
Researchers have developed a bio-based, formaldehyde-free phenolic resin derived from lignin that provides fire protection, strong adhesion, and zero toxic off-gassing for timber products.
Published in the journal Green Chemistry, the study details how the new material, dubbed SALG-PR, functions as both a high-strength structural wood adhesive and an effective surface coating.
In laboratory testing, timber treated with the bio-resin prevented burn-through during 300 seconds of direct torch exposure while releasing negligible formaldehyde emissions compared to conventional options. The development points to a promising upcycling path for pulp mill lignin while addressing increasingly strict indoor air quality and fire safety standards.
Source: European Coatings
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