Driving on eggshell – not walking on them – can be a good thing.
Stelantis is looking for a patent in a process of incorporation, or other Bio SASTE materials, to tires to increase their environmental impact.
In the patent file published by the US Patent and brands office (USPTO) on January 23, 2025 and submitted in 2023, the auto industry company discusses the use of eggshell as a substitute for common tire filling materials: black carbon and silica.
As wearing tires, both black carbon and silica are launched in the air as dust, as indicated by stellantis. In fact, a study published in 2023 found that tire dust could be an important source of particle emissions. But Stelantis believes this filling can be replaced by calcium oxide (CAO) derived from eggshell.
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Chicken eggs shrink more than 90 % of calcium carbonate (CACO3), and CAO can be extracted using a calcification process – first washing it in acetone, then exposed to temperatures of not less than 1652 degrees Fahrenheit, causing shells to decompose.
Carbon dioxide (CO2) is given, leaving behind CAO as a white hardening, according to the patent deposit. Then this substance is grinded to the form of black carbon filling or silica, and mixed with rubber and other materials to form the tire compound.
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It is not clear whether this will be proven commercially, especially given that it grew up with a car manufacturer, not tires. But actual tire manufacturers add more sustainable materials to their tires, which will be decisive in reducing the environmental impact of driving. As tail tube emissions continue with increased EV adoption, other pollution sources – such as tires should be treated.
Bridgeston said last year that it was producing tires for the entire Audi E-Tron GT, which used 55 % of recycled and renewable materials, and that it was built into natural rubber from the desert bush to Indycar Race Tires. In 2022, Michelin said it would develop environmentally friendly tires in partnership with Hyundai, and Goodyear showed a demonstration of the use of oil -based materials, as well as emissions from production.
