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Researchers have developed a new eco-friendly cardanol-based polyurethane (PU) coating that provides superior corrosion protection and mechanical strength for steel, marking a breakthrough in sustainable industrial coatings.
Derived from cashew nut shell liquid (CNSL), cardanol is a renewable phenolic compound used to create bio-based polyurethanes with high performance and reduced environmental impact. According to a report published by European Coatings, the innovative coating demonstrated excellent corrosion resistance, scratch hardness of 2 kg, and impact strength up to 150 lb/in, outperforming many conventional petrochemical-based coatings.
The material’s unique molecular structure offers a strong balance of hardness, flexibility, and barrier properties, making it suitable for industrial, marine, and infrastructure applications where corrosion remains a critical challenge.
Experts say this development aligns with the industry’s push toward low-VOC, bio-based coatings as manufacturers seek sustainable alternatives that meet environmental and performance standards.
If commercialized, the cardanol-based PU coating could significantly extend the lifespan of steel structures while reducing maintenance costs and carbon footprint, supporting global efforts toward green manufacturing and circular materials innovation.
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