"Adhesives are social sub-stances," writes Irving Skiet, author of Handbook of Adhesives. "They unite materials, creating a whole that is greater than the sum of parts." Adhesives bond similar or dissimilar substrates, and growth in the adhesives industry has emanated from its advantages over other joining methods. For an adhesive to bond two substrates, it must: a) wet the substrate, b) chemically bond with the substrate, and c) have good cohesive strength. It is sometimes necessary to incorporate additives to wet the surface and bond with the substrate.
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