Closed cell, water-resistant polyurethane for surface and sub-surface buoyancy applications
Polyurethane is an ideal material for use in marine buoyancy applications, both as a foam and as a high-performance elastomer. It is commonly used for surface and sub-surface buoyancy projects.
In many applications, large buoys are manufactured from a central core of closed-cell polyurethane foam, which is protected by the use of an outer coating of spray-applied polyurethane elastomer. Typical applications include:
- Mooring buoys
- Anchor pendant buoys
The spray-applied polyurethane outer skin is self-coloured and available from IFS Chemicals in any RAL colour.
These two-part chemical systems are based on optimised polyether or PTMEG polyols, which are reacted with customized MDI prepolymers.
This technology provides polymers with:
- High tensile strength (>18 MPa)
- High elongation (>300%)
- Good Thermal Conductivity (0.19 W/mK)
- Resistant to marine growth
- Excellent long term resilience
- High resistance to abrasion and UV degradation
- Very high resistance to mechanical forces
- Outer skin can be combined with various filament reinforcement materials (such as Nylon)
An alternative manufacturing method uses a rotationally moulded thermoplastic which is then filled with closed cell polyurethane foam giving:
- Excellent long term performance
- Are considerably lighter than steel
- Very competitively priced
Smaller floats can be manufactured using the rotational moulding technique, providing the very best protection from collision and abrasion due to the inherent flexibility and superior mechanical properties of polyurethane elastomers, such as:
The level of buoyancy is governed by the density of the foam and IFS systems cover the density range from 60 to 600 kg/m3. Customized grades are available to cover any level of buoyancy that the project requires – contact us for more details