Deep and ultra-deepwater projects require buoyancy on risers, umbilicals, and equipment to make them more functional, more reliable, and less costly to install. Syntactic foams made with Proxima STR thermosets can provide the uplift in buoyancy modules for drilling, installation, and production.

Proxima STR Thermosets for Subsea Buoyancy

Syntactic foams are lightweight materials with high compressive strength that provide a buoyant force to heavy subsea structures and can withstand the severe hydrostatic pressures of deepwater and ultra-deepwater. Syntactic foams for subsea buoyancy are made by incorporating lightweight hollow glass microspheres into a rigid polymer matrix. Proxima STR resins enable syntactic foams that are uniquely lighter and easier to manufacture than those based on polyurethane or epoxy resins.

High quality large castings >30” sections, with no post-cure
Low end-of-life water absorption
Excellent strength-to-weight ratios
Exceptional durability
Compatible with composite macrospheres

Experience the Advantage of Proxima STR Thermosets

Proxima STR resins for subsea buoyancy combine the processing ease of polyurethanes with better-than-epoxy performance and reliability. Proxima STR products enable manufacturers of subsea buoyancy products to reduce manufacturing costs while offering a next generation product with improved buoyancy characteristics—delivering true competitive advantages.

Reduce Manufacturing Costs

Unlike epoxy syntactic foams, which are commonly processed in small multi-layer sections, Proxima STR resins can be cast into large units >250 liters in a single casting step without post-cure.

Proxima STR resins are processed in a “set it and forget it” manner for greater productivity and the two-part resin system is compatible with standard thermoset processing equipment.

Cure Rate

Proxima STR resins provide a broad range of reactivity and cure rates that can be adjusted to specific manufacturing requirements.

Improve Buoyancy Performance

Proxima STR resins have inherently low viscosity, making it easy to process even at microsphere loadings up to 60% by volume. Combined with a resin that’s 10-15% lighter than standard epoxies, Proxima users produce a lower density foam product with improved uplift.

Higher Buoyancy Retention

The unique chemistry of Proxima STR polymers provide inherently low water absorption, delivering excellent buoyancy over the lifetime of products.

High Compressive Strength and Toughness

Buoyancy products made with Proxima STR resins have the compressive strength to withstand ultra-deep water environments and the toughness to withstand deployment and redeployment.

Properties and Highlights

Proxima STR resin systems for subsea buoyancy offer working times that range from 30 to 60 minutes.

30-Minute System

Proxima STR resins are compatible with standard microspheres and macrospheres.

Proxima STR 3105 Resin
Property Test Method Units Value
Density ASTM D792 g/cc 1.03
Viscosity - cP 10 – 20
Heat deflection temperature (HDT), 264 psi ASTM D648 °C 130 – 165
Working time (30 °C) - min 30
Sample Syntactic Foam
Property Test Method Units Microsphere Type
K1 K20 S32
Microsphere Loading % v/v 56 56 56
Density ASTM D792 g/mL 0.54 0.57 0.62
Compressive strength ASTM D695 MPa 30 46 61
Compressive modulus ASTM D695 MPa 1300 1500 1800
60-Minute System

Proxima STR resins are compatible with standard microspheres and macrospheres.

Proxima STR 3115 Resin
Property Test Method Units Value
Density ASTM D792 g/cc 1.03
Viscosity - cP 35 – 50
Heat deflection temperature (HDT), 264 psi ASTM D648 °C 130 – 165
Working time (30 °C) - min 60
Sample Syntactic Foam
Property Test Method Units Microsphere Type
K1 K20 S32
Microsphere Loading % v/v 56 56 56
Density ASTM D792 g/mL 0.53 0.58 0.63
Compressive strength ASTM D695 MPa 24 36 58
Compressive modulus ASTM D695 MPa 1100 1400 1700
Ultra-Low Water Absorption

Superior water absorption properties and high retention of buoyancy.


Product Applications

We’ve formulated the entire line of Proxima STR thermosets to be user friendly and customizable. Nearly every property can be fine-tuned to integrate into any number of products. If you have a specific product need, contact our materials science team for the exact solution to your needs.

Ideal for:
  • Distributed Buoyancy
  • Drill Riser Buoyancy
  • Installation Buoyancy
  • ROV Buoyancy

Are you looking for advanced material solutions?

Materia has a wide range of Proxima formulations available and the expertise to develop highly tuned thermosetting resin systems for your performance and processing requirements.

Contact the Experts