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Adhesive is a broad term as it incorporates various materials like cement, glue, mucilage, and paste among others. Adhesives majorly comprise of polymers, which harden either in a physical manner or as a result of a chemical reaction, and are generally classified on the basis of their curing, or bonding, mechanism. On the other hand, sealant is a soft, pliable material that changes state to become solid after application, and is chiefly employed for the prevention of air, noise, dust, fire, smoke, and liquid penetration, where structural strength is not required. Sealants fall between the higher-strength adhesives and extremely low-strength putties and caulks. Adhesives and sealants are categorized on the basis of whether the bonding involves a physical or chemical mechanism.
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