Black technical plate, Rivne region.

Technical plate TMKSH GOST 7338-90
Technical plate MBS GOST 7338-90
ТМКСЧ — heat-freezing acid-alkali resistant: air in rooms, tanks, vessels; nitrogen; inert gases at a pressure of 0.05 to 0.4 MPa or fresh, sea, industrial, sewage water without organic solvents and lubricants; acids, alkalis with a concentration of up to 20% at a pressure of 0.05 to 10.0 MPa.(//tractor-service.com)
MBS — oil and gasoline resistant, medium hardness: air in rooms, tanks, vessels; nitrogen; inert gases at a pressure from 0.05 to 0.4 MPa or oil and petroleum-based fuel,gasoline at a pressure from 0.05 to 10.0 MPa.
Working environment: fats, oils, emulsions, liquid hydrocarbon compounds, petroleum-based fuel
It is used for the manufacture of rubber products that serve to seal fixed joints, prevent friction between metal surfaces, to absorb single shock loads, and also as gaskets and flooring. It is used as damping elements (bumps, rubber shock absorbers, etc.), to eliminate vibration of industrial equipment, in communal services as sealing materials (gaskets) in sewage equipment and water supply.