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Nitrogen dioxide vapor penetration of chlorobutyl rubber SCAPE under operational conditionsOperational self contained atmospheric protective ensembles (SCAPE suits) and fabric from the suits were subjected to a series of tests designed to determine the amount of exposure a wearer of the suit would receive if a spill of the hypergolic oxidizer nitrogen tetroxide (N2O4) should occur nearby. The results of these tests show that a wearer of a "stock" SCAPE suit equipped with a standard liquid air pack, if exposed to a spill resulting in a 26 percent increase of oxidizer in the surrounding atmosphere, will experiment no detectable concentration of nitrogen dioxide (NO2) inside the suit for 15 minutes. Thereafter, the NO2 concentration within the suit will increase for 35 minutes at a rate of 0.07 ppm per minute and then at a gradually decreasing rate until an equilibrium concentration of 3.4 ppm is attained after 100 minutes. Momentary increases of as much as 1.6 ppm can be expected if the wearer were to rise quickly from a squatting position, but the additional NO2 would be dissipated within three minutes. The effect of liquid and vapor N2O4 and of liquid monomethylhydrazine on permeation rates and tensile strength of the SCAPE suit fabric was also investigated.
Document ID
19800007858
Acquisition Source
Legacy CDMS
Document Type
Technical Publication (TP)
Authors
Schehl, T. A. (NASA John F. Kennedy Space Center Cocoa Beach, FL, United States)
Beall, T. W. (NASA John F. Kennedy Space Center Cocoa Beach, FL, United States)
Date Acquired
September 4, 2013
Publication Date
February 1, 1980
Subject Category
Inorganic And Physical Chemistry
Report/Patent Number
NASA-TP-1605
Accession Number
80N16118
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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