M2A-900 Eco-Mastic

M2A-900 Eco-Mastic, Water Based Wood Flooring Adhesive

M2A-900 Eco-Mastic


EC-1 „Green“ Certificate |  Material Safety Data Sheet (MSDS)

Special features

  • "Greenest" Adhesive Available
  • Grabs quicker, scoots less
  • Greater shear strength
  • "Bound" water reduces expansion, cupping
  • Spreads easily; cleans with water


Product Description

STAUF M2A-900 Eco-Mastic is an improved water based, high-strength adhesive for professional wood flooring installation. Its new formulation grabs more quickly and scoots than competitors. Its unique "bound" water formula reduces expansion and cupping at installation. It does not contain any solvents or other hazardous materials. It is ozone and environmentally safe, and is certified as having "very low emissions". 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 lower water content will cause less dimensional changes in wood flooring than competitor's water-based adhesives.

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.

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.


Sub Floor Preparation

Depending on type and condition of sub floor, a mechanical treatment (e.g. mechanical brushing, grinding or sanding) is 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. We recommend cleaning the surface with an industrial vacuum cleaner. Cracks and gaps must be filled with concrete crack filler CCF-30, 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.


When using other than Stauf products in combination with Stauf sealers, we deny any and all responsibility for any ensuing problems and/or damages without prior written permission from Stauf.
Do not install solid wood 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 wood flooring with a moisture reading above 9%. Do not use adhesive as a leveling material.
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.

In case of accident, injury, spill or exposure, see MSDS sheet for information. Consult technical data sheet at www.staufusa.com for updated information.


General Features
  • contains no isocyanates to etch floors's finish
  • twice the shear strength of competitors
  • "bound" water reduces expansion, cupping
  • contains no solvents
  • contains no VOC
  • certified "green"
  • certified "very low emission"
  • nonflammable
  • ozone friendly
  • PVA-dispersion quality for professionals
  • not freeze/thaw stable


Installation Features
  • grabs quicker, less slippage
  • wet lay - no flash time required
  • superior green grab
  • non-slump formula
  • bridges normal sub floor variations
  • very low odor
  • cleans with warm water and soap
  • no rolling required
  • high spread rate
  • spreads easily
  • No risk of sensitization


Long Term Features
  • resistant against aging
  • suitable for radiant heat systems with primer
  • allows normal dimensional changes in wood flooring
  • Eliminates hollow spots


Approved Flooring
  • Engineered Flooring, 3/8"-3/4", up to 7" wide
  • Strip Flooring, Solid, 1/2", up to 3" wide
  • Strip Flooring, Solid, 3/4", up to 3" wide
  • Solid Shorts, 1/2" - 3/4", any width
  • Solid Planks, 1/2" - 3/4", up to 3" wide
  • Solid Wood Flooring must be straight and flat.


Approved Sub Floors
  • Concrete Slabs
  • OSB (underlayment grade)
  • Plywood (underlayment grade)
  • Particle or Chipboard (underlayment grade)
  • Cured Leveling Compounds
  • Radiant Heated Sub Floors
Approved Primers
  • STAUF AQP-200 Eco-Prime
Approved Sealers
  • STAUF ACS-210 True-Seal
Approved Leveling Compounds
  • STAUF FLC-500 Leveling Compound
  • STAUF QFP-520 Quick Floor Patch
Approved Underlayments
  • STAUF SCU-600 Sound Comfort Underlay
  • STAUF SCU-610 Sound Control Underlay
Approved Trowels and Spread Rate
  • Trowel #5 (Engineered Floors): up to 60 SF/gal.
  • Trowel #4 (Solid Floors): up to 50 SF/gal.
  • Trowel #3 (Parquet Wood Floors): up to 70 SF/gal.
  • Trowel #15 (Underlayments): up to 100 SF/gal.
Cure Time until Normal Traffic
  • between 48 and 72 hours
  • Use water and soap
  • Will not etch floor finish
Temperature Range during Installation
  • 50°-90°F
Relative Humidity Range during Installation
  • 30% - 80%
Packaging Size
  • 3 gal. Plastic Pail
  • 3/4 gal. Plastic Pail
Weight [lbs./gal.]
  • 11.3
  • Beige
Shear Strength
  • 392 psi (2.7 N/mm²)
pH value of concrete
  • must be below 12.4
  • above 32 °F
Shelf Life
  • 12 Months in original, unopened container
  • above 32 °F
Open Time 30% R/H 50% R/H 80% R/H
50°F/10°C 30 min  1 hour  11/2 hours 
70°F/21°C 30 min.  1 hour  11/2 hours 
90°F/32°C 20 min.  40 min.  1 hour 






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