Perlite for nonevacuated Cryogenic and low temperature service
Cryogenic Applications for Perlite Insulation
Storage temperatures of (-100 C°) and below are considered cryogenic. Storage temperatures of (-100 C°) and above are considered low temperature. Super cold or extremely cold cryogenic fluids such as hydrogen and helium are normally stored in spherical, double walled vessels with evacuated annular spaces using evacuated Perlite.
Properties of Perlite Insulation
Perlite insulation suitable for nonevacuated cryogenic or low temperature use exhibits low thermal conductivity throughout a range of densities, however, the normal recommended density range is 45 to 75 kg/m³. In addition to its excellent thermal properties, Perlite insulation is relatively low in cost, easy to handle and install, and does not shrink, sell, warp, or slump. Perlite is noncombustible, and meets fire regulations. Because it is an inorganic material, it is rot and vermin proof. As a result of its closed cell structure, the material does not retain moisture.