Chemical categorization adhesives

Adhesives as materials can be classified in a number of ways, such as chemical structure or functionality. Adhesives are categorized into two classes natural and synthetic. The natural group includes animal glue, casein- and protein-based adhesives, and natural rubber adhesives. The synthetic group has been further divided into two subcategories industrial and special compounds. Industrial compounds include acrylics, epoxies, silicones, etc. An example of the specialty group is pressure-sensitive adhesives. 

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