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Appl Environ Microbiol. 1965 January; 13(1): 10-14
Copyright © 1965 American Society for Microbiology. All Rights Reserved.

Viability of Bacillus subtilis Spores in Rocket Propellants

Research Laboratories, Lockheed Missiles & Space Company, Palo Alto, California

ABSTRACT

The sporicidal activity of components used in liquid and solid rocket propellants was tested by use of spores of Bacillus subtilis dried on powdered glass. Liquid propellant ingredients tested were N₂O₄, monomethylhydrazine and 1,1-dimethylhydrazine. N₂O₄ was immediately sporicidal; the hydrazines were effective within several days. Solid propellants consisted of ammonium perchlorate in combination with epoxy resin (EPON 828), tris-1-(2-methyl) aziridinyl phosphine oxide, bis-1-(2-methyl) aziridinyl phenylphosphine oxide, and three modified polybutadiene polymers. There was no indication of appreciable sporicidal activity of these components.