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The growing demand for environmentally sustainable materials with improved performance has led to a notable rise in the production of thermally modified (TM) wood, including ash wood (Fraxinus excelsior L.). Although TM wood offers enhanced functional properties and durability, it still has a finite service life. Comprehensive experimental investigations have revealed that prolonged environmental exposure (over 24 months) significantly affects the surface quality of thermally modified ash (TM-Ash) wood.

A technology of briquetting of sub-standard coal of Kazakhstan fields to obtain high-quality briquetting fuel has been developed. A modifying additive in the form of oil residues has been selected, that make it possible to obtain a binder composition for brown coal briquetting. The material for the preparation of coal briquettes is coal fines from dry, poorly sintered coals, which cannot be used for direct combustion in the furnace. The optimal parameters for obtaining high-quality fuel briquettes have been determined.