Polyurea is a versatile engineering material that has been commercially available for more than a decade. In recent years, the use of polyurea-based materials to improve failure resistance of materials subjected to explosive loading has become an area of interest. Polyurea is a synthetic, high strength, and high-elongation coating that is usually spray cast onto existing structures to increase their resistance to shock and ballistic/shrapnel loading events, such as, those of an improvised explosive device (IED). The elastomeric material of polyurea is formed by a rapid chemical reaction between a short-chain amine and an isocyanate curative. The rapid forming process of polyurea, which is typically independent of ambient temperature and humidity, differentiates it from polyurethanes. Due to its excellent mechanical properties and higher thermal resistance compared to other engineering elastomers, polyurea has found its niche as a protective coating on military structures and buildings to help mitigate damages resulting from severe threats, such as, blasts, and fragments as an alterntiave for conventional protective coatings.
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