Despite abundant data on innovative fire protection technologies tailored for wood and lignocellulosic materials, the prevailing approach revolves around the formulation of fire retardant solutions employing water-soluble salts, e.g., phosphorus or boron compounds. On the other hand, additives fostering the formation of a char layer during the combustion of lignocellulosic materials as a non-leaching retardant are expected on the market. Expandable graphite as an intumescent agent can be an environmentally conscious option that is not soluble in water fire retardants. This study aimed to manufacture cellulose-based composite boards that effectively protect against fire. The manufacturing process encompasses additive-cellulose fiber blending, flotation, moisture extraction, and final product drying stages. The fire properties of the materials were assessed by ISO 5660-1, EN 13823 (commonly known as the SBI test), and EN ISO 11925-2 (flammability from a small flame). The findings prove the impact of EG and boron compounds on the fire reaction of the manufactured insulating board materials, which were classified as Class B according to EN 13501-1.

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