Adhesion is a key factor in the overall efficacy and effectiveness of polyurethane insulation.In spray foam,adhesion is vital for creating and maintaining an airtight seal.The most challenging conditions for adhesion in spray-come from cold and wet environments.The cold temperature slows down reactivity and makes wet out more difficult.Moisture on the surface promotes the urea reaction of isocyanate and water,which produces CO2 and results in surface voids at the interface.It is a common issue for spray foam to fail to meet structural and insulation needs of the client due to cold,wet surfaces.In polyisocyanurate foams,the adhesion of foam to the facer is important both for protection of the polyurethane foam and to maintain high insulation values.It is the need for improved adhesion that has driven this project,which will lead to a better understanding of the problems and potential solutions for different market segments.EP-AT-N11 is being developed as an experimental product targeted for the spray foam market,while EP-IS-1 is developed to meet the needs of the PIR (polyisocyanurate) industry.
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