B

Bead
Sealant or compound after application in a joint irrespective of the method of application, such as caulking bead, glazing bead, etc. Also a molding or stop used to hold glass or panels in position.

Biocide
Material or additive added to greatly delay or stop the growth of bacteria. (see Preservative )

Binder
Component that forms the basic part of the adhesive in multi-component reaction adhesives. Responsible for adhesive properties.

Bleaches
Additive that permits to discolor the exposed area.

Blowing agent
Compounding material used to produce gas by chemical or thermal action, or both, in manufacture of hollow or cellular articles.

Bonding (extended definition)
Joining of identical or different types of material by means of an adhesive, creating a positive-substance bond throughout the entire surface of the joint.

Bonding agent
Syn. Adhesion promoter

Bonding time
Period of time taken for the assembly to achieve sufficient firmness to bear the load exerted on it.

Bond strength
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. Measured in Pounds per Square Inch (PSI). (See Adhesion)
Note: The term adherence is frequently used in place of bond strength.

Butyl rubber, IIR (extended definition)
Butyl rubbers are copolymers of isobutene and small amounts of isoprene. These rubbers are frequently mixed with natural and styrene-butadiene rubbers for obtain special properties like resistance to aging, initial tack at low temperatures, and good peel-off.