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→13.2.1.2 Porosity
Frequently a SO test at higher concentrations (100 ppm) and high humidity 2 levels (95% RH at 40°C) is used. One advantage of this method is that the severity level can be increased easily by varying the concentration of SO<sub>2</sub>. Besides these, other corrosive gas mixtures of H<sub>2</sub>S, SO<sub>2</sub>, and NO<sub>2</sub> are used in porosity tests (i.e. tests according to ASTM B735 and B 799).
====13.2.1.3 Hardness====
