① Hydrochloric acid

Among all kinds of acids for the chemical industry, hydrochloric acid is used most popularly, but it corrodes the materials of equipment most severely. STC-1 and 9000#, 862-200B# enamels have very excellent resistance to this corrosive acid.
As shown in this chart, corrosion resistance changes in the low concentration area, showing a peak at 1% and a minimum at 10%, but beyond 10%, it increases rapidly. This chart is also applicable to hydrobromic acid, hydriodic acid and chloroacetic acid.