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PART 2--PRODUCTS <br /> 2.1 MANUFACTURERS <br /> A. Tremco,Inc. <br /> B. Sonnebom <br /> C. Pecora <br /> D. Sika Corporation <br /> E. Dow Corning <br /> 2.2 SEALANTS <br /> A. One-Component Acrylic Sealant: <br /> 1. Acrylic emulsion sealant,one-part,mildew resistant and paintable,complying with ASTM C834, <br /> recommended by manufacturer for general use as an exposed building construction sealant,Pecora <br /> AC-20 or approved substitute. <br /> B. Interior Silicone Rubber Sealant: <br /> 1. Silicone rubber-based,one-part elastomeric sealant,complying with ASTM C920,Type S, <br /> Class 25,Grade NS. <br /> 2. Use acid-type for non-porous joint surfaces,and non-acid type where one or both joint surfaces are <br /> porous. <br /> 3. For wet areas use type compounded specifically for mildew resistance. <br /> 4. Use for interior joints between equipment or counters and walls. <br /> C. Two-Component Polyurethane Sealant: <br /> 1. Polyurethane-based,2-part elastomeric sealant,complying with ASTM C920,Type M,Class 25, <br /> Grade NS(non-sag),Tremco"Dymeric",Pecora"Dynatrol II". <br /> 2. Optional Sealant:Contractor may,at his option,provide 1-Component Silicone Sealant,"Silpruf' <br /> by General Electric or#790 by Dow-Corning in lieu of above. <br /> 3. For exterior and interior walks,exterior wall joints and floor joints,polyurethane as above except <br /> Grade P(self-leveling),Tremco"Dymeric",Pecora"Urexpan NR-200". <br /> D. Backer Rod:Compressible,closed cell non-gassing type compatible with required sealant. <br /> PART 3—EXECUTION <br /> 3.1 INSTALLATION <br /> A. Joints: <br /> 1. Install sealants to depths as recommended by the sealant manufacturer but within the following <br /> general limitations,measured at the center(thin)section of the bead: <br /> (a) For walks,sidewalks,pavements and similar joints sealed with elastomeric sealants and <br /> subject to traffic and other abrasion and indentation exposures,fill joints to a depth equal to <br /> 75%of joint width,but neither more than 0.625"deep nor less than 0.375"deep. <br /> (b) For normal moving joints sealed with elastomeric sealants,but not subject to traffic,fill joints <br /> to a depth equal to 50%of joint width,but neither more than 0.5"deep nor less than 0.25" <br /> deep. <br /> C13.108617-Orono,MN CAULKING AND SEALANTS <br /> Water Treatment System Improvements PAGE 07900-2 <br />