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Reduction of Calcofluor in Solithane Conformal Coatings of Printed Wiring BoardsAn investigation on the outgassing of a pigment employed as a fluorescent medium in conformal coatings has been performed. The conformal coatings in question are used to protect printed wiring boards from environmental hazards such as dust and moisture. The pigment is included in the coating at low concentration to allow visual inspection of the conformal coating for flaw detection. Calcofluor, the fluorescent pigment has been found to be a significant outgasser under vacuum conditions and a potential source of contamination to flight hardware. A minimum acceptable concentration of Calcofluor for flaw detection is desirable. Tests have been carried out using a series of Solithane(TM) conformal coating samples, with progressively lower Calcofluor concentrations, to determine the minimum required concentration of Calcofluor. It was found that the concentration of Calcofluor could be reduced from 0.115% to 0.0135% without significant loss in the ability to detect flaws, while at the same time significant reductions in Calcofluor outgassing and possible contamination of systems could be realized.
Document ID
19970019966
Acquisition Source
Goddard Space Flight Center
Document Type
Conference Paper
Authors
Miller, Michael K.
(NASA Goddard Space Flight Center Greenbelt, MD United States)
Date Acquired
August 17, 2013
Publication Date
January 1, 1997
Publication Information
Publication: Nineteenth Space Simulation Conference Cost Effective Testing for the 21st Century
Subject Category
Nonmetallic Materials
Accession Number
97N21516
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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