To determine the optimal atmospheric conditions attainable in space capsules, the burning pattern of several fabrics in oxygen enriched environ¬ments (20-100% 02) at 4. 6 psia pressure has been studied. The data demon¬strate that at the pressure used burning is enhanced by oxygen enrichment regardless of the ratio of oxygen to nitrogen. A definite though small advantage exhibited by the synthetic material HT-1 over the other two fabrics implies that it would be profitable to pursue the study by varying the pressure as well as the oxygen concentration.
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