Moisture Absorption of Coated Composite Materials

Report No. ARL-MR-508
Authors: Melissa A. Klusewitz, Christopher P. R. Hoppel, Steven H. McKnight, and James F.Newill
Date/Pages: March 2001; 38 pages
Abstract: Moisture diffusion measurements were made for coated and uncoated composite materials. Two substrates were used: T650/1914-4 (a graphite fiber reinforced thermoset epoxy) and AS4/UItem (a graphite fiber reinforced thermoplastic polymer). The specimens were tested uncoated and coated with three polymer coatings MIL-P-53030 Primer, Humiseal 2A53, and 2031 Siloxirane. The coatings generally absorbed more moisture than the specimens and increased the total moisture absorption for the coated parts. For the AS4/Ultem bars, anisotropic diffusion constants were measured, and diffusion occurs in the fiber direction three times faster than transverse to the fibers.
Distribution: Approved for public release
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Last Update / Reviewed: March 1, 2001