Glossary

Absorption

Involves the taking of molecules of one substance directly into another substance. It is contrasted with adsorption in which the molecules adhere only to the surface of the second substance. The process may either be physical or a chemical. Physical absorption involves such factors as solubility and vapor-pressure relationships. Chemical absorption involves chemical reactions between the absorbed substance and the absorbing medium.

Acrylic resin

Any of numerous thermoplastic or thermosetting polymers or copolymers of acrylic acid, methacrylic acid, esters of these acids, or acrylonitrile used to produce latex resins and other polymeric forms such as paints, synthetic rubbers, and lightweight plastics.

Additive

Any number of materials used to modify the properties of nonwoven webs, polymer resins and fibers. Categories of additives include reagents, fillers, viscosity modifiers, pigments, flame retardants, anti-microbial agents, water repellents, and wet strength agents.

Adsorption

A separation process by which molecular fluid contaminants are attracted to the surface of the filter medium. There are three forms of adsorption:

Physical Adsorption: A molecular species is attracted to a surface and held in place by weak forces. It is a reversible process.
Chemical Adsorption: A molecular species is attracted to a surface and reacts with that surface or something on that surface to form a chemical bond which holds it in place. Typically considered irreversible at constant conditions.
Catalysis: A molecular species is attracted to the surface which encourages a chemical reaction. The reaction product(s) move away leaving the surface unchanged. Typically, the reaction is...

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