Metal Finishing Guide Book


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Table II. Physical Properties of Asphaltic Linings Value Property Type A Type B 200-225 (93-107) 250-275 (121-135) Ash, max., % 0.5 0.5 Penetration 77OF (25OC), 100 g���5sec. 115OF (46OC), 50 g���5sec. 38 75 18 27 Very good Very good Softening point, OF (OC) Chemical resistance metallic substrates. These lining systems utilize such filler reinforcements as flake glass and mica. Fabric reinforcements such as fiberglass are the most common; however, synthetic fabrics are used where fluorides are present. These linings are extremely versatile and can be applied by maintenance personnel with skills in the painting and masonry trades. Most manufacturers of these lining systems provide training programs for plant maintenance personnel. The physical properties and the chemical resistance of ambient-cured synthetic resin lining systems are shown in Tables VI and VII, respectively. The tables shown above all provide the design and corrosion engineer with basic information on the various lining systems discussed. They identify specific corrosives encountered in various metal-finishing operations. Enumerated are each of the various types of linings and a general recommendation for its use in the parTable III. Chemical Resistance of Asphaltic Linings Medium Type A Type B Aluminum salts R R Cadmium salts R R Chromic acid, to 10% R R Copper salts R R Gold cyanide R R Hydrochloric acid R R Hydrofluoric acid C C Iron salts R R Magnesium salts R R Nickel salts R R Nitric acid, to 20% C C Perchloric acid NR NR Phosphoric acid R R Sodium chloride R R Sodium cyanide R R Sodium hydroxide, to 30% R R Sodium salts R R Sulfuric acid, to 50% R R NR NR Trisodium phosphate C C Zinc salts R R Trichloroethylene C, conditional; R, recommended; NR, not recommended. 795

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