ALSEAMARSyntactic Foam Blocks

Syntactic Foam Blocks

A Wide Range of Densities for Each Depth and Requirement Down to Very Deepwater

All references can be used for offshore, naval defense and ocean applications. These below meet the needs of these sectors.

Standards Blocks

For each depth or application, BMTI offers several ranges of references, advised by our team of experts to help you make the right choice (technically and price-wise).

BMTI delivers a full range of advanced epoxy-based syntactic foams engineered for critical subsea operations—from subsea vehicles to permanent deepwater structures.
Designed for use at depths up to 12,000 meters, BMTI’s materials combine low density, high mechanical strength, and long-term reliability under extreme pressure and environmental conditions.

High-Performance Foams for Demanding Environments

ALSEAMAR offers a complete range of advanced technical foams, each designed to meet the specific challenges of subsea applications — from surface to ultra-deep depths.

Macrosphere Foam

This foam combines large fiber spheres embedded with epoxy resin, providing an excellent balance between low density and mechanical strength. Ideal for buoyancy applications and large volume buoyancy parts.

N

Lightweight

N

Reliable to shallow up to mid-depths

N

Typical usage depth : up to 1500 msw

Expanded Foam (Including PVC Foam)

This is a closed-cell material that offers excellent densities for shallow subsea use.

N

Lightweight

N

Surface & shallow water depth compliant

N

Typical usage depth : up to 700 msw

Pure Syntactic Foam

Syntactic foam is composed of hollow glass microspheres embedded in a solid resin matrix. It offers extreme pressure resistance combined with the lightweight densities in the harshest environments.

N

Engineered for depths

N

Built to withstand pressure

N

Typical usage depth : up to 12 000 msw

High Performance Grade

density tolerance from ±5 to ±15 kg/m³

Reference	Max. Depth Rating	Density of block	Hydrostatic Crush	Safety Factor	density_lb	post_name
HP1000	1,000	380	260	2.57	23.7	hp1000
HP2000	2,000	395	380	1.88	24.7	hp2000
HP3000-26	3,000	418	500	1.65	26.1	hp3000-26
HP4000-27.5	4,000	440	570	1.41	27.5	hp4000-27-5
HP5000-30	5,000	485	760	1.50	30.3	hp5000-30
HP6000-33.8	6,000	542	880	1.44	33.8	hp6000-33-8

Very Low Density Grade

density tolerance from ±10 to ±15 kg/m³

Reference	Max. Depth Rating	Density of block	Hydrostatic Crush	Safety Factor	density_lb	post_name
VLD1000	1,000	390	220	2.17	24.3	vld1000
VLD2000	2,000	400	280	1.39	25.0	vld2000
VLD3000	3,000	425	450	1.48	26.5	vld3000
VLD4000	4,000	448	540	1.33	28.0	vld4000
VLD5000	5,000	480	706	1.39	30.0	vld5000
VLD6000-33.4	6,000	535	840	1.38	33.4	vld6000-33-4
VLD7000-34	7,000	545	920	1.29	34.0	vld7000-34
VLD8000	8,000	593	1,050	1.28	37.0	vld8000

Low Density Grade

density tolerance ±15 kg/m³

Reference	Max. Depth Rating	Density of block	Hydrostatic Crush	Safety Factor	density_lb	post_name
LD2000	2,000	420	300	1.48	26.2	ld2000
LD3000	3,000	435	450	1.48	27.2	ld3000
LD4000	4,000	460	540	1.33	28.7	ld4000
LD5000	5,000	505	706	1.39	31.5	ld5000
LD6000	6,000	565	840	1.37	35.3	ld6000
LD7000	7,000	575	930	1.30	35.9	ld7000
LD10000	10,000	715	1,450	1.41	44.6	ld10000
LD12000	12,000	740	1,856	1.50	46.2	ld12000

Standard Grade

density tolerance ±30 kg/m³

Reference	Max. Depth Rating	Density of block	Hydrostatic Crush	Safety Factor	post_name	density_lb	row_id
SF1100	1,100	445	280	2.52	sf1100	27.8	8,121
SF3000	3,000	495	480	1.58	sf3000	30.9	8,123
SF4500	4,500	545	630	1.38	sf4500	34.0	8,125
SF6000	6,000	585	890	1.46	sf6000	36.5	8,128
SF8000	8,000	710	1,120	1.37	sf8000	44.3	8,130

Selection Tool

Min:

Density

Max:

380 kg/m³

740 kg/m³

Min:

Depth

Max:

1,000 msw

12,000 msw

Min:

Safety Factor

Max:

1.28

2.52

Buoyancy Calculator

How much volume and how many blocks do you need?

Insulation Foam Blocks

BMTI advanced insulation materials are designed to operate reliably at depths up to 4,000 meters and withstand service temperatures up to 140°C, making them ideal for deepwater flow assurance and subsea thermal insulation applications:

High glass transition temperature (Tg 110°C to 140°C) for structural integrity under heat
Excellent thermal stability under high hydrostatic pressure
High compressive strength
Superior hot-wet resistance, preventing water ingress and thermal degradation
Optimized for use with composite layers

High Thermal Grade

density tolerance from ±20 kg/m³

Reference	Max. Depth Rating	Density of block	Glass Transition Temperature	Compressive Strength	temperature_use	density_lb	post_name
HTG180/35	2,000	560	180	55	110	35.0	htg180-35
HTG180/38	2,000	615	180	54	110	38.4	htg180-38
HTG180/40	3,000	655	180	83	110	40.9	htg180-40
HTG180/43	4,000	690	180	96	110	43.1	htg180-43
HTG215/47	4,000	750	205	130	140	46.8	htg215-47

Fire Resistant Grade

density tolerance from ±40 kg/m³

Reference	Density of block	Glass Transition Temperature	Compressive Strength	density_lb	post_name
XF901	760	120	57	47.4	xf901

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Syntactic Foam Blocks

A Wide Range of Densities for Each Depth and Requirement Down to Very Deepwater

Standards Blocks

High-Performance Foams for Demanding Environments

Macrosphere Foam

Lightweight

Reliable to shallow up to mid-depths

Typical usage depth : up to 1500 msw

Expanded Foam (Including PVC Foam)

Lightweight

Surface & shallow water depth compliant

Typical usage depth : up to 700 msw

Pure Syntactic Foam

Engineered for depths

Built to withstand pressure

Typical usage depth : up to 12 000 msw

High Performance Grade

Very Low Density Grade

Low Density Grade

Standard Grade

Selection Tool

Buoyancy Calculator

Insulation Foam Blocks

High Thermal Grade

Fire Resistant Grade

Need help choosing the right foam ?

ALSEAMAR sites

ROUSSET

Underwater Robotics & Acoustics – Marine Surveys

SIX-FOURS nord

Underwater Buoyancy Modules & Equipments

SIX-FOURS sud

Radiocommunication – Life Extension Services