- Author
-
Woods, F. J.
|
Johnson, J. E.
- Title
- Flammability in Unusual Atmospheres. Part 2. Selected Materials in Oxygen-Nitrogen and Oxygen-Helium Mixtures at Pressures Up to 315 PSIA.
- Coporate
- Naval Research Lab., Washington, DC
- Report
-
NRL 6606; RR 010-01-44-5850,
September 22, 1967,
24 p.
- Distribution
- Available from National Technical Information Service
- Keywords
-
combustion
|
hyperbaric atmospheres
|
oxygen
|
nitrogen
|
helium
|
temperature
|
pressure
|
ignition
|
burning rate
|
flammability
- Identifiers
- atmospheres
- Abstract
- The Naval Research Laboratory has been investigating the flammability of materials under unusual atmospheric conditions. Ignition and flame spread of several fabrics and paper were measured at pressures from 315 psia down to the limiting pressures for ignition. The minimum total prssure limit for the standard filter paper used was much lower at 41 percent oxygen than at 21 percent oxygen in O2/N2 mixtures. Also, the partial pressure of O2 required for ignition at 41 percent was much lower than at 21 percent O2. Although, in general, materials have a faster burning rate in helium mixtures than in nitrogen mixtures, there ar some significant exceptions to this finding. The nature of the material has been shown to have a marked influence on the effect that variables, such as pressure, oxygen content, and diluent, have on the rate of burning.