Fine-grain stainless steels in this paragraph are defined to be fine-grain austenitic stainless steels with an ASTM (or equivalent standard) grain size number of 5 or greater.

(b) galvanized steel test specimens shall not exhibit

41 (1) Every “A” Class division shall be constructed of steel or similar material, in either case stiffened so as to be capable of preventing the passage of smoke and flame throughout a standard fire test of 60 minutes duration; the division shall have an adequate insulating value having regard to the nature of the spaces adjacent thereto, and if the division is between spaces either of which contains adjacent combustible material, it shall be so insulated that, if either face of the division is exposed to a standard fire test of 60 minutes duration, the average temperature on the unexposed face of the division will not increase at any ...[+++]time during the test by more than 139°C above the initial temperature on that face nor shall the temperature at any one point thereon increase by more than 180°C above the initial temperature.

(a) it corrodes SAE 1020 steel or 7075-T6 non-clad aluminum surfaces at a rate exceeding 6.25 millimetres per year at a test temperature of 55°C when tested in accordance with Test Method, Laboratory Corrosion Testing of Metals for the Process Industries, NACE Standard TM-01-69 (1976 Revision);

(a) metal test specimens made of aluminum, copper and steel shall not exhibit any perforation; and

Steel sheets of at least 2 mm thickness and aluminium sheets of at least 5 mm thickness are deemed to comply with the integrity requirements without testing.