Classification and Types of Adhesives

Adhesives can be classified in many different ways, e.g., by application or setting, chemical composition, cost, materials to be bonded, and end products or use. 

Adhesives can be applied as (a) a melted solid which sets when cooled, (b) a solution or suspension in a solvent which evaporates, and (c) unpolymerized or partly polymerized blend which sets when polymerization is completed. 

The further classification of adhesives can be made by referring to the namre of the material, organic, inorganic, or hybrid. Thus, organic adhesives are either namral (e.g., starch, gelatin, shellac), 

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