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Flexsys Moves Forward with 6PPD Alternatives

Flexsys, a prominent name in material science and tire additives, has recently unveiled significant advancements in its efforts to develop a sustainable substitute for 6PPD (N-(1,3-dimethylbutyl)-N'-phenyl-p-phenylenediamine), a chemical often used in tire manufacturing. This announcement marks an important step towards achieving safer and more environmentally friendly tire production methods.

In November 2025, Flexsys made headlines by announcing the creation of the world’s first viable alternative to 6PPD. Following up on that, the company has officially narrowed down its focus to the final two candidate molecules that will undergo extensive testing. These alternatives have been designed to not only meet but exceed the rigorous safety, performance, and environmental benchmarks set by Flexsys and its partners.

The newly selected candidates are notable for being outside the traditional PPD chemical family, thus avoiding the formation of potentially harmful quinone transformation products during use. Furthermore, extensive lab tests conducted within Flexsys and by external industry partners have confirmed the candidates’ promising attributes.

To further validate the safety of these alternatives, Flexsys has entered into a Cooperative Research and Development Agreement (CRADA) with the U.S. Geological Survey (USGS). This partnership will facilitate independent studies focused on the aquatic toxicity of these molecules, essential for ensuring that they are safe for both tire performance and environmental sustainability. The USGS has devised advanced methodologies that go well beyond typical assessments required for new chemical registrations, underscoring the thoroughness of this research effort.

According to Carl Brech, CEO of Flexsys, the tire industry has long awaited a reliable alternative to 6PPD coupled with promising independent safety validations. With testing in progress, the company is pivoting from just finding potential replacements to ensuring regulatory approval and eventual adoption across the industry.

Safety and environmental integrity are paramount, especially when introducing any new chemical to the manufacturing process. As a significant factor for success, USGS's Western Fisheries Research Center will conduct evaluations on the potential effects that these molecules may have on important aquatic species like Pacific salmon. As such, the research prepared under this agreement will establish novel testing methods that can better assess aquatic toxicity not just for 6PPD replacements, but for all new chemical introductions.

Neil Smith, Chief Technology and Sustainability Officer at Flexsys, expressed confidence in their approach, emphasizing that the two final candidate molecules consistently fulfill all necessary criteria concerning performance, scalability, and safety. Such a robust testing framework guarantees that the selected alternative will be safe and effective for decades to come. The independent evaluation by USGS shoulders an additional level of rigor that has proven essential for validation.

Flexsys also acknowledges support for their efforts through the Economic Development Administration's Tech Hubs Program, participating in the Akron Sustainable Polymers Tech Hub and supported by Jobs Ohio. This collaboration is crucial, considering the need for community and industry alignment to catalyze the commercialization of these alternatives.

Michael Schmidt, Center Director at the USGS Western Fisheries Research Center, highlighted that extensive studies on 6PPD's effects on aquatic life have been ongoing for the past five years, leading to the developing of innovative methodologies for screening the safety of the alternatives.

As Flexsys streamlines its production processes for the two candidate molecules, it remains focused on achieving global regulatory approval to facilitate their commercial use. The current candidates rely on a chemistry framework similar to that of 6PPD, simplifying the transition for manufacturers and minimizing associated costs. This strategy is set to accelerate the adoption of safer chemical alternatives throughout the tire industry.

Flexsys, with operations spanning across continents and utilizing state-of-the-art facilities, remains committed to pioneering sustainable advancements in the rubber and tire sectors. Its portfolio, including well-known products like Crystex™ and Santoflex™, showcases the company’s dedication to improving the durability and ecological impact of rubber products.

For more information about Flexsys, visit Flexsys.com.