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Silazane to silicaThin film silica and/or methyl silicone were detected on most external surfaces of the retrieved LDEF. Known sources of silicone in or on the LDEF appear inadequate to explain the ubiquitous presence of the silica and silicone films. Hexamethyldisilazane (HMDS) was used as the Challenger tile waterproofing compound for the Challenger/LDEF deployment mission. HMDS releases NH3 which depolymerizes silicone RTV's. Polyurethanes were also attacked. Much of the silica/silicone contamination of LDEF resulted from HMDS.
Document ID
19920018042
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Harvey, Gale A.
(NASA Langley Research Center Hampton, VA, United States)
Date Acquired
September 6, 2013
Publication Date
June 1, 1992
Publication Information
Publication: Second LDEF Post-Retrieval Symposium Abstracts
Subject Category
Nonmetallic Materials
Accession Number
92N27285
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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