Abstract: Disclosed is an elastomer comprising the reaction product of an aromatic isocyanate component, an aliphatic isocyanate component with a functionality of at least two, and having an aromatic diamine component in the curing agent composition. The aromatic isocyanate component is one or more of the following: aromatic isocyanates, aromatic isocyanate terminated aliphatics, aromatic isocyanate terminated cycloaliphatics, aromatic isocyanate terminated quasi-prepolymers, and aromatic isocyanate terminated prepolymers. The aliphatic isocyanate component is one or more of the following: isocyanate terminated aliphatics, cycloaliphatic isocyanate with at least two isocyanates, isocyanate terminated quasi-prepolymers, and isocyanate terminated prepolymers.