The feasibility of protecting thermally stressed surfaces of gas-transfer units with heat-resistance polyimide paint materials with mineral fillers is explored. Properties of polyimide paint materials containing different fillers are compared. It is demonstrated that of the compositions examined, a paint material based on a PI-LK-2 paint with the addition of 5‐10 wt.% of kaolin, and one based on a PI-LK-1 paint with the addition of 5 wt.% of a chopped basaltic fiber afford the best thermal stability. In transporting natural gas, it is necessary to ensure and maintain basic components of the gas-transfer equipment in good working order. One of the indicators characterizing the operational reliability of gas-transfer units (GTU) is their corrosion resistance. In GTU, the exhaust run and exhaust flue are most subject to corrosion, since these assemblies operate under the most difficult conditions (effect of gaseous flow at temperatures ranging from 380‐450°C, solar radiation, and moisture content. The heat-resistant paint materials (PM) traditionally employed ‐ KO-814, KO-85, and KO-811 applied in five layers ‐ do not provide corrosion protection for these assemblies under atmospheric conditions when they are stored in open areas for two years prior to their assembly. Fabrication of flues formed from corrosion-resistant steel appreciably raises the cost. Moreover, a temper color is formed on the flue, degrading its commercial appearance. The development of new heat-resistant materials satisfying all operating conditions is therefore a critical problem. In compiling PM formulations, the film carrier is the determining component. The properties of the coating can be substantially altered by chemical modification or introduction of another film carrier (as a rule, more expensive), but this is economically inexpedient and labor-intensive, since replacement of the film carrier usually also results in the need to replace other components. A simple and more effective means of regulating PM properties is the introduction of small amounts of different fillers to the formulation. In certain cases, use of fillers is a unique possibility of achieving the properties required. Owing to the high physico-mechanical properties and thermal stability in the 200‐250°C interval, aromatic linear polyimides as a film carrier, and kaolin, milled mica, basalt, and hollow glass microspheres as fillers of mineral origin, are of greatest practical interest. Kaolin is a chemically inert material consisting wholly or partly of alumosilicate kaolinite. Milled and classified grades of kaolin may contain small amounts of related plate silicates (micas, illite, chlorite, smectite) and quartz. The majority of kaolins used in the paint industry are washed to remove these mineral impurities. Kaolin possesses a plane structure, but in contrast to talc and mica, its role in the coating is determined to a larger degree by the contribution to the optical than to the physical properties of the coatings. Kaolins are used to improve thixotropic properties, flowability, leveling properties,