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Development of organic non-flammable spacecraft potting, encapsulating and conformal coating compoundsThe overall program objective was to develop a flexible compound which not only functioned in a manned aerospace environment as an effective electrical insulation, but whose flammability characteristics in 16.5 psia, 60% oxygen/40% nitrogen were evidenced by rapid self-extinguishment and minimal thermal (pyrolysis) degradation. The following polymeric matrices were examined in depth: fluoroelastomers, modified fluoroelastomers, silicone RTV's, and modified silicone and fluorosilicone RTV's. Almost none of these systems burned in air, but all burned in 6.2 psia oxygen. Inorganic, organic, and inorganic/organic additives were evaluated in conjunction with these polymers in order to achieve the required survival in the 16.5 psia 60/40 environment. Depending upon formulations, it was possible to achieve nonflammable products when tested in the 1/4 in. x 1/4 in. x 1 in. configuration, even up to and including 16.5 psia oxygen. However, in order to assure this level of flame resistance, it was found necessary to heavily load the matrix with the additives. This resulted in a significant reduction in mechanical properties and large increases in viscosities. Optimization of formulations to obtain a suitable balance between these properties and flammability resistance led to the final selection of Formulation 387 as the primary system.
Document ID
19720009883
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
Authors
Lieberman, S. L. (Furane Plastics, Inc. Los Angeles, CA, United States)
Date Acquired
September 2, 2013
Publication Date
December 16, 1971
Subject Category
Materials, Nonmetallic
Report/Patent Number
NASA-CR-115364
Accession Number
72N17533
Funding Number(s)
CONTRACT_GRANT: NAS9-8750
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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