Classification Tests of the Reaction to Fire of Modified Cellulosic Materials Encrusted with Expandable Graphite

Despite a large amount of data on innovative fire protection technologies for wood and lignocellulosic materials, the primary trend is creating fire retardant preparations using compounds based on phosphorus and/or boron. Additives that promote the formation of a char layer during the combustion of lignocellulosic materials are effective flame retardants. Expandable graphite [EG] is undoubtedly one of the intumescent agents group’s more environmentally friendly flame retardants. The work aims to develop cellulose-based composite board materials with class B potential according to the EN 13,501–1 standard [1]. The materials manufacturing process includes the following stages: mixing additives and cellulose fibers, fiber flotation, water removal, and drying the final product. The materials were analyzed for fire properties in accordance with ISO 5660–1 [2], EN 13,823 [3] (the so-called SBI test), and EN ISO 11925–2 [4] (flammability from a small flame). As a result of the research, the influence of the presence of EG and boron compounds on the reaction to fire of the produced insulating board materials was demonstrated.