HARDNESS: Ability of a coating film, as distinct from its substrate, to resist cutting, indentation, or penetration by a hard object.
HCFC: Hydrochlorofluorocarbon. A physical blowing agent containing at least one carbon, one fluorine, and one chlorine atom in its structure (e.g., HCFC-141b). Effective January 1, 2005, the United States Environmental Protection Administration (EPA) issued a Use Ban Regulation on HCFC-141b blowing agent, meaning that SPF systems containing HCFC-141b could not be domestically produced or imported, under penalty of law, after this date. The regulation also required that any existing inventory of finished product containing HCFC-141b could not be applied after June 30, 2005.
HEAT AGING: Controlled exposure of materials to elevated temperatures for a period of time.
HEAT FLUX: The rate of heat transfer per unit area. Usually used to describe the rate of radiant heat transfer. Units are W/m2 (Btu/ft2•hr).
HEAT SINK: A cold substrate that absorbs the SPF exothermic heat, slowing down the reaction and/or rise of the polyurethane foam or coating.
HERS: See HOME ENERGY RATING SYSTEM.
HFC: Hydrofluorocarbon. A physical blowing agent containing at least one carbon and one fluorine atom in its structure (for example, HFC-245fa). HFCs have no ozone depletion potential.
HIDING POWER: The ability of a coating to hide or obscure a surface to which it has been uniformly applied.
HIGH PRESSURE SPF: See SPF, HIGH PRESSURE.
HOLIDAYS: Application defects whereby small areas are left uncoated.
HOME ENERGY RATING SYSTEM (HERS): HERS is a rating system for residential energy efficiency developed by EnergyStar and RESNET (Residential Energy Services Network). Through a comprehensive design review and analysis, it incorporates HVAC, building enclosure; and orientation, as well as appliance and lighting selection. A HERS score of 0 indicates a net zero-energy home, while a HERS score of 100 represents the energy consumption of home built to the 2003 IECC model energy code. A maximum HERS score of 70 is required for a home to be EnergyStar compliant.
HYBRID INSULATION: A combination of insulation types typically arranged so the SPF insulation acts as an air barrier and/or a vapor retarder, and the other insulation type contributes by adding R-VALUE. (See also R-VALUE.)
HYDROPHILIC: Also known as “water-loving.” Having an affinity or an attraction for water; having the ability of uniting with or dissolving in water.
HYDROPHOBIC: Also known as “water-fearing.” Having no affinity for water; not compatible with water.
HYGROSCOPIC: Attracting, absorbing, and retaining atmospheric moisture.HYGROSCOPICITY: The capacity of a compound or substance to absorb water.
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