NIST Heat Transmission Properties of Insulating and Building Materials, SRD 81

Apparatus Provides the name of the test apparatus used to provide the test data.
Bulk Density The bulk density (including voids) of the test specimen in kg·m-3 or lb·ft-3.
Comment Provides additional recorded information, if any, about the test.
Conductance (Thermal) The time rate of steady-state heat flow through a unit area of a material or construction induced by a unit temperature difference between the specimen surfaces (in W·m-2·K-1 or Btu·h-1·ft-2·°F-1).
Conductivity (Thermal) The time rate of steady-state heat flow through a homogeneous material induced by a unit temperature gradient normal to the unit area (in W·m-1·K-1) or (Btu·in·h-1·ft-2·°F-1).
Date Date of test (month, day year [xx/xx/xxxx]).
Delta T Difference of hot and cold plate temperatures in K or °F.
Description Provides additional recorded information describing the test specimen.
Final Moisture Content The amount of water (by mass) present in the test specimen at the end of the test in %.
Form Describes the physical characteristics of the material. Can be one of the following: blanket, block, board, loose, pipe, slab, spray, or woven.
ID The database internal identification number.
Initial Moisture Content The amount of water (by mass) present in the test specimen at the start of the test in %.
Interposed Sheets? For purposes of modifying the specimen-plate interface, have sheets of another material been interposed between the test specimens and apparatus plates? [Yes or No]. This field provides information on variation of the test method.
Material Generic name of material of test specimen. Some materials may have additional information that can be seen in the detail page. If it is available, a button saying: "Click for material info" appears.
Material Designation If available, specifies the Trademark® or Trade Name of test specimen. Some trade names may have additional information that can be seen in the detail page. If it is available, a button saying: "Click for designation info" appears.
Material Source Name of manufacturer or third-party source of test specimen.
Mean Temperature Average of hot and cold plate temperatures corresponding to the temperature at the mid-plane of the test specimen in °C or °F.
Mode of Operation Specifies either the traditional two-sided mode of operation for a pair of identical specimens, or one-sided for a single specimen [2 or 1] . This field provides information on variation of the test method.
Other Specimen Specifies the name of the material of the other specimen if the test mode of operation is 1.

Pre-test Conditions Specifies the ambient conditions (temperature, humidity, time), if available, that the specimen was conditioned to prior to testing.
Resistance (Thermal) The quantity determined by the temperature difference, at steady state, between two defined surfaces of a material or construction that induces a unit heat flow rate through a unit area (in m2·K·W-1 or h·ft2·°F·Btu-1).
Resistivity (Thermal) The quantity determined by the temperature difference, at steady state, between two defined parallel surfaces of a homogeneous material of unit thickness, that induces a unit heat flow rate through a unit area (in m·K·W-1 or h·ft2·°F·Btu-1·in-1).
Select Units SI refers to the International System of Units, universally abbreviated SI (from the French Le Système International d’Unités). The term IP (also I-P) is an abbreviation for inch-pound and refers to the system of customary units commonly used in the United States.
Sheet Material Provides the material name if sheets have been inserted between the test specimen and plates.
Specimen Number Assigns a unique identification number to the test specimen.
Specimen Thermocouples Indicates if thermocouples have been installed directly on the faces of the specimens.
Thermal Property Heat transmission property based upon steady-state, one-dimensional heat-transfer tests, including thermal conductance, thermal resistance, (apparent) thermal conductivity, and (apparent) thermal resistivity, among others. The thermal transmission properties of heat insulators and other building materials determined from standard test methods typically include several mechanisms of heat transfer including conduction, radiation, and possibly convection.
Thickness Thickness of cross-section of test specimen in mm or inches.
Uncertainty The relative expanded uncertainty for the estimate for the thermal transmission property of interest in %. Unless explicitly stated, the relative expanded uncertainty for most estimates of the thermal transmission properties ranges from 2 % to 3 % for heat insulators and 10 % for other materials.
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