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Data | Glossary

Glossary

Asbestos

a group of fibrous minerals which occur as small veins in the massive body of natural hydrous silicates of serpentine or amphobole, and have heat-, fire-, and solvent-resistant prop.

Batt

a pc. of insulation, of the flexible type, cut into easily handleable sizes, square or rectangular in shape, usually 24” or 48” long and with an aluminum foil on one side, and with, or without, a container sheet on the other side.

Binder

the cementing material used to bond fibers, flakes, granular materials together.

Blanket insulation

a flat flexible type of insulation formed into sheets or rolls.  These blankets may be faced or coated on one or both sides.

Cellular Plastic

a plastic whose apparent density is decreased substantially by the presence of numerous cells disposed throughout its mass.

Closed-Cell Foamed Plastic

a cellular plastic in which there is a predominance of non-interconnecting cells.

Conduction the direct flow of heat through a material resulting from physical contact.
Convection the transfer of heat in fluid or air, caused by the movement of the heated air or fluid itself.
Density (apparent) the weight of a unit of volume of a material in its manufactured state, including all voids; usually expressed in pounds per cubic foot (pcf) or kgs. per cubic meter (kg/m3).
Emittance refers to the ability of the surface to emit radiant energy.  Emissivity ranges from 0 to 1 and a lower value indicates a reflective surface with a low level of radiation.
Facing a thin layer, usually factory applied, on the surface of an insulating panel, variously acting as a vapor-barrier, weather-barrier, protector from damage, and a decorative coating.
Fire Retardance that property of a material which delays the spread of fire, either through or over itself.
“R” Value see Thermal Resistance
Radiant Barrier a reflective surface that intercepts the flow of radiant energy.
Radiation the transfer of energy from a higher temp. body, through space, to another body, or bodies, some distance away at a lower temp., without raising the temp. of the medium through which the energy passes.
Reflectance refers to the fraction of incoming radiant energy that is reflected from the surface.
Self-Ignition Temp. the lowest temp. of a material which will cause it to ignite without other ignition source.
Self-Extinguishing that property of a material which enables it to stop its own ignition after external ignition sources are removed.
Thermal Conductance (C-value) the amt. of heat transferred through a unit area of a material in a unit time, through its total thickness, with a unit of temp. diff. bet. the surfaces of the two opposite sides.
Thermal Conductivity
(K-value)
the amt. of heat transferred through a unit area of a material in a unit time, through a unit thickness, with a unit of temp. diff. bet. the surfaces of the two opposite sides.
Thermal Insulation material having air- or gas-filled pockets, void spaces, or heat-reflective surfaces, which, when properly applied, will retard the transfer of heat with reasonable effectiveness under ordinary conditions.
Thermal Resistance
(R-value)
that property of a material which enables it to withstand the passage of heat through it, due to a temp. diff. bet. its two opposite surfaces.
Vapor-Barrier a material which when installed on the high vapor pressure side, retards the passage of the moisture vapor to the lower vapor pressure side.

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