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Technical Data Sheet (TDS)

EHS-265 Hydro-Seal

Water-Based Epoxy Primer (Two-Component Pail)

Special features

  • For use under ULC-500 and coatings
  • Superb penetration of subfloors
  • Increases bond of subsequent products

Product Description
STAUF EHS-265 Hydro-Seal is a two-component, hybrid-epoxy resin-based primer for subfloor preparation prior to installation of urethane-based leveling compounds. Unlike water or urethane-based primer, EHS-265 is not affected by elevated subfloor moisture. It will not foam up or get weaker because of water present on the subfloor. It also has a higher penetration of the concrete compared to traditional 100% solid epoxies which creates a stronger bond. It does NOT create a moisture barrier but merely reduces the amount of vapor penetration.
EHS-265 spreads easily and creates a dust-free surface ready for the safe installation of flooring. It increases the bonding of subsequently applied primers, leveling compounds, and/or adhesives.
Pre-Installation Checklist
A successful installation requires proper preparation of the subfloor. Read and understand all applicable guidelines and Technical Data Sheets before installation.
Sub Floor Examination
Do not apply the product to a visibly damp surface. Examine concrete subfloor for color, cleanliness, porosity, and pre-existing residues PRIOR TO installation (for details, see Technical Information #18 @ www.staufusa.com). Concrete subfloors must be checked for contaminants and/or anti-adherents using the STAUF Epoxy Test Kit (for details, see Technical Information #16 @ www.staufusa.com).
Prior to installation, the subfloor must be checked according to applicable installation guidelines. It must be solid, sound, clean, porous, free of chaps, anti-adherents, and resistant to pressure and tension. Confirm sufficient porosity by performing a water drop test according to ASTM F3191-16. Check for missing or compromised vapor barriers and hydrostatic pressure by carrying out RH or CaCl moisture tests following ASTM standards F1869-16 or F2170-19. Results of 99% RH or 25# CaCl could indicate a higher moisture content in the slab than what tests can measure, and there might be hydrostatic pressure and/or a compromised or missing vapor barrier.
Sub Floor Preparation
The condition of the subfloor will determine which type of mechanical treatment is required (e.g. wire brushing, sanding, grinding, or shot blasting). Dust, paint, curing compounds, sealers, residual adhesives, or other surface contaminants MUST be removed and a porous surface achieved by suitable means. The extent of subfloor preparation can only be determined at the site by the installer. Clean the surface with an industrial vacuum cleaner and tack the floor with a damp microfiber mop before application. Do not use sweeping compounds unless they are water-based as most others will contain oil or wax which will act as an anti-adherent and prevent primers, sealers, leveling compounds, coatings, and/or adhesives from bonding to the concrete. Cracks and gaps must be treated prior to application of primers, sealers, leveling compounds, coatings, and/or adhesives (for details see Technical Information #19 @ www.staufusa.com).
Mixing of Components
The lid contains a hardener. Pierce all the way through the plastic disc in the center of the lid and the bottom of the lid using a long screwdriver or similar tool. Let the hardener flow into the lower part of the bucket for one minute. All of the hardener must drain into the pail before mixing Parts A&B. Open the ring, remove the lid, and mix both components with a mixing paddle for at least 3 minutes. Use an electric drill with less than 300 rpm until an even color is reached. Avoid air entrapment by mixing slowly and using an appropriate mixing paddle. Make sure to mix along the wall and bottom of the container as well. The temperature of both components should be at least 50°F before mixing.
Installation Procedure
Mix pail according to mixing instructions. Apply coating undiluted with an approved applicator. Make sure the coating is spread evenly and up to the perimeters. The spread rate is critical for a successful installation. Do not exceed the minimum or maximum coverage.
Storage
Store and transport protected from freezing. Recommended minimum temperatures are 35°F for transport and 40°F for storage. Do not stir the product if frozen, allow it to thaw completely.
Limitations
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.
Do not dilute primer/sealer or mix with other products.
In case of an accident, injury, spill, or exposure, see SDS for information. Consult the Technical Data Sheet at www.staufusa.com for updated information.
Sealer will not prevent moisture damage from hydrostatic pressure, missing or compromised vapor barriers, underground springs, damaged water pipes, sinks, icemakers, faulty plumbing, flooding, etc.
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. 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 @ www.staufusa.com
General Features
  • LEED qualified
  • Works under any type of flooring
  • Contains no isocyanates
  • Contains no chlorinated solvents
  • Contains no solvents
  • Contains no VOC (calc. per CA Rule 1168)
  • High solids content
  • Ozone friendly
  • Freeze/thaw stable
Installation Features
  • Creates dust free surface
  • Very low odor
  • High spread rate
  • Excellent penetration of subfloor
  • Higher temp and RH will shorten drying time
  • Observe pot life during installation
Long Term Features
  • Resistant against aging
  • Suitable for radiant heat systems
Viscosity [cps]
  • 400
Approved Subfloors
  • Concrete Slabs
  • Wet Concrete Slab up to 25#/24hr/1,000SF and 100% RH
Approved Trowels and Spread Rate
  • 3/8 in.Nap Roller: up to 320 SF/gal (5 mil)
Drying Time
  • Approx. 2 hours or until clear
Temperature Range during Installation
  • 50-90F (10-32C)
Relative Humidity Range during Installation
  • 30% - 80%
Packing Size
  • 2-1/2 gal. Metal Combo Pail (A+B)
  • 60 per pallet
  • 0.75 qrt Plastic Jug Part A + 2.25 qrt Plastic Jug Part B
Density [lbs./gal.]
  • 8.9
Color
  • White
Color Hardener
  • White
Mixing Ratio
  • 1 Part A + 3 Parts B by weight
  • 3 Part A + 10 Parts B by volume
Pot Life
  • Approx. 45 min. @ 70F (21C)
pH value of concrete
  • Resistant up to 14
Storage
  • Above 32F, not freeze/thaw stable
Shelf Life
  • 24 Months in original, unopened container
Transportation
  • Above 32F, not freeze/thaw stable
  • UN 3082 ENVIRONMENTALLY HAZARDOUS SUBSTANCE, LIQUID, N.O.S. (Epoxide resin), 9, III
Revision: 2022-04-18 13:59:05

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