- Elastomer: A material which at room temperature is capable of being stretched repeatedly at least twice its original length 100% elongation and, upon release of stress, will return to its original dimensions.
- Emulsion: A colloidal dispersion of one liquid in another. (See Latex; Colloidal Dispersion)
- Epoxy: A class of synthetic, thermosetting resins, which produce tough, hard, chemical-resistant coatings and adhesives.
- Expansion Joint: A structural separation between building elements that allows independent movement without damage to the assembly.
- Exotherm: Heat generated by a chemical reaction.
- Fast Set: A coating system with a very fast initial cure time, usually five seconds to one hour.
- Feathered Edge: The thin tapered outside edge of a polyurethane foam pass.
- Filler: A relatively inert ingredient added to coating or polyurethane foam formulations to modify physical characteristics.
- Finish Coat: The coating applied to the base coat to finish the lamina of an EIFS. The finish coat provides color. texture, water protection, dirt resistance and ultra violet ray resistance.
- Fire Resistance: The ability of a building component to resist the spread of fire.
- Flame-Retardant: A substance that is added to a coating or polyurethane foam formulation to reduce or retard its tendency to burn.
- Flash Coat: A thin initial pass of a spray-applied material.
- Foam Stop: The roof edge treatment upon which polyurethane foam is terminated.
- Friability: The tendency of a material or product to crumble or break into small pieces easily.
- Glass Eye or Glass Windows: Thin clear membrane that forms over elongated polyurethane foam cells. Glass eyes may break when coated, forming a pinhole.
- Gloss: The shine, sheen, or luster of a dried film.
- Granule: Size No. 11 ceramic aggregate embedded into wet coating over polyurethane foam for aesthetics, traction, and mechanical resistance.
- Hardness: Measure of how resistant solid matter is to various kinds of permanent shape change when a force is applied.
- HCFC: Hydrochloroflurocarbon. A second generation blowing agent for polyurethane foam.
- Heat Sink: A cold substrate that absorbs the SPF exothermic heat, slowing down the reaction and/or rise of the polyurethane foam or coating.