Term Description
Aliphatic polyurethane

An organic polymer containing straight or branched chain arrangements of carbon atoms. As compared to aromatic polyurethanes, coatings based on aliphatic polyurethane binders typically have better weathering characteristics.
Aliphatic polyurethane coating

A polyurethane coating that contains a specific class of isocyanates based on a long straight chain molecular structure; typically used in finish coats that are exposed to the elements. It is noted for its good weather resistance.
Aromatic polyurethane

An organic polymer usually containing one or more benzene ring structures. As compared to aliphatic polyurethanes, coatings based on aromatic polyurethane binders usually have tougher physical properties.
Polyurethane

A polymer prepared by the reaction of an organic diisocyanate with compounds containing hydroxyl groups (polyols). Polyurethanes, or urethanes as they are sometimes called, may be thermosetting, thermoplastic, rigid or soft and flexible, cellular or solid; they can be aliphatic or aromatic. See "aliphatic polyurethane" and "aromatic polyurethane."
Polyurethane coating

A one- or two-part solvent-based coating that contains polyisocyanate monomer and a hydroxyl containing resin, that reacts during cure to form elastomeric coating.
Polyurethane foam (cellular polyurethane)

Insulation composed principally of the catalyzed reaction product of polyisocyanate and polyhydroxy compounds, processed usually with fluorocarbon gas to form a rigid foam having a predominately closed-cell structure. It is sprayed-in-place or preformed into boards. See "insulation."
Spray polyurethane foam (SPF)

A foamed plastic material, formed by mixing and spraying two components—isocyanate (‚"A-component‚") and resin containing a polyol (‚"B-component‚") to form a rigid, fully adhered, water-resistant, insulating membrane.