Reactive urethane adhesives are available as 100% solids or as solvent based systems and as one or two part adhesives. Unlike most epoxies, polyurethanes can be formulated to be extremely flexible. They form tough bonds with high peel strength and medium to high shear strength. Since they are very flexible, they are often an excellent choice to bond films, foils, and elastomers.
They also have good adhesion properties to sheet molding composites (SMC), and therefore, are used extensively in the automotive industry. Unlike many other structural adhesives, urethane adhesives have excellent low temperature properties. However, urethanes do not have high temperature resistance and often do not bond well to metals unless a primer is applied to the substrate prior bonding.
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