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Structural adhesives are chemical compounds that join two substrates together to form permanent bonds that have high strength and high modulus properties. Also called load-bearing adhesives, these bonds can withstand a considerable amount of structural stress without losing its structural integrity. Common types of structural adhesives include acrylics, urethanes, and epoxies. Epoxy adhesives are typically mixed with hardeners or curatives to improve their mechanical properties as well as their thermal and chemical resistance. Structural adhesives are widely used in the construction, automotive, and aerospace industries.