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Next-Generation Polyaspartate Topcoat: Matching Throughput with Performance
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By James McCarthy, PPG Protective & Marine Coatings

Presented at SSPC 2012; Session: Extending the Life of a Bridge; Session chair: Winn Darden

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The benefits of heavy-duty topcoats based on polyaspartic ester resin technology are well documented. Among other benefits, the fast reaction kinetics of these topcoats, as compared to traditional polyurethane topcoats, results in faster cure-to-handle times and increased throughput at the fabrication shop, an important consideration when evaluating project costs. Additionally, polyaspartic topcoats have inherently higher corrosion resistance as compared to traditional polyurethane topcoats, thus allowing for robust two-coat systems when applied over zinc-rich primers. However, first-generation polayapartate finishes have certain limitations, such as diminished recoatability and shortened pot life when applied under conditions of high humidity. Next-generation polyaspartate topcoats have been developed which overcome these limitations as well as offering improved weathering and corrosion resistance. This presentation will discuss the features and benefits of these next-generation topcoats, and will compare certain properties of these versus first-generation products as well as traditional polyurethanes.

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