FLAMMABILITY IN UNUSUAL ATMOSPHERES. PART 1. PRELIMINARY STUDIES OF MATERIALS IN HYPERBARIC ATMOSPHERES CONTAINING OXYGEN, NITROGEN, AND/OR HELIUM
NAVAL RESEARCH LAB WASHINGTON DC
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A study of the flammability of fabrics and other solids under unusual atmospheric conditions was initiated. The most profound effect on both ease of ignition and linear burning rate was caused by oxygen enrichment. For example, many materials which did not ignite in 21 oxygen ignited and burned readily at 31 or 41 oxygen. With a given atmosphere, increase in pressure was often effective in causing ignition where no ignition occurred at lower pressures. Substitution of helium for nitrogen in mixtures with oxygen had two generally significant effects. Helium decreased the tendency of a material to ignite. This effect was shown to be due largely to the high thermal conductivity of helium. Once ignited, burning rates were often much faster in helium than nitrogen.
- Safety Engineering
- Combustion and Ignition