Avient Dyneema DM20 fiber gains ClassNK approval for floating wind mooring

Avient Corporation said its Dyneema DM20 high-modulus polyethylene fiber received ClassNK Type Approval for use as filament in synthetic fiber ropes for floating offshore wind turbine mooring. The certification was issued in February 2026 and is valid through February 2031, covering ClassNK guideline NKRE-GL-FOWT01 and related standards. The body says more than 100 MW of floating offshore wind capacity in Europe already uses DM20-based mooring systems, and Avient has a 2025 general agreement with Toyobo MC for Japan.

Key facts

Market context

High-modulus polyethylene (HMPE) fiber is an ultra-high-molecular-weight polyethylene valued for very high strength-to-weight ratio, low density, and resistance to water and UV exposure. It is widely used in synthetic ropes, lifting slings, marine lines, and cut-resistant textiles. Demand is driven mainly by marine and offshore energy, defense and protective apparel, and industrial rope markets. Floating offshore wind is an emerging use where synthetic fiber lines can replace heavier steel chain in mooring systems, reducing weight and handling loads on floating platforms. Certifications from classification societies such as ClassNK are often a gating step before developers and mooring manufacturers can specify a new material in a project. Approval in a new national market can open qualification pathways for fiber suppliers and rope makers, while competition in HMPE comes from other producers of comparable high-modulus fibers. Actual volume effects depend on project pipelines and the pace of floating wind build-out.

Source: official release on avient.com. Summary and context written by Market Krystal.