The surfboard fin company says that "when you initiate a turn, H4 will supply speed when you need it, and then release it at the ideal transition point."

It all started with the H2 Elliptic fin, which married a nautical-inspired template, a unique side fin foil, and extreme cant angles.

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These foils also create a very high stall limit providing a feeling of predictability through the most acute turns and in critical wave moments.

Recycling through stripping and washing typically left traces of silicone, which degrades the resin and contaminates molds during injection molding. Another issue is the high viscosity of airbag yarn limiting high-flow applications in thin-wall and other injection molding processes.

All in all, the H4 Series promises to create maximum power output for effort, minimal drag for optimum speed, and deliver a feeling of predictability and effortless control at every riding moment.

Toray has developed recycled plastic products derived primarily from post-industrial scrap materials from in-house production processes, undertaking such efforts as recycling used air conditioner parts into new ones. It aims to extend recycling to used automotive parts and industrial equipment.

The center fin's tapering elliptical outline offers progressive stalling behavior at the most critical moments, meaning the fin will release precisely when you need it.

"We applied our learnings to the H3 Nexus and took it one step further by combining an elliptical template with a three-dimensional flex pattern that could harness and release energy in the form of projection and speed."

Toray combined specific additives to prevent residual silicone from migrating to the surface of molded products. It also greatly reduced mold adhesion. The flowability and mechanical properties of recycled PA 66 using Toray’s technology reportedly is on a par with virgin PA 66.

Japan’s Toray Industries has developed a recycled polyamide (PA) 66 material recovered from silicone-coated airbag fabric scrap cuttings. This grade reportedly achieves the same flowability and mechanical properties as virgin PA 66 injection molding grades.

Toray intends to launch Ecouse Toraycon as a chemically recycled polybutylene terephthalate (PBT) resin exhibiting properties equivalent to virgin materials. It will keep assessing material recycling and chemical recycling for its own polymers in its drive to expand the Ecouse lineup by debuting such products as Ecouse Toyolac acrylonitrile butadiene styrene (ABS) and Ecouse Torelina polyphenylene sulfide (PPS).

Toray Industries has developed recycled polyamide (PA) 66 from recovered silicone-coated airbag fabric scrap that achieves the flowability and mechanical properties of virgin PA 66.

Furthermore, the hatchet-like shape of the tip creates stability and a feeling of control and certainty under extreme loads.

Industrial recycler Refinverse Group strips the silicone from airbag fabric scrap cuttings and cleans the recovered plastic, which Toray then uses to create the PA 66 grade by combining the resin with specific additives. Toray will debut the new offering under the brand name Ecouse (pronounced Eco-Use) Amilan. Toray established the Ecouse brand in 2015 for eco-friendly recycled materials and products.

The base is skewed forwards, offsetting the high rake angle in the tip to minimize drag, maximize speed and maintain the smooth turning nature of a more traditional shaped template.

So, FCS teamed up with a Swiss company to use precision injection molding and fused unidirectional carbon to produce a fin that optimizes all variables - materials, geometry, and flexibility.

"The project has always been about pushing boundaries and adapting functional design theory to hardware with a goal to enhance the surfing experience through a better performing fin," FCS explains.

With a focus on speed, newly developed foils on the side and center fins significantly lower drag and introduce flex in the upper half of the fin precisely where it's needed.

PA 66 fabric used in airbags can be either silicone-coated or non-coated. Manufacturers normally recycle the scrap cuttings of non-coated fabrics. Recycling coated airbag fabric scrap cuttings requires removing the silicone. Refinverse was the first in Japan to achieve commercial-scale silicone-coated fabric recycling.

The Qiantang River in China is home to the world's largest tidal bore. It is also the spiritual crib of the country's first wave riders.

The side fin's upper section serves to produce instantaneous acceleration from take-off to bottom turn via an efficient rebound effect.

Toray plans to start full-fledged sample shipments of Ecouse Amilan in April 2023 at the soonest It ultimately plans to procure recycled raw materials at its overseas sites to establish a global supply system. It will also explore commercializing recycled PA 66 products made from airbags recovered from end-of-life vehicles.

FCS states that the two radically different side and center fin templates create a set with ultimate speed and drive that doesn't compromise control or maneuverability.