Sicomin Unveils Bio-Based SR GreenPoxy 550 Wood Coating Resin System Enabling High-Performance Sustainable Raceboat Construction

27 october 2025, Marseille, France: Sicomin is delighted to announce the launch of its latest innovation SR GreenPoxy 550, a fully reformulated bio-based epoxy system engineered for the bonding and lamination of timber-and-fibre composites.

SR GreenPoxy 550 has been developed as a sustainable alternative for one of Sicomin’s keystone legacy resins. After an extensive R&D program, SR GreenPoxy 550 delivers equivalent or improved handling and performance properties while eliminating all carcinogenic, mutagenic, and reprotoxic (CMR) substances.

Technical Advancements in SR GreenPoxy 550

• Bio-based formulation: Derived in part from plant sources, SR GreenPoxy 550 reduces reliance on petrochemical raw materials.

• Non-CMR chemistry: A completely re-engineered formulation with a clean material safety data sheet.

• Optimised processing: Excellent viscosity and reactivity tailored to hand lamination, reducing waste compared to infusion processes.

• Mechanical performance: High strength and stiffness at room temperature, with strong adhesion to a wide range of wood substrates.

• Surface quality: Excellent finish in cured laminates, meeting the demands of performance racing yacht construction.

“We believe SR GreenPoxy 550 is the only bio-based, non-CMR epoxy system for wood composites available on the market today,” déclare Marc Denjean, Sicomin. “We focused on replicating the best-in-class handling and mechanical properties of our previous resins while delivering a safer, more sustainable system. For our customers, it means the performance they expect with the environmental and HSE profile they need.”

Greenscow: SR GreenPoxy 550 in Offshore Racing Applications

The first major implementation of SR GreenPoxy 550 is the Greenscow project, a groundbreaking initiative led by naval architect Gildas Plessis to demonstrate low-carbon alternatives in offshore racing yacht construction. The Greenscow design uses epoxy-plywood sandwich composites combined with natural fibres such as flax and basalt to produce hulls that are both competitive and dramatically lower in embodied carbon.

Compared to a traditional full-carbon composite hull, a Greenscow epoxy-ply hull built with SR550 can reduce construction footprint by up to 80%, while offering:

• Comparable stiffness and structural integrity, with tailored fibre placement for load optimisation.

• Weight savings approaching carbon levels, particularly on smaller yachts such as the Mini 6.50.

• Improved repairability, longevity, and reduced end-of-life environmental impact.

The Kaori Concept yard in Brittany, specialists in epoxy-plywood construction, has already integrated 550 into its production process. Hand lamination was chosen not only to minimise material waste but also to align with the products processing profile, that enables skilled laminators to achieve high-quality, low-void laminates without the excessive consumable waste associated with vacuum infusion.

Early applications include the Greenscow 6.50 prototype, now in small-series production, as well as a new Class40 design. Looking further ahead, a 60ft foiling Greenscow IMOCA is fully engineered and planned for build ahead of the 2032 Vendée Globe.

“Plywood combined with basalt fibre and SR GreenPoxy 550 resin represents one of the best compromises we’ve seen between performance, durability, repairability and environmental footprint,” explique Flavien Gaulard, Directeur de Kaori Concept. “We’ve tested 550 extensively across different fibres and laminating processes, and its results are on par with traditional resins, with the added benefit of a sustainable chemistry.”

With SR GreenPoxy 550, Sicomin reaffirms its leadership in sustainable composite chemistry, providing designers, builders, and sailors with a proven, high-performance alternative for the next generation of raceboats. The product will be on display at METS 2025, Amsterdam.