Flammability, mechanical properties and structure of rigid polyurethane foams with different types of carbon reinforcing materials /E. Ciecierska a, ⇑ , M. Jurczyk-Kowalska a , P. Bazarnik a , M. Gloc a , M. Kulesza a , M. Kowalski b , S. Krauze b , M. Lewandowska a - Ciecierska,E.