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Replacement Technologies for Precision Cleaning of Aerospace Hardware for Propellant ServiceThe NASA White Sands Test Facility (WSTF) is developing cleaning and verification processes to replace currently used chlorofluorocarbon-l13- (CFC-113-) based processes. The processes being evaluated include both aqueous- and solvent-based techniques. Replacement technologies are being investigated for aerospace hardware and for gauges and instrumentation. This paper includes the findings of investigations of aqueous cleaning and verification of aerospace hardware using known contaminants, such as hydraulic fluid and commonly used oils. The results correlate nonvolatile residue with CFC 113. The studies also include enhancements to aqueous sampling for organic and particulate contamination. Although aqueous alternatives have been identified for several processes, a need still exists for nonaqueous solvent cleaning, such as the cleaning and cleanliness verification of gauges used for oxygen service. The cleaning effectiveness of tetrachloroethylene (PCE), trichloroethylene (TCE), ethanol, hydrochlorofluorocarbon 225 (HCFC 225), HCFC 141b, HFE 7100(R), and Vertrel MCA(R) was evaluated using aerospace gauges and precision instruments and then compared to the cleaning effectiveness of CFC 113. Solvents considered for use in oxygen systems were also tested for oxygen compatibility using high-pressure oxygen autogenous ignition and liquid oxygen mechanical impact testing.
Document ID
Acquisition Source
Marshall Space Flight Center
Document Type
Conference Paper
Harold Beeson
(White Sands Test Facility Las Cruces, United States)
Mike Kirsch
(White Sands Test Facility Las Cruces, United States)
Steven Hornung
(White Sands Test Facility Las Cruces, United States)
Paul Biesinger
(White Sands Test Facility Las Cruces, United States)
Date Acquired
August 17, 2013
Publication Date
March 1, 1997
Publication Information
Publication: Second Aerospace Environmental Technology Conference
Publisher: National Aeronautics and Space Administration
Subject Category
Nonmetallic Materials
Meeting Information
Meeting: Aerospace Environmental Technology
Location: Huntsville, AL
Country: US
Start Date: August 5, 2001
End Date: August 7, 2001
Sponsors: Environmental Protection Agency, Alabama State University, American Institute of Aeronautics and Astronautics, National Aeronautics and Space Administration, Marshall Space Flight Center, Air Transport Association of America , National Center for Mfg. Sciences , Society for Advancement of Materials and Process Engineering, Aerospace Industries Association of America, Inc.
Distribution Limits
Work of the US Gov. Public Use Permitted.
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