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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
White Sands Test Facility
Document Type
Conference Paper
Beeson, Harold
(NASA White Sands Test Facility NM United States)
Kirsch, Mike
(NASA White Sands Test Facility NM United States)
Hornung, Steven
(Allied-Signal Technical Services Corp. Las Cruces, NM United States)
Biesinger, Paul
(Allied-Signal Technical Services Corp. Las Cruces, NM United States)
Date Acquired
August 17, 2013
Publication Date
March 1, 1997
Publication Information
Publication: Second Aerospace Environmental Technology Conference
Subject Category
Nonmetallic Materials
Distribution Limits
Work of the US Gov. Public Use Permitted.
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