Nonevacuated Perlite Cryogenic and Low Temperature Insulation Specifications

Perlite for Nonevacuated Cryogenic and Low Temperature Service
Prepared by: The Perlite Institute

NONEVACUATED PERLITE CRYOGENIC AND LOW TEMPERATURE INSULATION SPECIFICATIONS
Density:	3 to 6 lb./ft3
Sieve Analysis (mesh is U.S. Standard) Percent Weight Retained:	Max. 10%=16 mesh (1.18 mm) Min. 50%=100 mesh (0.15 mm)
Thermal Conductivity* Temperature applications: (at mean temperatures of. -40 F or -40 C)	0.24-0.27 Btu.in/h.ft3.F (0.035-0.039 W/m. K)
Nonevacuated Cryogenic Applications: (at mean temperatures -195 F or -126 C)	0.17-0.20 Btu.in/h.ft3.F (0.025-0.029 W/m. K)
*Thermal conductivity varies with temperature, density, pressure, and conductivity of the gas which fills the annulus or insulation space.