The ability of a coating to resist being worn away and to maintain its original appearance and structure when subjected to rubbing, scraping or wear.

The number of milligrams of potassium hydroxide required to neutralize the free acids of 1 gram of an oil resin, varnish or other substance – generally reported on the nonvolatile content.

A substance added in small quantities to another substance, usually to improve specific properties.

To cause two surfaces to be held together by adhesion.

A body which is held to another body by an adhesive. (See also substrate)

The stage in which two surfaces are held together by interfacial forces which may consist of valence forces or interlocking addition, or both. (See also adhesion, mechanical and adhesion, specific)

A material built into a binder or to form primary bonds to either the substrate or the previously applied coating, with the specific aim of improving dry or wet adhesion, or both.

Adhesion between surfaces in which the adhesive holds the parts together by interlocking action. (See also adhesion, specific)

Adhesion between surfaces which are held together by valence forces of the same type as those which give rise to cohesion. (See also adhesion, mechanical)

A substance capable of holding materials together by surface attachment. Note: adhesive is a general term and includes among others cement, glue, mucilage, and paste. All of these terms are loosely used interchangeably. Various descriptive adjectives are applied to the term adhesive to indicate certain characteristics as follows: (1) physical form, that is, liquid adhesive, tape adhesive, etc.; (2) chemical type, that is, silicate adhesive, resin adhesive, etc.; (3) materials bonded, that is, paper adhesive, metalplastic adhesive, can label adhesive, etc.; (4) condition of use, that is, hot setting adhesive, room temperature setting adhesive, etc.

An adhesive that is apparently dry to the touch and which will adhere to itself instantaneously upon contact; also called contact bond adhesive or dry bond adhesive.

An adhesive that cures spontaneously in the absence of oxygen, the curing being inhibited by the presence of oxygen and catalyzed by metallic ions.

An adhesive that can be used for bonding parts together, such as in the manufacture of a boat, airplane, furniture, and the like. Note: The term assembly adhesive is commonly used in the wood industry to distinguish such adhesives (formerly called “joint glues”) from those used making plywood (sometimes called “veneer glues”). It is applied to adhesives used in fabricating finished structures or goods, or subassemblies thereof, as differentiated from adhesive used in the production of sheet materials for sale as such, for example, plywood or laminates.

An adhesive that sets at room temperatures below 68°F. (See also adhesive, hot setting; adhesive, intermediate temperature setting; and adhesive, room temperature setting)

A two phase system with one phase (the adhesive material) in a liquid suspension.

An adhesive in which the particles or droplets of one of the relative components are enclosed in a protective film (microcapsules) to prevent cure until the film is destroyed by suitable means.

An adhesive in film form, with or without a carrier, usually set by means of heat and/or pressure. The main advantage is uniformity of glueline thickness.

An adhesive, the apparent density of which has been decreased substantially by the presence of numerous gaseous cells dispersed through its mass.

An adhesive subject to low shrinkage in setting, can be employed as a sealant.

A dry adhesive film that is rendered tacky or fluid by application of heat or heat and pressure to the assembly.

A thermoplastic film adhesive which is melted between the adherend surfaces by heat application to one or both of the adjacent adherend surfaces.

An adhesive that is applied in a molten state and forms a bond on cooling to a solid state.

An emulsion of rubber or thermoplastic rubber to water.

A film adhesive usually supported with a different adhesive composition on each side; designed to bond dissimilar materials such as the core to face bond of a sandwich composite.

An adhesive material incorporating a latent hardener or catalyst activated by heat. Usually refers to thermosetting materials, but also describes anaerobic, hot melt adhesive, or those depend on solvent loss for adherence. Thermosetting one component adhesives require heat to cure.

A viscoelastic material which in solvent free form remains permanently tacky. Such materials will adhere instantaneously to most solid surfaces with the application of very slight pressure.

An adhesive that sets in the temperature range from 68° to 86°F.

An adhesive having a volatile organic liquid as a vehicle. Note: This term excludes water based adhesive.

A dry adhesive film that is rendered tacky just prior to use by application of a solvent

An adhesive of proven reliability in engineering structural applications in which the bond can be stressed to a high proportion of its maximum failing load for long periods without failure.

An adhesive supplied in two parts which are mixed before application. Such adhesives usually cure at room temperature.

A set of laboratory conditions designed to produce in a short time the results of normal aging. Usual factors include temperature, light, oxygen, water and other environments as needed.

Noncrystalline; most plastics are amorphous at processing temperature. Many retain this strength under normal temperatures.

An organic coating intended for onsite application to interior or exterior surfaces of residential, commercial, institutional or industrial buildings, in contrast to industrial coatings.

A closed container that provides controlled heat and pressure conditions.

An intermediate stage in the reaction of certain thermosetting resins in which the materials soften when heated and swell when in contact with certain liquids, but may not entirely fuse or dissolve. The resin in an uncured thermosetting adhesive is usually in this stage. Sometimes referred to as Resitol.

The flexible supporting materials for an adhesive. Pressure sensitive adhesives are commonly backed with paper, plastic films, fabric, or metal foil while heat curing thermosetting adhesives are often supported on glass cloth backing.

A component of an adhesive composition that is primarily responsible for the adhesive forces that hold two bodies together. (See also extender and filler)

The penetration or dissolution of adherend surfaces by an adhesive.

The diffusion of coloring matter through a coating from the substrate; also, the discoloration arising from such diffusions. In the case of printing ink, the spreading or running of a pigment color by the action of a solvent such as water or alcohol.

A cone-shaped defect caused by the formation of a gas or liquid under a coating film which results in a localized loss of adhesion and lifting of the coating (film) from the substrate.

A curing agent or hardener rendered unreactive, which can be reactivated as desired by physical or chemical means.

The sticking of a coated surface to an adjacent surface when the two surfaces have been in contact for an extended period of time.

See mottling.

The union of materials by adhesives.

To unite materials by means of an adhesive. (See also adhere)

The unit load applied in tension, compression, flexure, peel, impact, cleavage, or shear, required to break an adhesive assembly with failure occurring in or near the plane of the bond. Note: The term adherence is frequently used in place of bond strength.

See structural bond

The final stage in the reaction of certain thermosetting resins in which the material is relatively insoluble and infusible. Certain thermosetting resins in a fully cured adhesive layer are in this stage. Sometimes referred to as Resite.

A substance that markedly speeds up the cure of an adhesive when added in minor quantity as compared to the amounts of the primary reactants. (See also hardener and inhibitor)