Adhesives

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Uses	Bonding materials
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Adhesives are substances used for bonding objects or materials together. They are commonly referred to as glue, cement, mucilage, or paste. Adhesives can be found in various forms, including liquid, paste, and solid.

Types of Adhesives

Adhesives can be classified based on their origin, composition, and application. The main types include:

• Natural adhesives: Derived from natural sources such as plants and animals. Examples include starch, dextrin, and casein.
• Synthetic adhesives: Man-made adhesives created through chemical processes. Examples include epoxy, polyurethane, and cyanoacrylate.
• Pressure-sensitive adhesives: Adhesives that form a bond when pressure is applied. Commonly used in tapes and labels.
• Hot melt adhesives: Solid adhesives that melt upon heating and solidify upon cooling. Used in packaging and bookbinding.
• Reactive adhesives: Adhesives that cure through a chemical reaction. Examples include epoxy and anaerobic adhesives.

Applications

Adhesives are used in a wide range of applications, including:

• Construction: Used for bonding materials such as wood, metal, and concrete.
• Automotive industry: Used in the assembly of vehicles and for repair purposes.
• Medical field: Used in surgical procedures and for wound care.
• Packaging: Used for sealing boxes and cartons.
• Electronics: Used for bonding components in electronic devices.

Properties

The effectiveness of an adhesive depends on several properties, including:

• Adhesion: The ability to stick to a surface.
• Cohesion: The internal strength of the adhesive.
• Viscosity: The thickness of the adhesive.
• Curing time: The time it takes for the adhesive to set.
• Temperature resistance: The ability to withstand temperature changes.

History

The use of adhesives dates back to ancient times. Early humans used natural adhesives such as tree sap and animal glue for various purposes. The development of synthetic adhesives began in the early 20th century, leading to a wide range of modern adhesives with specialized properties.

See also

• Sealant
• Cohesive
• Epoxy
• Polyurethane
• Cyanoacrylate