Knowra Adhesive Adhesive An adhesive is a substance applied between surfaces to bond them together, usually by hardening or remaining tacky. Its performance depends on adhesion to each surface and cohesion within the bond.
Adhesion : The attraction or bonding between unlike materials at their interface. It describes how an adhesive attaches to each surface it joins.
Surface energy : The excess energy at a material's surface relative to its interior. It helps determine whether an adhesive can spread and make close contact.
Pressure-sensitive adhesive : An adhesive that forms a bond under light pressure without requiring heat, solvent evaporation, or chemical curing. It enables tapes and labels to bond quickly while remaining tacky.
Mechanical fastening : Joining components with devices such as screws, bolts, rivets, or pins. Fasteners transfer loads through discrete contact points rather than a continuous bonded area.
Cohesion : The attraction between like molecules that holds a material together. It explains whether the adhesive layer stays intact under stress.
Surface preparation : Treatments that clean or modify a surface before coating, bonding, or finishing. Cleaning, abrasion, or chemical treatment can improve adhesive contact and durability.
Epoxy : A class of reactive resins that form cross-linked polymers when cured with suitable hardeners. Epoxy adhesives create strong, durable bonds for structural and repair applications.
Welding : A process that joins materials by fusion, pressure, or both, often with added filler material. Welding can create a direct material joint without a separate adhesive layer.
Wetting : The spreading of a liquid across a solid surface, governed by interfacial energies. An adhesive must usually spread across a surface to establish intimate contact.
Polymer : A large molecule made of repeating chemical units linked into chains or networks. Many modern adhesives are polymers or form polymer networks as they cure.
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