Metal Finishing Guide Book


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Table VI. Physical Properties of Ambient-Cured Synthetic Lining Resin Systems Temperature Resistancea Type Max., OF (OC) Furan 125 (52) Excellent Epoxy 160 (71) Very good Polyester 180 (82) Very good Vinyl ester 160 (71) Very good Urethane 150 (65) Good Chemical Resistance a Suggested limit without a masonry sheathing. strued as hydrostatically tight tank linings. They are, in fact, porous, and consequently must be considered as chemical, physical, and thermal barriers for protecting membranes installed behind these sheathings. Brick sheathings contribute to the longevity of tank linings by offering additional chemical, thermal, and physical protection. They are excellent insulating barriers and, consequently, can be considered as energy savers. PLASTIC TANKS AND LININGS There are a multitude of plastics available for solving corrosion problems in the metal-finishing industry. The more popular and cost effective are polyvinyl chloride (PVC), Type I; polypropylene (PP); linear polyethylene (PE); and fiberglass-reinforced plastics (FRP). Table VII. Chemical Resistance of Ambient-Cured Synthetic Resin Lining Systems Medium Aluminum salts Cadmium salts Chromic acids, to 10% Copper salts Gold cyanide Hydrochloric acid Hydrofluoric acid Iron salts Magnesium salts Nickel salts Nitric acid, to 20% Perchloric acid NR Phosphoric acid Sodium chloride Sodium cyanide Sodium hydroxide, to 30% Sodium salts Sulfuric acid, to 50% Trichloroethylene NR Trisodium phosphate Zinc salts 1a R R NR R R R Rb R R R NR NR 2 R R NR R R R R R R R NR NR 3 R R R R R R R R R R R C 4 R R R R R R R R R R R NR 5 R R C R R R C R R R R R R R R R R R R R R R R C NR R R R Bis A Type R R C R R R R R R NR R R R R R R R R R R Bis A Type R R R R R R, recommended; C, conditional; NR, not recommended. 1 = furan; 2 = epoxy; 3 = polyester; 4 = vinyl ester; 5 = urethane. Carbon filled materials and/or final application with synthetic fabrics. a b 765

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