TECHNICAL DATA SHEET PUM-950 Power-Mastic® Urethane Based Wood Flooring Adhesive Special features Certified to meet toughest "Green" standards contains no isocyanates to etch finishes or harm installers moisture barrier up to 10# or 88% RH Has higher shear strength than competitors PATENT PENDING

Product Description STAUF PUM-950 Power-Mastic provides a tremendous improvement for urethane adhesives. It is a urethane based, high-strength adhesive for professional wood flooring installation. But unlike other Urethane adhesives, it contains no isocyanates, the primary chemical in other urethane adhesives that will etch fine floor finishes and is a suspected carcinogen. Nor does it contain any solvents or other hazardous materials. It is therefore safe for the ozone and environment. And it is certified to meet some of the toughest "green" product requirements in Europe and the world. It qualifies for LEED credits. Long open time allows for easy installations. Since there is no water or solvent present, it will not cause dimensional changes to wood flooring at installation. And it has twice the shear strength of competitors, so it grabs, holds and keeps wood floors in place. This adhesive is waterproof when fully cured and will not dissolve if it gets wet. However, it will not prevent moisture-related damages to wood flooring. This adhesive has earned the highest GEV-EMICODE EC 1 ranking by the European Association for Control of Emissions for Flooring. See www.emicode.com for information. The adhesive spreads easily and has a non-slump formula that will help insure contact and adhesive transfer because the ridges will bridge normal gaps between the flooring and sub floor. It allows fast installation even with complicated patterns due to its strong green grab. There is no flash time required, so installation can commence immediately. Rolling is neither required nor recommended. It offers superior flexibility and is designed to keep the flooring in place, yet allow for normal movement during seasonal changes to the flooring. Pre-Installation Checklist A successful installation requires proper preparation of the sub floor. Read and understand all applicable guidelines and technical data sheets before installation. Follow industry standards and flooring manufacturer's recommendations for sub floor moisture content, design, layout and application of flooring materials. All slab constructions must meet the specific requirements of the floor covering to be installed. Sub Floor Examination Prior to installation, the sub floor must be checked according to NWFA installation guidelines. It must be solid and sound, flat, permanently dry, clean, free of chaps, indentations and anti-adherents, as well as resistant to pressure and tension. Moisture content of all floors must be measured before installation. All wood floors should have 6-9% moisture content at installation. There should be no more than a 4-5% variance in moisture content between the wood flooring and any wood sub floor. See NWFA guidelines and the wood flooring manufacturer's recommendations for details. Moisture content in concrete sub floors must be below 10#/24h/1,000 sq. ft. using the Calcium Chloride Test or below 88% RH using an in-situ probe. Sub Floor Preparation Depending on type and condition of sub floor, a mechanical treatment (e.g. mechanical brushing, grinding or sanding) may be required. Intensity of such work must be determined at the site by the installer. Dust, paint, residual adhesives or other surface pollution must be removed by suitable means. Cleaning the surface with an industrial vacuum cleaner is recommended. Cracks and gaps must be filled with concrete crack filler unless they are expansion joints. Level when necessary to 3/16 inches within 10 feet. Heated sub floors must be primed. Installation Procedure Spread the adhesive with the appropriate notched trowel. Avoid excessive adhesive thickness by passing the trowel evenly through the adhesive at a 45 degree angle. There is no flash time, so installation should begin immediately. Lay the flooring into the adhesive, correctly position it and press down firmly. Rolling is neither required nor recommended. Be sure to check the boards at regular intervals to make certain good adhesive transfer from floor to flooring is accomplished. Bowed boards or boards over low spots should be weighted down until the adhesive cures. Limitations When using other than Stauf products in combination with Stauf primers, sealers, leveling compounds, or adhesives, we deny any and all responsibility for any ensuing problems and/or damages without prior written permission from Stauf. This adhesive is mold and mildew resistant and waterproof when fully cured and will not dissolve if it gets wet. However, it will not prevent moisture-related damages to wood flooring unless it is used as a moisture barrier within the limitations set forth in the technical data sheet. In case of accident, injury, spill or exposure, see MSDS sheet for information. Consult technical data sheet at www.staufusa.com for updated information. Do not install solid wood below grade. Do not use on concrete with curing agents or sealers. Do not install wood flooring with a moisture reading above 9%. Do not use adhesive as a leveling material.

General Features LEED qualified contains no isocyanates to etch floors's finish contains no water twice the shear strength of competitors contains no solvents contains no VOC certified "green" certified "very low emission" nonflammable high solids content ozone friendly Freeze/thaw stable Installation Features wet lay - no flash time required strong green grab non-slump formula bridges normal sub floor variations very low odor cleans with acetone or mineral spirits no rolling required excellent spread rate long open time spreads easily higher temp & RH will shorten drying time No risk of sensitization Long Term Features resistant against aging remains elastic suitable for radiant heat systems with primer allows normal dimensional changes in wood flooring adhesive is waterproof when cured No health hazards Stronger shear srength reduces cupping moisture barrier up to 10# or 88% RH w/#12 trowel Approved Flooring Engineered Wood Flooring Strip Flooring Shorts Planks Parquet Solid Wood Flooring must be straight and flat Bamboo Flooring (except Stranded Bamboo) Approved Sub Floors Concrete Slabs OSB (underlayment grade) Plywood (underlayment grade) Particle or Chipboard (underlayment grade) Old Floors with adhesive residues, sanded Vinyl, well bonded Ceramic Tiles Stone, Terrazzo Cured Leveling Compounds Radiant Heated Sub Floors Wet Concrete Slab up to 10#/24hrs/1,000SF and 88% RH Approved Primers Primer is normally not required STAUF AQP-200 Eco-Prime Approved Sealers STAUF ACS-210 True-Seal STAUF ERP-270 Perma-Seal Approved Leveling Compounds STAUF FLC-500 Leveling Compound STAUF QFP-520 Quick Floor Patch Approved Trowels and Spread Rate Engineered Floors-#14 (3/16"x1/4"x9/16") up to 85SF/gal (sub floor/flooring gap 1/8" max) Engineered Floors-#5 (3/16"x1/4"x3/8") up to 60 SF/gal. Solid Floors-#4 (1/4"x7/32"x9/32") up to 50 SF/gal. Parquet-#3 (5/32"x1/8"x3/16") up to 70 SF/gal. Moisture Barrier-#12: up to 35 SF/gal. (Must use one per pail) Underlayments-#15 (3/32"x3/32"x3/32") up to 100 SF/gal. Cure Time until Normal Traffic between 24 and 48 hours Clean-Up Use acetone or mineral spirit while wet Use plastic scraper and terry cloth when dry Temperature Range during Installation 50°-90°F Relative Humidity Range during Installation 30% - 80% Packaging Size 3 gal. Plastic Pail Weight [lbs./gal.] 13.7 Color Cream Shear Strength 391 psi (2.7 N/mm²) Water Vapor Permeability [ASTM E-96] 0.16 g / 24h * m² * mmHg 0.16 perms * inches Shelf Life 12 Months in original, unopened container Open Time 30% R/H 50% R/H 80% R/H 50°F/10°C 2 1/2 hours  2 hours  1 1/2 hours  70°F/21°C 1 3/4 hours  1 1/4 hours  1 hour  90°F/32°C 1 hour  50 mins  45 mins  Revision: 2013-02-26 18:38:12