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A class of solid or semi-solid organic products of natural and synthetic origin, generally of high molecular weights with no definite melting point. Resins are generally water-insoluble and have little or no tendency to crystallize. However, certain resins, such as some polyvinyl alcohols and polyacrylates, are readily dispersible in water. Others, such as polyamides and polyvinylidene chloride, are readily crystallized.

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