Methodological base was developed for assessing the quality of firefighter - saviour combat clothing for use in the Arctic zone. It consists of a mathematical model for calculating the thermal state of special combat clothing in the «man — firefighter's combat clothing — working environment» system and a chamber climate test methodology with the participation of testers-volunteers. The results of some calculations of the firefighter's combat clothing thermodynamic state under the climatic factors exposure (negative values of the ambient temperature, wind load), and the fire thermal factors exposure are presented. Calculations were made based on the time and tasks performed, on the basis of actual working conditions of the firefighter. According to the calculation results we can conclude that in the considered range of variation of the environmental parameters of the working environment in the climatic conditions of the Arctic zone, the time of protective action of a multilayer stack of materials and tissues of the firefighter's combat clothing is determined by the time of reaching of the skin surface limit temperature cooling in the region of the unheated structural elements. In this case the heat flux is not a determining factor.
Verification of the model is carried out by comparing the results of experimental measurements and data obtained by calculation.
The climate chamber test methodology includes registration in the process of tests of the firefighter's combat clothing under-suit space thermodynamic parameters and the tester physiological parameters using both special sensors and displaying the results on a computer multiplier in real time mode. In addition, a visual assessment of the firefighter's combat clothing technical condition at the end of the tests is carried out.
Based on the results of the performed studies of the specific firefighter's combat clothing samples it can be concluded that the developed methodological base allows to perform the objective assessment of the Arctic version of the firefighter's combat clothing according to the application indicators that determine the quality of the product, and can be used to assess the quality of other personal protective equipment of a firefighter.