REPORT ON THE DEVELOPMENT OF BUOYANCY MATERIALS FOR DEEP SUBMERGENCE.
NAVAL APPLIED SCIENCE LAB BROOKLYN NY
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Laboratory developed syntactic foam formulations MLB-1, MLB-2 and MLB-3 and several commercial materials were subjected to 917 cycles of hydrostatic pressure varying from atmospheric pressure to 10,000 psi. Each cycle consisted of the following 4 minutes - pressure increasing from atmospheric to 10,000 psi 12 minutes - pressure held at 10,000 psi pressure released and held at atmospheric for 4 minutes. The most significant observations to date on the deep-submergence buoyancy materials program are Specimen size as a definite relationship to per cent water absorption. The lower the surface area to volume ratio the less the amount of water absorbed. On the basis of information presently available the most promising materials for deep submergence application are in the following order of merit MLB-3, 3-M scotchply, XP-241, MLB-2, GM 56200-19, MLB-1. Author