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As the demand for subsea-related equipment continues to grow, so does the need for construction materials that suit various subsea requirements. Composite materials, like polyurethane foam, have proven to be cost-effective and advantageous for use in shallow and mid-water applications.

General Plastics supplies hydrostatic, pressure-resistant subsea foam for use in subsea mooring buoyancy, semi-submersible craft, pipeline flotation, underwater robotics, ROV/AUVs, and more. Uncoated, this closed-cell polyurethane foam has been tested to depths of 1,200 ft.

The product is resistant to saltwater and has been used in underwater pumps for offshore drilling rigs. Our LAST-A-FOAM® R-3300 semi-submersible series has been used in support of training operations for the International Space Station.

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  • Underwater Buoyancy
  • Underwater robotics (ROV/AUV)
  • Semi-submersible craft
  • Pipeline flotation
  • Subsea mooring buoyancy
  • Buoyancy for assembly components in weightlessness simulation pools
  • Underwater pumps for offshore drilling rigs
  • Core material for resin-transfer molding


  • Provides buoyancy with depths to 1,200 feet uncoated and 2,400 feet coated
  • Excellent mechanical and insulation properties
  • Easy to machine, coat, and paint
  • Dimensionally stable
  • Resistant to hydrostatic pressure
  • High impact resistance
  • Biologically inert
  • Oil, grease, and solvent resistant
  • Cost-effective solution
  • Does not rot or decay
  • Performs in freshwater and saltwater
  • Compatible with many types of adhesives

subsea foam application

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