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Technical Data Sheet (TDS)

CTS-837 VCT Clear Thin Spread

Ultra Premium Clear Thin Spread Adhesive

Special features

  • High performance formula for installing vinyl composition tile, VCT
  • Fast tack and high shear strength to prevent tile slippage
  • 24 hour working time
  • Superior moisture resistance
  • Excellent final bond
  • Can be used over cutback adhesive residue
  • Chalk lines can be seen through adhesive

Product Description
CTS-837 has been formulated to ensure superior adhesive performance under the very
demanding conditions commonly found in today?s fast paced construction and raises the bar for the
performance of clear thin spread adhesives. This acrylic enhanced formula means that contractors may install vinyl
composition (VCT) and asphalt tile over concrete subfloors with elevated moisture emissions and in situ relative
humidity levels. The CRI Green-label Plus Adhesive Certification Program has certified CTS-837 as a ?low VOC?
CTS-837 is a ultra premium, professional adhesive that dries quickly and has a long lasting grab
for the installation of vinyl composition tile (VCT), asphalt tile, and AAT approved carpet cushions
(urethanes, synthetic fiber, rubber sponge). This acrylic enhanced adhesive dries to a transparent
film allowing lay-out lines to remain visible. CTS-837 is ?installer friendly? and ?solvent free.?
CTS-837 spreads easily, has an extended working time, is outstandingly water resistant, and
nonflammable. Like all of our adhesives, this adhesive is protected by the CleanGuard® two-stage
antimicrobial. CleanGuard® is a specifically formulated broad-spectrum, anti-microbial agent that
protects our adhesives and sealers from microorganisms, such as mold or mildew, in both the wet and dry state.
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 applicable 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.
Moisture content in concrete sub floors must be below 8#/24hrs/1,000 sq. ft. using the Calcium Chloride Test or less than 95% RH using the in-situ test per ASTM F1869 and F2170.
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 contaminants 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, gypcrete, wooden sub floors, levelers, patches and light weight concrete must be primed. Fast curing cementitious leveling or patching compounds might reduce the flash and work time of water based products due to absorption.
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. Observe the appropriate flash time (if applicable). Lay the flooring into the adhesive, correctly position it and press down firmly. Be sure to check the back of the flooring to make certain good adhesive transfer from sub floor to flooring is achieved. Roll flooring approx. 15-30 min after installation with a 75-100# roller if recommended by the flooring manufacturer. Push down raised edges approx. 30-60 min after installation.
Store and transport protected from freezing. Recommended minimum temperatures are 35 °F for transport and 40 °F for storage. Do not stir product if frozen, allow to thaw completely.
When using other than STAUF products in conjunction with STAUF primers, sealers, leveling compounds, or adhesives, STAUF denies any and all responsibility for any ensuing problems and/or damages without prior written authorization from STAUF.
In case of accident, injury, spill or exposure, see SDS sheet for information. Consult technical data sheet at for updated information.
This adhesive will maintain its integrity and performance even when higher levels of moisture are present. While adhesive can withstand up to 8#/24 hrs/1,000 SF (Calcium Chloride Test) and 95% RH (in-situ probe) of moisture, it does not qualify as a moisture inhibitor. Please see below for recommended sealers if a moisture barrier is required. Not suitable for areas with excessive topical moisture (i.e. melting snow, repeated flooding, pressure washing) or extreme horizontal shear forces; use R-Series adhesives under these circumstances.
The foregoing representations are based on the results of our most current product and material testing within a controlled environment and are of a non-obligatory advisory nature only. As such, they do not constitute an express or implied warranty of any kind including the Warranty of Merchantability and/or Fitness for a Particular Purpose. Because we have no control over the actual quality of workmanship, materials used and worksite conditions, STAUF USA, LLC. will in no event be liable for any incidental and/or consequential damages. herefore, we strongly recommend that prior on-site testing be conducted to refer to and study the suitability of the product for the intended purpose. With the release of this technical information sheet all its prior versions become invalid. For warranty and warranty disclaimer information please see our Limited Lifetime Warranty @
General Features
  • LEED qualified
  • dries in less than 2 hours
  • contains no VOC (calc. per CA Rule 1168)
  • nonflammable
  • dispersion base cleans with water
  • certified "green", CRI GLP
Installation Features
  • grabs quicker, less slippage
  • very low odor
  • cleans with warm water and soap
  • high spread rate
  • long open time
  • spreads easily
  • dries quickly
  • higher temp will shorten drying time
Long Term Features
  • resistant against aging
  • remains elastic
Approved Flooring
  • VCT (Vinyl Composition Tiles)
Approved Sub Floors
  • Concrete Slabs
  • OSB (underlayment grade)
  • Plywood (underlayment grade)
  • Cured Leveling Compounds
  • Radiant Heated Sub Floors
Flash Time (dry lay)
  • 30 - 60 min
Open Time (dry lay)
  • up to 24 hrs
Approved Primers
  • Primer is normally not required
  • STAUF AQP-200 Eco-Prime
Approved Sealers
  • STAUF ACS-210 True-Seal
Approved Leveling Compounds
  • STAUF SLC-540 Self Leveling Compound
  • STAUF QFF-560 Quick Feather Float
  • STAUF RLC-580 Fiber Level
Approved Trowels and Spread Rate
  • VCT, asphalt tile over porous-#9 (1/32"x1/16"x1/32" U notch): up to 250 SF/gal.
  • VCT, asphalt tile over non-porous-#13 (1/32"x1/32"x1/32" └┘ notch): up to 350 SF/gal.
  • Carpet cushion-#8 (1/16"x1/16"x1/16" └┘ notch): up to 150 SF/gal.
Cure Time until Normal Traffic
  • approx. 24 hours
  • Use soap and water
Temperature Range during Installation
  • 50-90F
Relative Humidity Range during Installation
  • 30% - 80%
Packaging Size
  • 4 gal. Plastic Pail
  • 48 per pallet
  • Case of 4x1 gal Plastic Pails
  • 42 per pallet
  • Cream
pH value of concrete
  • must be between 7 and 9
  • above 35F (do not stir if frozen, allow to thaw completely)
  • above 40 F, protect from freezing
Shelf Life
  • 12 Months in original, unopened container
Revision: 2017-07-24 11:52:36

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