Specifications include, but are not limited to: A. Resin: 1. Resin System: Premium corrosion-resistant, fire-retardant vinylester, or other qualified thermosetting resin. Resin to be selected by fabricator, subject to approval of Engineer, and suitable for intended service with no fillers or thixotropic agents. 2. Liner Resin: Premium grade and corrosion resistant. 3. Structural wall resin may be of different chemical resistance, subject to conditions of service and approval of Engineer. 4. Flame Spread Index: ASTM E84, less than 25; fire retardant additives used only in structural layer. 5. Structural wall resin shall contain a minimum of 3 percent antimony trioxide to achieve required flame spread index. 6. Add ultraviolet absorbers to surfacing resin to improve weather resistance. 7. Color: Use no dyes, pigments, or colorants, except in exterior gel coat. Exterior gel coat shall be white. 8. For interior duct, final coat shall be factory applied intumescent coating to achieve designated results for low smoke development. B. Reinforcement: 1. Veil: Chemical surfacing mat, Type C (chemical) glass, 10 mils thick, with finish and binder compatible with lay-up resin. 2. Corrosion Barrier: Resin-rich interior surface of nominal 100 milsto 120 mils thick, using chopped strand mat backing the veil. Use no additive in corrosion barrier. 3. Chopped Strand Mat: Type E glass, minimum 1-1/2 ounces per square foot, with silane finish and styrene soluble binder. 4. Continuous Roving for Chopper Gun Spray-Up: Type E glass. 5. Woven Roving: Type E glass, nominal 24 ounces per square yard, 4 by 5 weave, with silane type finish. 6. Continuous Roving for Filament Winding: Type E glass with silane type finish. C. Fasteners: 1. Bolts: ASTM A193/A193M, Type 316 stainless steel, ANSI coarse thread series, Grade B 8M hex head. 2. Nuts: ASTM A194/A194M, Type 316 stainless steel, Grade 8M. 3. Washers: ASME B18.22.1, flat, Type 316 stainless steel.
