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Hubble Space Telescope Metallized Teflon(registered trademark) FEP Thermal Control Materials: On-Orbit Degradation and Post-Retrieval AnalysisDuring the Hubble Space Telescope (HST) Second Servicing Mission (SM2), degradation of unsupported Teflon(Registered Trademark) FEP (fluorinated ethylene propylene), used as the outer layer of the multilayer insulation (MLI) blankets, was evident as large cracks on the telescope light shield. A sample of the degraded outer layer was retrieved during the mission and returned to Earth for ground testing and evaluation. The results of the Teflon(Registered Trademark) FEP sample evaluation and additional testing of pristine Teflon(Registered Trademark) FEP led the investigative team to theorize that the HST damage was caused by thermal cycling with deep-layer damage from electron and proton radiation which allowed the propagation of cracks along stress concentrations , and that the damage increased with the combined total dose of electrons, protons, UV and x-rays along with thermal cycling. This paper discusses the testing and evaluation of the retrieved Teflon(Registered Trademark) FEP.
Document ID
19990024887
Document Type
Reprint (Version printed in journal)
Authors
Townsend, Jacqueline A. (NASA Goddard Space Flight Center Greenbelt, MD United States)
Hansen, Patricia A. (NASA Goddard Space Flight Center Greenbelt, MD United States)
Dever, J. A. (NASA Lewis Research Center Cleveland, OH United States)
deGroh, K. K. (NASA Lewis Research Center Cleveland, OH United States)
Banks, B. (NASA Lewis Research Center Cleveland, OH United States)
Wang, L. (Unisys Corp. Lanham, MD United States)
He, C. (Unisys Corp. Lanham, MD United States)
Date Acquired
September 6, 2013
Publication Date
January 1, 1988
Subject Category
Nonmetallic Materials
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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