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Table I. Typical Physical Properties of Polymer Concretes Property Test Method Tensile strength, psi (MPa) Compressive strength, psi (MPa) Flexural strength, psi (MPa) Linear shrinkage, % Density, lb/ft3 Water absorption, % Maximum use temperature, O Continuous Intermittent Thickness, in. (mm) F(O C) — — — 150 (66) 200 (93) 0.5 (13) The chemical resistance of polymer concretes is similar to their synthetic resin lining system counterparts as indicated in Table VII. LININGS There are a host of lining materials available for protecting concrete and steel. The three basic types are glass-fiber-reinforced sheet and molten asphaltics; sheet rub- ber, plastics, and elastomers; and reinforced and nonreinforced ambient-cured syn- thetic resin systems. Conspicuous by its absence from this list is protective coatings. This is not to say they can't be used; however, 60 mils is usually considered to be a mini- mum acceptable thickness for a material to be considered a tank lining. If a coat- ing can be economically applied (initial cost and longevity) to a minimum thickness of 60 mils, free of pinholes and holidays, and can resist the process chemicals and temperatures as well as physical abuse, consideration should be given to their use. Generally speaking, coatings are used for fume and splash protec- tion and not necessarily for total immersion process applications. Asphaltic linings are equally appro- Long Life for New Tanks CHOOSE FLEXI-LINERTM New Life for Old Tanks priate for application to concrete and steel. The hot-applied, molten materials, as well as sheet stock can be used on concrete tanks. For steel tanks, glass-fiber-reinforced sheet is the most desirable. Both types of asphaltic linings, sheet and molten, are seldom, if ever, used without being further protected with a chem- ical-resistant brick lining. Without further protection from a brick sheathing, these linings can cold flow and be easily damaged from impact, abrasion, and thermal excur- sions. Masonry sheathings provide a rugged, chemical-resistant insulating barrier for protection of asphaltic • The original flexible tank liner • Installed worldwide • Custom fabricated to ensure fit • Advanced & proven material formulations • Resistant to a wide range of chemicals • Always responsive to emergencies Since 1953 Flexible • Corrosion-resistant Easy to install [ Call today 800-423-4909 FLEXI-LINER Email: info@flexi-liner.com ] "Trusted by Fortune 500 and owner-operators alike" 3198 Factory Drive Pomona, CA 91768 800-356-4648 www.flexi-liner.com www.metalfinishing.com/advertisers 625 ASTM C 307 ASTM C 039 ASTM C 580 ASTM C 531 ASTM D 792 ASTM C 413 Typical Value 1,000-2,000 (7-14) 10,000-12,000 (70-82) 2,000-4,000 (14-28) < 0.1 130-145 (2.1-2.3) < 0.1