[Hygienic evaluation of new brands of rubber intended for use in a water-supply system under high temperature and active chemical operating modes].

The paper presents the results of hygienic testing of new rubbers, IRP-2043 and IRP-1136. The rubber IRP-2043 does not change the quality of the water it contacts with. Water extracts of this rubber do not produce a toxic effect on homoiothermal animals. This rubber can therefore be recommended to be used in potable water supply systems. The rubber IRP-1136, when contacting with dechlorinated tap water, alters its organoleptic and physico-chemical properties. This rubber cannot be recommended for water supply systems. After a prolonged (18 months) exposure to the condensate of degradation products of the agent 0-30, urine conserving agent and a mixture of urine and the conserving agent the rubbers IRP-2043 and IRP-1136 do not alter physico-chemical and bacteriological properties of water or disturb physiological functions of homoiothermal animals. Having this in view, both rubbers can be used in water supply systems functioning at high temperatures and under the influence of active chemicals.