Avient’s Dyneema® DM20 Fiber Earns ClassNK Type Approval for Floating Offshore Wind Turbine (FOWT) Mooring Solutions

July 8, 2026

Avient’s Dyneema® DM20 Fiber Earns ClassNK Type Approval for Floating Offshore Wind Turbine (FOWT) Mooring Solutions, as pictured in the above European FOWT demonstration projects; Left:  Stiesdal TetraSpar demonstration project (2021, 3.6 MW), photo courtesy of Stiesdal. Upper Right: WindFloat Atlantic (2019, 3 x 8.4 MW) and Lower Right: WindFloat Kincardine (2020/21, 5 x 9.5 MW), photos courtesy of Principle Power.

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Key Highlights

• Proven performance: The certification validates Dyneema® DM20 fiber for permanent mooring lines, offering developers a proven, fatigue-resistant alternative to traditional steel chains in demanding marine environments.
• Global track record: Over 100 MW of floating offshore wind capacity in Europe currently relies on Dyneema® DM20 fiber.
• Expanding adoption: The ClassNK certification supports broader adoption of synthetic mooring lines made with Dyneema® DM20 fiber in Japan’s rapidly growing offshore wind market.

CLEVELAND – July 8, 2026 – Avient Corporation, an innovator of materials solutions, today announced that its Dyneema® DM20 fiber has received Type Approval from Nippon Kaiji Kyokai (ClassNK) for use as filament in synthetic fiber ropes for floating offshore wind turbine (FOWT) mooring applications. As the offshore wind market expands globally, developers require reliable, long-term mooring materials. This certification validates Dyneema® DM20 fiber for permanent subsea installations, serving engineers, developers, and mooring line manufacturers.

As floating offshore wind projects scale, mooring system performance plays a critical role in overall system reliability and long-term operation in demanding conditions. The ClassNK certification, issued in February 2026 and valid through February 2031, confirms that Dyneema® DM20 fiber complies with ClassNK guidelines for floating offshore wind turbines, including NKRE-GL-FOWT01 and related standards for marine materials and equipment.

Dyneema® DM20 Fiber For FOWT Mooring

Dyneema® DM20 fiber is a high-modulus polyethylene (HMPE) fiber that is molecularly engineered at the polymer level to resist fatigue under sustained, permanent loads. As a result, it is an excellent option for permanent mooring lines and subsea tether installations requiring high resistance to creep and long-term fatigue.

Proven Track Record

The ClassNK Type Approval builds on a strong operational track record across Europe, where Dyneema® DM20 fiber has already been deployed in several landmark FOWT demonstration projects. These projects include WindFloat Atlantic (2019), WindFloat Kincardine (2020/21), TetraSpar (2021), and the EFGL project in the Golfe du Lion. In total, more than 100 MW of floating offshore wind demonstration capacity in Europe has been installed with Dyneema® DM20 fiber-based mooring systems, providing valuable operational experience as the industry moves from demonstration to larger-scale deployment. Building on this foundation and its recent ClassNK certification, Dyneema® DM20 fiber is well-positioned to support Japan’s fast-growing FOWT industry.

“Receiving Type Approval from ClassNK marks a major milestone for Dyneema® DM20 fiber. It reflects both the proven performance of the fiber and its growing adoption in the floating offshore wind industry. As one of the world’s most respected classification societies, ClassNK’s certification gives developers, engineers, and mooring line manufacturers in Japan the assurance to confidently specify Dyneema® DM20 fiber in demanding mooring applications,” said Pieter Lemstra, Global Business Director, Marine & Industrial Fibers at Dyneema®, Avient.

Collaboration in Japan

In 2025, Avient signed a general agreement with Toyobo MC to collaborate on the use of Dyneema® DM20 fibers for FOWT mooring solutions in Japan. With the addition of ClassNK certification, this collaboration supports broader adoption of synthetic mooring solutions in Japan’s emerging floating offshore wind market.

To request a sample or submit a technical inquiry, visit www.avient.com or www.dyneema.com.

About Avient

Our purpose at Avient Corporation (NYSE: AVNT) is to be an innovator of materials solutions to help our customers succeed, while enabling a sustainable world. Our local touch and customer engagement, combined with our global presence, allows us to serve customers with agility. We harness the collective strength of more than 9,000 employees worldwide to collaborate and build on each other’s ideas. In doing so, we innovate solutions that help our customers overcome their challenges or capitalize on opportunities provided by the fast-changing world and secular trends. Our expanding portfolio of offerings includes colorants, advanced composites, functional additives, engineered materials, and Dyneema®, the world’s strongest fiber™. By intersecting our broad portfolio of technologies with the product roadmaps of our customers, we help create differentiated and high-performance products that make the world better and more sustainable. Visit www.avient.com to learn more.  

About ClassNK

ClassNK is a leading third-party certification body that surveys and certifies ships, marine structures, and offshore facilities. As a prominent member of the International Association of Classification Societies (IACS), ClassNK’s certifications help to ensure that offshore energy projects are recognized as seaworthy and insurable by maritime organizations and underwriters globally.

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Media Contact
Crandall Turner
Avient Corporation
Crandall.Turner@avient.com