Room-Temperature Thermal Conductivity of Fumed-Silica Insulation for a Standard Reference Material

摘要

Thermal conductivity of fumed-silica insulation board was measured using the National Bureau of Standards 1-meter Guarded Hot Plate. Measurements were conducted for the following range of parameters: bulk density, 304.5 to 325.4 kg/cu m; mean temperature, 283.1 to 311.0 K; and barometric pressure, 97.51 to 103.40 kPa. The effect of moisture content on room-temperature measurements was minimized by prior conditioning of the specimen at 100 deg C for 24 hours. Seventy-five samples (600 by 600 by 25.4 mm) were transferred to the Office of Standard Reference Materials in Gaithersburg, Maryland, USA. The material is offered as a Standard Reference Material having a low thermal conductivity at room-temperature.