Metal Finishing Guide Book

2011-2012 Surface Finishing Guidebook

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Table II. Physical Properties of Asphaltic Linings Value Property Softening point, O Ash, max., % Penetration 77O F (25O 115O F (46O F (O C) C), 100 g—5sec. C), 50 g—5sec. Chemical resistance Type A 200-225 (93-107) 0.5 38 75 Very good Type B 250-275 (121-135) 0.5 18 27 Very good as well as other types of linings. The physical properties and the chemical resis- tance of asphaltic linings are shown in Tables II and III, respectively. Adhesive-bonded sheet linings, such as various plasticized plastics, rubbers and elas- tomers are most commonly used for steel tanks. Successful applications have been made on concrete; however, it is not the most desirable substrate on which to bond and cure many of these systems. The physical properties and the chemical resis- tance of sheet linings are shown in Tables IV and V, respectively. Mechanically bonded rigid plastic linings for precast and poured-in-place concrete tanks are a relatively new concept. Instead of bonding with adhesives, this system uti- lizes anchor studs sonically welded to the back of the sheet for locking or mechanically bonding the sheet to the concrete. Ambient temperature-cured, spray- and trowel-applied synthetic resin lining Table III. Chemical Resistance of Asphaltic Linings Medium Aluminum salts Cadmium salts Chromic acid, to 10% Copper salts Gold cyanide Hydrochloric acid Hydrofluoric acid Iron salts Magnesium salts Nickel salts Nitric acid, to 20% Perchloric acid Phosphoric acid Sodium chloride Sodium cyanide Sodium hydroxide, to 30% Sodium salts Sulfuric acid, to 50% Trichloroethylene Trisodium phosphate Zinc salts 626 Type A R R R R R R C R R R C NR R R R R R R NR C R C, conditional; R, recommended; NR, not recommended. Type B R R R R R R C R R R C NR R R R R R R NR C R

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