HIGH-PRESSURE VIEWPORTS FOR INFRARED SYSTEMS,
 Phase 1, Germanium, Technical Report 565, Naval Ocean Systems Center, San Diego, CA, by J.D. Stachiw, September 1980, 115 pages.

Spherical sectors fabricated from polycrystalline germanium can serve successfully as pressure-resistant windows in IR systems in the marine environment. Spherical sectors with t/R, = 0.333 and included spherical angle a = 150" withstood 100 pressure cycles from 0 to 20 000 psi without cracking when tested hydrostatically in a compliant metallic mounting with an inclined seat protected by elastomeric gaskets. Nylon cloth-reinforced Neoprene and Kevlar-49-reinforced epoxy gaskets performed successfully provided that the bearing stress did not exceed 20,000 psi for Neoprene and 60,000 psi for epoxy gaskets. The average flexural and compressive short-term strengths of germanium under uniaxial loading were found to be in the 7000-to- 1 5,000-psi and 40,000-to-80,000-psi ranges,

NOSCTR565 CD media: Shipping: Within 72 hours. Cost: $50.00 + S/H