Subsea Buoyancy Foam: R-3318


Subsea Buoyancy Foam for use on ROVs, AUVs, and other marine robotics applications. This foam can be machined, glued, painted, and coated to build any size or shape of float that you want.

HS Code: 3921.13.0000

Product Description

LAST-A-FOAMĀ® R-3318 is a machinable, hydrostatic pressure-resistant foam that provides buoyancy underwater. The closed-cell structure is engineered to resist penetration by water. Due to its pressure resistance to many fluids and resins, it is also used in resin-transfer molding as a core material. LAST-A-FOAMĀ® R-3318 semi-submersible foam is optimal for shallow to mid-water underwater robotics applications.

This subsea polyurethane foam supports training operations for the International Space Station, providing buoyancy for assembly components in pools that simulate weightlessness.

Note, the 1.9 x 3.4 x 4.9 in block is used on the BlueROV2 to provide buoyancy.


  • Easy to machine, coat, and paint
  • Excellent compressive and insulation properties
  • 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 or saltwater
  • Compatible with many types of adhesive


  • 1 x Subsea Buoyancy Foam: R-3318


Density18 lbs/ft3288 kg/m3
Specific Gravity0.29
Tested Depth (Uncoated)800 ft244 m
Tested Depth (Coated)1600 ft488 m
Sizes available(1) 1.9 x 3.4 x 4.9 in
(2) 24 x 8 x 2.5 in
124 x 86 x 48 mm
610 x 203 x 64 mm
Net Buoyancy (Lifting force)(1) 0.80 lb
(2) 12.34 lb
362 g
5598 g
Weight (in air)(1) 0.32 lb
(2) 5.0 lb
148 g
2268 g

3D Models

FLOAT-1P9X3P4X4P9-R1 (.zip)

FLOAT-24X8X2P5-R1 (.zip)


Material Safety Data Sheet (MSDS) (PDF)

Revision History

26 May 2017

  • Initial Release – R1


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