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Technical Data Sheet (TDS)

WFR-930 Solva-Mastic®

Alcohol-Based Wood Flooring Adhesive

Special features

  • Superior "Green Grab" unmatched by any other adhesive
  • Contains no chlorinated solvents
  • Eliminates hollow spots under wood flooring
  • Easily spread and cleaned
  • U.S. Patent 7,179,088 B2

Product Description
STAUF WFR-930 Solva-Mastic is an alcohol based, high-strength adhesive for professional timber flooring installation. It contains no chlorinated solvents or other materials harmful to one's health. It is ozone and environmentally safe.
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 beginning 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 starting, 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.
Moisture content in concrete sub floors must be below 3#/24h/1,000 sq. ft. using the Calcium Chloride Test or less than 75% using the relative humidity test.

All timber floors should have 8-14% moisture content at installation. There should be no more than a 4-5% variance in moisture content between the timber flooring and any timber sub floor. See NWFA guidelines and the timber flooring manufacturer's recommendations for details.
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 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.
Place lid on pail tightly. Store pail in cool dry place. Observe official regulations on storage and handling of flammable liquids red label). DOT Class 3 Hazmat UN 1133 Adhesives

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.
Observe mandatory regulations concerning installations where flammable liquids are used.

This adhesive will not prevent moisture-related damages to timber flooring.
Do not install solid timber below grade. Do not use on concrete with curing agents or sealers except approved Sealers listed below. Do not use on damp sub floors. Do not install timber flooring with a moisture reading above 14%. Do not use adhesive as a leveling material.
In case of accident, injury, spill or exposure, see MSDS sheet for information. Consult technical data sheet at for updated information.
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 Adhesive LLC, will in no event be liable for any incidental and/or consequential damages. Therefore, 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
  • contains no isocyanates
  • contains no water
  • contains no chlorinated solvents
  • flammable
  • ozone friendly
  • alcohol quality for professionals
  • Freeze/thaw stable
Installation Features
  • wet lay - no flash time required
  • superior green grab
  • non-slump formula
  • bridges normal sub floor variations
  • eliminates hollow spots
  • pleasant odour
  • cleans with acetone
  • no rolling required
  • high spread rate
  • spreads easily
  • dries quickly
Long Term Features
  • resistant against aging
  • remains elastic
  • suitable for radiant heat systems with primer
Approved Timber Flooring
  • Engineered Timber Flooring
  • Parquet
  • Bamboo NOT approved
Approved Sub Floors
  • Concrete Slabs
  • OSB (underlayment grade)
  • plywood (underlayment grade)
  • cured levelling compounds
  • radiant heated sub floors
Approved Primers
  • Primer is normally not required
  • STAUF SOP-230 Solva-Prime
Approved Sealers
  • STAUF ACS-210 True-Seal
Approved Leveling Compounds
  • STAUF SLC-540 Self Leveling Compound
  • STAUF QFF-560 Quick Feather Float
Approved Trowels and Spread Rate
  • Trowel #5 (Engineered): up to 1.5 m/L
  • Trowel #3 (Parquet Wood Floors): up to 1.72 m/L
  • Trowel #15 (Underlayments): up to 2.5 m/L
Cure Time until Normal Traffic
  • between 48 and 72 hours
  • Use acetone while wet or dried
  • Will not etch floor finish
Temperature Range during Installation
  • 10-30 C
Relative Humidity Range during Installation
  • 30% - 80%
Packaging Size
  • 4 gal. (15.14 L) Metal Pail
  • 36 per pallet
  • Beige
VOC (calculated) [g/L]
  • 90
Flash Point [°F]
  • 28
pH value of concrete
  • must be below 12.4
  • UN 1133 Adhesive DOT Class 3 Flammable Liquid
  • obey local storage regulations for flammable liquids
Shelf Life
  • 24 Months in original, unopened container
Shear Strength
  • 682 psi (4.7 N/mm²)
Open Time30% R/H50% R/H80% R/H
50�F/10�C25 min 35 min. 40 min. 
70�F/21�C23 min. 30 min. 35 min. 
90�F/32�C20 min. 25 min. 30 min. 
Revision: 2022-04-22 11:31:25

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