In the article the calculation of time of technologically admissible volume of losses of coolant due to diffusive permeability through walls of cameras of branch pipes of refrigerators with the given technical characteristics is executed. The guaranteed resource of work of branch pipes was 14,1 and 7,4 years respectively for one and second machines. Experimental researches of influence of type and structure of fillers on diffusive permeability are carried out on rubbers: 61-202 on the basis of a chloroprene of S-40 and RK-1802 on the basis of the hydrogenated ZETPOL-2000 rubber, at the acceptable technological indicators of processing and production of rubber cameras. The optimum share of filling of rubber mix is experimentally chosen – 20% of mass parts as ground mica. For ensuring long resistance of rubber to influence of coolant as basic it is recommended to use ZETPOL-2000 brand rubber hydrogenated.