Durability and Weathering

Web Exclusive: Powder Coatings Protect the New York City Skyline

Hudson Yards in New York City
Powder coatings on the market today are far more versatile than the first products developed decades ago. In addition to a traditional smooth appearance, today’s powder coating technology enables the formulation of coatings that provide sparkle, color travel, special effects, and textured surfaces while providing increased protection against corrosion and weathering. Access to the ever-widening array of powder coating technologies...

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Coating Mechanics to Defend Against the Environmental Elements

Upper storey detail of timber clad apartment building painted bright with penthouse balcony under blue sky
Exterior surfaces experience degradative environmental conditions, such as intense UV exposure, rain, and temperature swings, leading to deterioration. Coatings are low-cost solutions offering decades of protection and preventing significant repair costs for buildings. The coating must withstand UV, mitigate water damage, and express the flexibility required to maintain adhesion to dimensionally unstable substrates (i.e., wood) as they undergo thermal expansion...

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Morphological Changes in Exterior Surface Coatings After Exposure to Cyclic Water Submersion and Ultraviolet Exposure

View of Centrovia industrial zone, La Muela, Saragossa province, Aragon, Spain
Exterior surface coatings used in many applications can be exposed for long periods of time to cyclic exposure consisting of water submersion or local water surface puddling followed by water evaporation and solar exposure. Under such conditions, several macroscopic defects can appear including blistering, adhesion loss, soil pick-up, cracking, erosion, etc. However, quite often surface microscopic film defects can start...

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Sustainability, Durability, and Ease of Use Drive Exterior Wood Coating Developments

Man installing wood flooring in home
Despite growing interest around the world in the use of concrete and composite materials, wood remains widely used in exterior architectural applications, including siding, decking, fencing, and similar applications. Coatings continue to play an important role in maintaining the appearance and protecting the integrity of wood. “Exterior wood has conveyed quality and beauty for centuries, but that beauty requires significant...

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Weathering and Field Defects

mpty blue wooden background, texture with copy space
The coating system almost always is blamed for field defects, but there are other possibilities: design of the painted object, poor substrate quality or surface preparation, and the process, including application and cure. Was the painting done in the sun? Or in the rain? Were the freshly painted rail cars pushed out into fog? Were all the required coats applied?...

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1K PUR Dispersion with Comparable Performance to 2K Waterborne Coating

New Residential House; Architectural Asphalt Shingle Roof, Vinyl Siding, Gables
Experimental To increase the performance of a 1KWB PU to the level of a 2KWB PU, an intensive development program was undertaken. Its goal was to develop a 1KWB PU with higher film hardness (e.g., >2H pencil gouge hardness) and with superior chemical resistance (e.g., detergent, nitric acid, and mortar). The study examined various kinds of high molecular weight polyol,...

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Early Rain Resistance and Surfactant Leaching Resistant Binder

View from the window of a private house in rainy weather
The development of an effective waterborne technology for exterior paints has become a significant challenge in the architectural coatings market due to the growing expectations of end users (total cost of ownership), diversification of materials used for exterior walls and siding, and the continuous trend towards VOC reduction. This article describes a new product based on our company’s Low Exudation...

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