Leading-edge Buoyancy Foam Solutions
High-performance subsea buoyancy modules for underwater vehicles
All buoyancy modules and equipment manufactured by ALSEAMAR are sold under the BMTI brand name. ALSEAMAR has the largest and dedicated manufacturing plant capacity for subsea foam modules for underwater vehicles and has internalized each production step.


The lowest densities and reliable syntactic foam
By combining material technology and design experience, BMTI designs, formulates and manufactures high performance foams for a maximised vehicle uplift with long term duration.
BMTI foams offer a wide range of densities and mechanical properties. Our design & engineering team will advise on the best foam reference that will provide the best combination to each subsea vehicle, depending on its size, shape and maximum depth. We can provide both standard foam blocks or custom-shaped buoyancy modules.
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TEST-PROVEN FOAMS BLOCKS
A wide range of buoyancy solutions
BMTI Standard Blocks
Wide range of buoyancy references
from shallow waters to very deep waters.
Custom Projects
In-house manufacturing
to ensure consistent product delivery
The power of expert teams
ALSEAMAR’s human-scale approach enables highly responsive and personalized support from the teams.
The company provides genuine, expert advice to optimize the balance between superior technical performance and long-term durability, ensuring that each solution is tailored to meet the specific needs of their clients.
The teams of experts easily create foam blocks that are specifically designed for seamless integration into vehicles and various applications, making the process smooth and efficient.
A wide range of naval defense vehicles
ALSEAMAR offers modular installation and permanent subsea buoyancy for flowlines as well as insulation boxes for the sea industry.
BMTI is well known to provide solutions for the oceanography market as its equipment is deployed at great depths over long periods time, requiring also materials engineered and products designed to meet this challenging requirement.
ROV (Remote Operated Vehicle) buoyancy
AUV (Autonomous Underwater Vehicle) buoyancy
Hybrid ROV buoyancy
Deep ocean exploration submersible buoyancy
Human-occupied submersible buoyancy
High quality at every step of manufacturing
Incorporating BMTI materials into underwater vehicles manufacturing significantly reduces the density and weight of the buoyancy, whilst providing the highest strenght to weight ratio to meet the deep and ultra-deep-water environment demands of both strenght and weight.
Quality and traceability throughout the process, with identification of each block, test sample on each block, etc.
Reasonable production and delivery times
Control of the entire process: R&D & manufacturing, with in-house formulation and manufacturing from A to Z
DNV is the reference third-party organization that qualifies all suppliers capable of manufacturing equipment for this type of deepwater machine.
This will enable ALSEAMAR to open up the demanding market for buoyancy systems for manned submarines, which requires syntactic foams of the highest technical level, and for which every manufacturer must be qualified by DNV.

Specialized and dedicated factory
A factory 100% dedicated to syntactic foam, offering an optimal ratio of technical capacity to lead time. This is achieved through strategic investments in both state-of-the-art machinery and skilled personnel, ensuring controlled and reasonable lead times.
ALSEAMAR stands out for its agility and responsiveness, offering the flexibility of a smaller structure while delivering the expertise and solutions of much larger companies. The company’s approach is centered on true collaboration, working closely with their clients to meet their specific needs and adapt quickly to any challenge.
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