Influence of the Expandable Graphite on the Thermal properties of a Rigid Polyurethane Foam for constructionLenar Shafigullin, Natalya Romanova, Gulnaz Shafigullina and Yulia SokolovaE3S Web Conf., 263 (2021) 01009DOI: https://doi.org/10.1051/e3sconf/202126301009