Glossary of Terms Used by the SPF Industry

Abstract

Absolute Humidity The actual concentration ofwater vapor in air. May be expressed in units of mass, grams of moisture per kilogram (pound) of dry air, or as a partial pressure in Pa or inches of mercury (in Hg). Accelerator A chemical additive to coating or polyurethane foam systems used in relatively small amounts to increase the speed of the reaction or to decrease the time required to cure or dry. Acrylic Coating A coating system based on an acrylic resin; generally, a latex-based coating system which cures by air drying. Acrylic Resin Polymers of acrylic or methacrylic monomers, often used