ELASTOMER: A material that at room temperature is capable of being stretched repeatedly to at least twice its original length (100% ELONGATION) and, upon release of stress, will return to its original dimensions. (See also ELONGATION.)
ELASTOMERIC: The elastic, rubber-like properties of a material that will stretch when pulled, and will return relatively quickly to its original shape when released.
ELASTOMERIC COATING: A coating system that when fully cured is capable of being stretched to at least twice its original length (100% ELONGATION), and recovering to its original dimensions. (See also ELONGATION)
ELONGATED CELLS: Excessively large cells in foam or coating, generally caused by off-ratio materials, moisture contamination, or excessive heat.
ELONGATION: The increase in the length of a specimen at the instant that rupture occurs (expressed as a percentage of the original length).
EMBODIED ENERGY: The quantity of energy required to manufacture and supply to the point of use of a product, material, or service.
EMISSIVITY: The ability of a material to radiate or absorb radiant energy. Emissivity is usually expressed as a number (0–1) or a percentage (0%–100%) which is determined at infrared wavelengths. The higher the number, the greater the ability of the material to absorb and radiate infrared radiation.
EMULSION: A COLLOIDAL DISPERSION of one liquid in another. (See LATEX; COLLOIDAL DISPERSION.)
EPOXY: A class of synthetic, thermosetting resins that produce tough, hard, chemical-resistant coatings and adhesives.
ESR: See EVALUATION SERVICE REPORT.
EVALUATION SERVICE REPORT: An evaluation report presenting the findings of ICC-ES (International Code Council Evaluation Service) on the compliance with building code requirements of the subject of the report—a particular building product, component, method, or material.
EXOTHERMIC REACTION: A chemical reaction that produces heat. SPF and certain coatings are the product of exothermic reactions.EXPANSION JOINT: A joint designed to accommodate movement in the structure or components of the system due to thermal or stress-load variation.
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