TFAA – thermofrost-acid-alkaline plate, Working TMKL: ambient air, tanks, vessels; nitrogen; inert gases under pressure from 0.05 to 0.4 MPa; fresh, sea, industrial, wastewater without organic solvents and lubricants; salt solution with a concentration up to saturation; acids, alkalis with a concentration of not more than 20% under a pressure of 0.05 to 10.0 MPa. The plate has hardness: 35-65 units. Shore – soft (M), 50-65 units. Shore – average (C), 65-85 units. Shore – elevated (T). TU U22.1-42171243-001: 2020.
