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The use of calculation methods for verifying the fire resistance of insulated metal (steel or aluminum) structures requires data on the thermal properties of fire protection materials. A testing methodology has been developed within CEN TC 127 "fire in buildings" and one of the possible assessment methods provides a method for deriving the thermal conductivity of protection materials from fire test results performed on insulated sections. To check the accuracy of this assessment method, a theoretical study has been carried out using products with well-defined material properties. It was found that the thermal conductivity obtained by this assessment method is slightly different from the "measured" values, and a better consistency between calculated and experimental data could be reached by improving the definition of the section factor and using a corrected thickness for fire protection materials.