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••This• repoi.t• ~was .. pfe.par~d•• as: 31) a:ccou•nt _Of. work •.sponsored by the. United States Government. Neither• 1 •:.the• United States-nor the :united States .. Atomic Energy ~• Commission,. 'nor; •any. •of• th.eir einpioyees, nor any-of i their contractors,. s.ubcontractors•, or. their• employees, ., makes any warranty.;:.ex.press or implied, or assumes any ' ' legal' 'liability: or 'resi>o11sibility for the accuracy. com-' " .pleteness oi 'usefuln.ess. of any iilf

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No abstract

Requirements f o r a low-density, high-temperature thermal insulation material led to the development of Palarite, a substance "that consists essentially of. carbon-bonded silica fibers. Palarite i s 'generally prepared with densities i n the .range of 7-10 pounds per cubic foot (pcf), using a vacuum-molding process. The thermal conductiv'i ty of. 8-pcf Palarite increases f r o m 0.25 Btu-.in/hr-o ~-f t 2 a t 70' F to 0.60 Btu-in/hr-" ~-f t Z a t 1,000° F. In an i n e r t atmosphere, o r vacuum, the insulation can be used continuously a t temperatures up to 2,000 " F. However, i n air; oxidation of the carbon binder begins a t temperatures above 500" F.