Welcome to the Guru Glossary. Select a letter below to view the list of terms starting with that letter:

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Absorption

The capillary of cellular attraction of adherent surfaces to draw off the liquid adhesive film into the substrate

Acrylic Resins

Resins made by the polymerization of acrylic monomers, such as ethyl acryl ate and methyl methacrylates (used in 2nd generation.

Adherent

The substance or surfaces to which the adhesive is applied; the surfaces which are bonded together.

Adhesion Failure

Failure of an adhesive, sealant or coating by pulling away from the surface with which it is in contact. (See cohesive failure)

Adhesive

A substance capable of holding materials together by surface attachment.

Adhesive, Intermediate Temperature Cure

Adhesive capable of curing at temperatures between 87F and 211F.

Adhesive, Pressure Sensitive

An adhesive made so as to adhere to a surface at room temperature by briefly applied pressure alone.

Adhesive, Room Temperature Curing

Adhesive capable of curing at temperature between 68F and 86F.

Adhesive, Separate Application

A two-part adhesive which is used by applying one part to one adherent and one part to the other and bringing them together to form a bond.

Adhesive Solvent

An adhesive having a volatile organic solvent as a fluid carrier.

Adhesive Spread

The amount of adhesive applied to an adherent in terms of grams of liquid or solid adhesive per square meter or pounds per square feet of joint area. Application to one adherent surface is called "single spread". Double glue line refers to an adhesive spread applied to opposite faces of the same sheet of veneer. "Double spread", often referenced in timber laminating, refers to adhesive application- to both adherents.

Adhesive, Structural

A material employed to form high strength bonds in structural assemblies may be used in extreme service conditions, e.g., high and low temperature exposures.

Adhesive, Synthetic Resin

A synthetic resin product, not limited to, but including, amino-plast (urea and melamine formaldehyde resins), resorcinol and phenolic resins.

Adhesive, Two Component

An adhesive supplied in two parts which are mixed before application.

Affinity

The attraction between adhesive and adherent.

Albumin, Blood

See GLUE

Aliphatic

Organic compound whose molecules do not have their carbon atoms arranged in a ring structure.
Alkyd Resins: Resins composed principally of polymeric esters, (polyesters) in which the recurring ester groups are an integral part of the main polymer chain, and
Alligatoring: (Cratering) A term used to describe the defect in an applied coating or mastic when it cracks into large segments. When the action is fine and incomplete it is usually referred to as "checking".
Ambient Temperature: Temperature of the surrounding air. in which ester groups occur in most cross links that may be present between chains.

Amylaceous

Pertaining to or nature of starch.

Animal Glue

See GLUE

Annual Growth Ring

The growth layer put on by a tree during a single year, including summerwood and springwood.

Application Temperature Limits

Temperature between which it is usually safe to apply finishes, adhesives and sealants.

Applicator

A device used to spread an adhesive as a film of the desired thickness.

Aqueous

Water based or containing water.

Aromatic

Organic compound whose molecules have the carbon atoms arranged in a ring structure.

Asphalt

A dark brown to black cementitious material, solid or semisolid in consistency, in which the predominating constituents are bitumens which occur in nature as such or are obtained as residue in refining petroleum. The principal ingredient in asphalt is a mastic.

Asphalt Emulsion

A colloidal (dispersing agent) dispersion of petroleum asphalt in water. The emulsifying agent may be a colloidal clay or a chemical soap.

Assembly

The collection of and placing together in proper order of the layers of veneer, lumber and/or other materials, with the adhesive, ready to be pressed and bonded into a product.

Assembly Time, Closed

The time from closed contact of an assembly having adhesive until application or full pressure.

Assembly Time, Open

Time from spreading adhesive to the first surface until mating surfaces are in contact.

Assembly Time, Total

The total of open and closed assembly times, which is the time from spreading glue to the first surface to the application of full pressure.

A-Stage

An early stage in the curing of thermosetting resin when the material is still fusible and soluble in certain solvents.

Atomize

The reduction of a liquid to a fine spray by means of high pressure air or, as in airless spray, by pressure alone.

Autoclave

A heavy cylindrical vessel equipped for vacuum and/or pressure application. May have attachment for water supply and application of heat.