In the master's thesis, we address the issue of choosing a suitable core for interior fire doors, which must provide fire resistance of class EI30 or EI60, but at the same time must not exceed the permissible mass, since excessive material density makes it difficult to manufacture and install door leaves. The purpose of the research was to compare different materials regarding their fire resistance and weight, and to highlight those that combine both requirements. We included expanded cork, 42 mm and 32 mm thick chipboard, vermiculite board, rock wool and fireproof particleboard in the research, and also tested plywood and MDF, which are important parts in the composition of door leaves. The materials were tested according to the standard method SIST EN ISO 11925-2:2020 (single flame test), where we monitored the height of damage and the occurrence of ignition, and also according to the non-standard hot plate method, where we monitored mass loss, change in thickness, change in temperature and burning rate. After the tests, the samples were analysed with a digital microscope, where the thickness of the pyrolyzed and burned layer was measured. The results of all measurements showed that the highest resistance was achieved by expanded cork, 42 mm particleboard, vermiculite, rock wool and fireproof particleboard. The lowest weight was achieved by compositions with cork, 42 mm chipboard, vermiculite, 32 mm chipboard and rock wool. The materials that combine both goals are expanded cork, 42 mm particle board, vermiculite and rock wool. The latter materials are inorganic, so it is worth emphasizing that despite their good fire-proofing properties, they require special processing both when cutting and gluing.
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