Phenol-formaldehyde (PF) resins hold a significant share in the market of thermosetting materials . In 2023, 750-800 ktons of phenolic resins were produced in Europe, with BI-QEM manufacturing 3-5% of the total volume. PF are widely used in the mineral wool, wood and laminates industries, where customers require tailored formulations to meet specific production and performance requirements. Traditionally synthesized from fossil-based phenol and formaldehyde, phenolic resins face increasing pressure to transition toward more sustainable alternatives. While biomass-derived phenol is a potential solution, its high cost remains a barrier. Naturally occurring polyphenols, such as lignin and tannins, present a more viable and direct replacement.Tannins, primarily extracted from bark and wood, are commercially available and used in tanning, corrosion protection, and as additives in food and fragrances. Their high reactivity makes them a promising alternative to petroleum-based phenol in resin formulations. Lignin, a by-product of the pulp and paper industry, was long considered a low-value material but is now gaining recognition as a renewable material for high-performance applications, including resin production. In Sweden, both lignin and tannins are being produced or are expected to reach industrial-scale production, providing new opportunities for bio-based resins.This study aims to develop fully bio-based materials using lignin and tannins, combined with green-formaldehyde alternatives such as glyoxal or furfural. Initially, lignin- and tannin-containing resins are being evaluated at the laboratory scale in our R&D facilities and in collaboration with RiSE. Further research will explore formaldehyde-free alternatives to enhance the environmental and safety profile of these resins. Finally, feasibility studies will be conducted in a 0.5 m³ reactor to assess the potential for scale-up and commercialization. The successful development of these bio-based phenolic resins would enable BI-QEM to reduce dependence on fossil-derived raw materials, lower the carbon footprint, and source materials domestically, all while maintaining performance standards.