The solid buoyancy materials used in deep submersibles are used in seawater and Marine atmosphere, with a temperature of 8 to 50℃. Sea state level, level 4 placement, level 5 recovery; The working area is from ocean plane to 11000m underwater sea area; Service life is required to be 30 years. It not only provides necessary buoyancy for the submersible, forms part of the streamlined shape of the submersible, but also acts as the filling material for the stabilizer wing and the installation support for the equipment inside the submersible. The choice of buoyancy material directly affects the reliability and safety of the submersible.
Its performance requirements are: (1) high pressure resistance, low density; (2) can withstand the wave impact load in the process of deployment and recovery of submersible; ③ Good machinability; (4) Good corrosion resistance; ⑤ Low water absorption under high pressure. In addition, the buoyancy block in the design also requires reasonable layout and block, easy to install, disassemble, in line with the requirements of maintenance. (Excerpt from 《Solid Buoyant Materials》)