Glossary
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TermDefinition
- AbatementThe reduction or elimination of a substance or intrusion such as lead, asbestos, or noise.
- Abrasion ResistanceThe ability of a material to withstand abrasion without showing signs of erosion.
- Absolute ZeroThe point at which all molecular motion ceases and the absence of heat results. This point is measured at -459.6 Fahrenheit and -273.2 Celsius.
- AbsorbanceA measure of a material’s total capacity to take up and assimilate liquids (liquid or vapour form).
- AbsorbencyA measure of a material’s capacity to take up and assimilate liquids (from liquid or vapour form).
- AbsorptionTransformation of radiant energy to alternate through interaction with matter.
- Acoustical TreatmentThe application of absorbent insulation to control sound.
- Acrylic ResinResin produced by the polymerization of acrylic monomers like ethyl acrylate and methyl methacrylate.
- AdhesiveA bonding agent used to combine materials.
- Aggregate SizeThe size of particles in a cement, concrete, loose fill insulation, or similar materials. The size is presented as a percentage of those particles which will or will not pass-through the mesh of a given screen area.
- AlligatoringThe cracking of a coating or mastic into large segments. Incomplete cracking is usually referred to as checking.
- AmbientThe concept of surrounding or encompassing as it applies to temperature, humidity, and atmospheric conditions.
- Ambient TemperatureThe average temperature of air or any other medium surrounding an object.
- AmityFriendship or peaceful relations, as between neighbours or nations.
- Anti-Abrasive CoatingA material which prevents erosion by placing a “cushion” between pipes, ducts, vessels, and adjoining insulation.
- Anti-SweatAn application which prevents condensation.
- Apparent Thermal ConductivityThe thermal conductivity of any material exhibiting thermal transmission through heat transfer. This results in variations in the thickness and surface emittance of the material. See also “Conductivity, Thermal.”
- Apparent Thermal ResistivityThe resistance of any material exhibiting thermal transmission via heat transfer. This results in variations in the thickness or surface emittance of the material. See also “Resistivity,” “Thermal,” and “R-Value.”
- Appearance CoveringMaterials used to improve the aesthetics of finished insulation.
- Application Temperature LimitsThe minimum and maximum temperature range in which it is usually safe to service finishes, adhesives, and sealants without placing the integrity of the material at risk.
- Area WeightThe weight per unit area of a given sample, expressed in units of lbs/ft² (kg/m²).
- Asbestos AbatementThe removal, enclosure, or encapsulation of asbestos-containing materials from a given area.
- Asphalt Cut-BackA petroleum asphalt coating containing mineral solvents, also referred to as a vapour-retarder mastic.
- Asphalt EmulsionThe colloidal dispersion of a petroleum asphalt coating with water, also referred to as a breather mastic.
- ASTM InternationalASTM International provides a global forum for the development and publication of international voluntary consensus standards for materials, products, systems, and services.
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