subsea umbilicals risers & flowlines



  • Reduce the installation costs by minimizing the time spent offshore
  • Push the technical limits of the exploration and production of subsea hydrocarbon fields

Inspired by this certainty, the engineers at BARDOT Group quickly became committed to develop and indicate Technical Polymers capable of conserving high level properties even after very demanding underwater use:

  • Submersion in seawater
  • Hydrostatic working pressure of several hundreds of bars
  • Temperature ranging from 3° to 40° Celsius
  • 25 years minimum of use under these conditions

Accredited with fully documented qualification certificates from the Centre of Experimental Development (Centre de Développement Expérimental) in La Ciotat, some of these materials are now known under the trademarks BarDeep® for compact polymers and Deepfloat® for the syntactic polymers and are offered alongside other field proven Technical Polymers.

For a number of years, the following technical requirements have been added to the aforementioned preliminary organizational imperatives, with regards to:

  • HPHT fields with a need for materials resistant to extremely high temperatures
  • Arctic fields with a need for materials storable in air at extremely low temperatures

Finally, for the past number of years, the “REACH” regulations established by the European Chemicals Agency have formed an additional requirement taken into account by our teams in the development and adaptation of BarDeep® and DeepFloat® formulas.

Thanks to their steady development in polymer expertise over the past number of years, the engineers at BARDOT Group have already designed solutions to deal with these new constraints.


Without getting into an exhaustive description of the science of polymers, liquid or solid, that our engineers can provide you according to your needs, here are some basic concepts on solid polymers, the ideal building material for subsea production systems:

We call a solid polymer an organic material whose molecular mass is greater than 5000 grams per mole.

These materials are the result of complex formulations from high-quality crude oil refining products, or naphtha, and are based on propylene, toluene, benzene, ethylene or even xylene.

BARDOT Group works with the two matrix families of solid polymers:

  • Thermosetting materials (principally urethane, epoxides, rubber, silicone, but also polydicyclopentadiene PCPTD, polytetrafluoroethylene PTFE) are characterized by a three-dimensional cross-linked network whose intermolecular links are intensified by a supply of calories. These are the result of a chemical transformation, called polymerisation or vulcanisation, and offer high mechanical performances.
  • Thermoplastics (principally polyethylene, polypropylene, polyamides, but also polyether ether ketone PEEK, Polyvinylidene fluoride PVDF), are easily fusible and recyclable. These are in turn the result of a chemical-free transformation, by a simple phase change linked to the temperature.

These matrices can be formulated, transformed, and used as such, pure, or combined with filler or reinforcement, which can be fibrous or particulate: carbon fibres, aramid fibres, glass fibres, mica fibres, but also glass flakes, micro and macro elements, hollow or solid, heavy-duty…

Then these matrices, isotropic or not, can be surface modified again by specific thermal or mechanical treatments (such as vacuum nitriding), or at the core by the introduction of flame retardant or antistatic additives for example, whether or not linked to the matrix as well as tracers.


The utilisation properties are defined by the sum of mechanical and physical properties.

For example, the simple reference to a polymer family and a hardness, as “Polyurethane 95 Shore A”, surely does not suffice to completely define a material, not only because there are numerous chemical sub-families of polyurethane (eight basic chemical structures: TDI-Polyether-polyol, TDI-Polyester-polyol, TDI-Polyester-amine, PPDI-polyester-polyol, TDI-Polyether-amine, MDI-Polyether-Polyol, MDI-Polyester/Polyol, PPDO Polyether-Polyol, etc.) which are more or less subject to a continued use in seawater, but also because an identical Shore hardness can show very different mechanical properties. See the real example below:

Polyurethane 95 Unit Shore A "X" Shore A "Y"
Module at 100% MPa 15.0 13.1
Module at 300% MPa 36.0 20.4
Breaking strain MPa 40.0 50.0
Elongation at break % 320 450
Tear Resistance to D-470 kN/m 26.0 31.0

This is why each polymer material is characterized by many other properties, such as:

  • Rigidity or modulus of elasticity
  • Resistance or ultimate constraint properties
  • Hardness or resistance to the penetration of an independent object
  • Resiliency, shock resistance
  • Endurance, fatigue resistance by a rotating pressure
  • Long term wear, under very low pressure but long time periods

Please do not hesitate to ask our teams for any additional information.


Their expertise in structural relationships – utilisation properties of polymer materials, combined with the strong integrated capabilities of macromolecular engineering, now allows BARDOT Groups to identify infinite possibilities and technological opportunities day after day, and to choose from this group of possible materials the most promising according to an extended underwater use, in very specific conditions of exploration and production of marine energy, and also according to the LowPex® philosophy of the group, which aims to provide our clients with a better control of their CAPEX and OPEX.

These materials, connected to their process and recipe of composition, after undergoing and fulfilling the complete challenging qualification procedures, form the established product range of BarDeep® and DeepFloat® materials, basis deemed reliable from designing many mechanical systems, manufactured and commercialised by BARDOT Group, among other “field proven” Technical Polymers. For example, these materials are characterized by their excellent resistant properties to bacterial colonization, even without additives prone to migrate during the period of use.

A portion of BARDOT Group’s resources is also devoted to a prospective analysis on reactive and active materials, which will play an important part in the future technologies of the group, based, among other things, on nano mechanics. 

Bardot Group: SURF Expertises

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