The aim of this work was to investigate the possibilities of using natural materials such as cork and wood for fire-resistant and soundproof interior doors. These materials are considered as an alternative to existing commercial solutions, which are expensive, have a high density and are difficult to process. We investigated five types of composite materials with different combinations of cork, spruce wood, fibreboard and particleboard, including the commercial material Promat Promapyr. We tested the fire behaviour using two methods: a single-flame source test according to the SIST EN ISO 11925-2:2020 standard (edge and surface) and a non-standardized test on a hot plate at 450° C, where we measured the surface temperature and mass loss. In the fire reaction test, none of the test specimens reached the critical damage height of 150 mm. The best thermal insulation results were achieved by composites with a higher cork content, while the highest mass loss and surface temperatures were achieved by Promapyr and composites with a cork-wood-cork composition. The results confirm that with the right combination of cork and wood, it is possible to produce lighter, more environmentally friendly and cost-effective composites that have adequate fire resistance and are a suitable alternative to existing fire-rated door cores.
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