09250

PROFORM® BRAND STA-SMOOTH® HS JOINT COMPOUND

MANUFACTURER • Available in four popular • High-speed mixing or exces- and evenly, and is immedi- º. working-set times to meet sive mixing will shorten the ately ready to receive the National Gypsum Company industry needs: 20, 30, 45 working life of the Sta-Smooth joint compound. Sta-Smooth 2001 Rexford Road and 60 minutes. HS Compound. HS tape is 2" wide and Charlotte, NC 28211 • Packaged in easy-to-carry • Do not add water or remix available in 300' rolls, 12 rolls (704) 365-7300 25-lb. bags. after compound begins to per case. Technical Information: • When a spray texture is spec- thicken and harden. ProForm Joint Tape. This paper 1-800-NATIONAL ified for ceilings, the usual • Storage life in high humidity reinforcing tape conceals and (1-800-628-4662) second coat of compound area is 6 months; other areas reinforces wallboard joints. Buffered edges on both sides Fax: 1-800-FAX NGC1 can be eliminated. This saves up to 12 months maximum. ensure optimum working (1-800-329-6421) valuable time and labor in assembly line operations. COMPOSITION & MATERIALS qualities and bond. Center- Internet Home Page: Contains no . May creasing process allows easy www.nationalgypsum.com • Noncombustible. contain any of the following: folding for corners. Tape is 2 1/16" wide and is available 09250/NGC Buyline: 1100 LIMITATIONS Component CAS No. in 250' rolls (20 per carton) • Bags should be kept closed Quartz 14808-06-7 or 500' rolls (10 per carton). º. DESCRIPTION and as airtight as possible. 12001-26-2 Spray textures. ProForm’s ® ® • Not to be applied over moist ProForm BRAND Sta-Smooth (non-asbestiform) 14807-96-6 Perfect Spray, Perfect Spray II HS Joint Compound is a surfaces or surfaces subject to and Spray Quick textures moisture. Perlite 93763-70-3 high-strength, quick-setting Attapulgite Clay 12174-11-7 produce finishes which create joint compound that develops • Do not mix with any other of Paris 10034-76-1 a variety of patterns and effects high strength within the material. Use only clean, Calcium Carbonate 1317-65-3 as well as impressive, mono- first hour of application, drinkable water. Bentonite Clay 1302-78-9 lithic ceilings. minimizing the potential for • Mixing equipment and tools Polyvinyl Alcohol 25213-24-5 cracks and fractures. One PACKAGING must be thoroughly cleaned Gypsum 10101-41-4 coat of Sta-Smooth HS Joint 25 lb. (11.3 kg) bags between batches. Compound is normally all ACCESSORIES APPLICABLE STANDARDS that’s required when the • Each fresh batch of compound Sta-Smooth HS Tape. Easy to surface is to be spray textured. must be kept free of previous apply, this pressure-sensitive, ASTM C 475 batches; otherwise the working Federal Specification SS-J-570B Spray textures can be sprayed on open mesh, fiberglass rein-

life will be shortened. 09250 the treated joint the moment forcing tape goes on quickly the compound is hard, but not dry. Spraying can begin just 35 to 45 minutes from the (Continued next page) time the compound is mixed. With this system, a 12' by 60' ceiling can be joint treated with Sta-Smooth HS, textured and ready to move in as little Job Name ______as one hour. BASIC USES Contractor ______Date______Sta-Smooth HS Joint Compound was developed by National Gypsum for manufactured Submittal Approvals: (Stamps or Signatures) housing and other applications where speed and strength are critical production factors. For best results, Sta-Smooth HS must be used in combination with reinforcing tapes such as ProForm Sta-Smooth HS Tape and ProForm Joint Tape. For unsprayed ceilings, ProForm Sta-Smooth Lite is recommended as a finishing coat. ADVANTAGES • Sta-Smooth HS Joint Compound develops higher strength on setting and optimal strength on drying, minimizing the potential for cracking. º. TECHNICAL DATA Coverage: 45-55 lbs./1,000 sq. ft. (22-27 kg/100 M2)

º. INSTALLATION APPLICABLE STANDARDS AND REFERENCES ASTM C 840 Gypsum Association GA-216 Gypsum Association GA-214 National Gypsum Co. Gypsum Construction Guide

RECOMMENDATIONS In cold weather (outside tem- perature below 50°F [10°C]), temperatures within the building should be maintained at a minimum 50°F (10°C), both day and night, during joint finishing. Adequate ventilation should be provided to eliminate excess moisture. Apply Sta-Smooth HS Joint Compound at a heavy con- sistency, making sure to completely fill the wallboard joint through the tape. For optimum results, use Sta-Smooth HS Tape or ProForm Joint Tape. As soon as Sta-Smooth HS starts to harden, shave off all trowel, knife, joint marks or excess compound using a 6" finishing knife. Do not wait to smooth out marks and protrusions or the compound will be extremely difficult to sand. If the surface is not to be textured, apply a second, wide coat of ProForm Sta-Smooth Lite Joint Compound. Sta-Smooth Lite is a lightweight setting compound that produces a smooth, easy-to-sand finish. Once the second coat has been applied, feather all edges and finish the surface smooth and level. The wet-sponge sanding method offers excel- lent results, avoids creating dust and can be started as soon as the compound has hardened. DECORATION Sta-Smooth HS Joint Compound is not recommended for direct decoration without first being covered with Sta-Smooth Lite Joint Compound.

110628 Rev. 08/05