as a performance test for the anti-corrosion properties of a coating system. Creepage is defined as the degree of corrosion (usually measured in mm) emanating away from a scribe line underneath a coating film applied to a steel substrate. There are several factors which may affect the degree of corrosion creep, one of which is the type and width of scribe cut into the coatings film to the steel substrate. There is a variety of scribing methods used in various test methods and specifications; however it is unclear if there is actually a performance difference observed in corrosion creep when using different scribe types.
Over 30 percent of the 607,000 bridges in the FHWA National Bridge Inventory have steel superstructures. Most of those are protected from corrosion damage by thin film coatings or paints. Those coatings have a finite life in relation to the steel they protect. Over time, they degrade, eventually requiring repair or replacement. When selecting this type of superstructure for a bridge, the operating agency incurs an obligation to maintain the coating on the steel to protect it from corrosion to obtain its full service life.
The SpringHouse Country Market is a local country store, creamery and eatery located on over 400 acres of farmland in Washington, Pennsylvania. Known for their baked goods, the onsite 700-square-foot commercial bakery kitchen featured commercial sheet vinyl flooring. Due to many repairs and deterioration, the floor needed to be replaced. The owners consulted with a respected floor contractor who recommended they replace the vinyl sheet material with a coating material that would be attractive, seamless and durable.
Coating application on the exterior of ocean-going vessels and offshore platforms is normally very time sensitive, and frequently must be performed during times of high humidity, sweating hulls and daily rain showers. This paper will describe the use of solvent free, surface tolerant epoxies that can be applied to wet surfaces during times of very high relative humidity. Both the positive and negative aspects will be covered.
The development of new elastomeric waterborne acrylic resins for use in surfacetolerant maintenance coatings will be described. Applied in thick films of up to 10 to 20 mils, these coatings are resistant to mudcracking, and form an excellent barrier coating for the protection of steel.
The effects of corrosion are wide-spread and widely known. From construction to transportation and everything in between corrosion is a result of environmental effects on the metals we use to build. Corrosion may be controlled, however, through the use of inhibitors as an on-going treatment in order to effectively stall the act of corrosion.
Purpose of this report: • Explain the history of South Coast Air Quality Management District (SCAQMD) Rule 1113 – Architectural Coatings and the process that SCAQMD goes through to lower Volatile Organic Compounds (VOC) in architectural coatings. • Report on progress toward achieving low-VOC products with respect to the coating categories subject to Rule 1113 limits. • Report on progress on Reactivity and Availability assessment of solvents found in architectural coatings. • Report on future activities with regard to architectural and industrial maintenance coatings within the South Coast Air Basin.
PURPOSE OF THIS REPORT: • Explain the history of South Coast Air Quality Management District (SCAQMD) Rule 1113 – Architectural Coatings and the process that SCAQMD goes through to lower Volatile Organic Compounds (VOC) in architectural coatings. • Report on progress toward achieving low-VOC products with respect to the coating categories subject to Rule 1113 limits. • Report on progress on Reactivity and Availability assessment of solvents found in architectural coatings.
Compared to other polymeric materials, silicone offers greater performance in harsh environments. Inherently silicone possesses a large coefficient of thermal expansion (CTE), low modulus, and a low glass transition temperate (Tg). These attributes allow it to maintain elastomeric properties for continuous operation when exposed to extreme heat, cold, and/or UV radiation. Durability is the reason silicone materials are frequently employed as coatings and sealants.
There is a tremendous need for the protection of assets during processing, shipment and storage. Critical spares must be readily available and easy to place into service with minimal impact to the operation of equipment. The proven technology of VCIs (Vapor Corrosion Inhibitors) has long been used to preserve many of these assets using traditional mechanisms such as papers and films.
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.