Knowde Enhanced TDS
Identification & Functionality
- Chemical Family
- Product Type
- Technologies
Features & Benefits
- Labeling Claims
- Ready-to-Use Product Features
- Attributes
- Contains No Water
- Wet-Set Tack
- Excellent Green Gra
- Freeze-Thaw Stable
- Controls MVER up to 15 lbs./85% RH
- Easy to Clean When Wet or Dry
- One-Day, One-Step System
- Helps Contribute to LEED Credits
- General Characteristics
Dritac 7900 has been formulated for the interior installation of multi-ply engineered plank, solid plank, bamboo, exotic wood, acrylic impregnated wood, parquet, plywood, recycled rubber flooring and cork/rubber/foam underlayments over approved substrates. Carefully follow the flooring manufacturer’s instructions. The time it takes for the adhesive to cure is related to temperature, humidity, porosity of the subfloor, ventilation and air movement.
Applications & Uses
- Applications
- Application Area
- Compatible Substrates & Surfaces
- Cure Method
- Flooring Types
- Parquet
- Cork/Rubber/Foam Underlayment
- Plywood
- Exotic Multi-Ply Engineered Plank
- Solid Wood Planks
- Acrylic Impregnated Wood
- Recycled Rubber Flooring
- Bamboo
- Approved Subfloors
- Plywood
- Terrazzo and ceramic tile
- Underlayment grade O.S.B.
- Vinyl tile flooring coated with vinyl primer
- Concrete; above, on or below grade in the absence of excessive moisture and alkalinity
- Non-cushioned fully adhered sheet vinyl coated with vinyl primer
- Lightweight concrete/gypcrete (coated with latex primer), per ASTM F2419
Note: If DriTac’s list of approved subfloors is different from the flooring manufacturer, DriTac requires that you must follow the flooring manufacturer’s recommendation.
Applies for 3-in-1 System Only:
- Concrete; above or on-grade and below-grade only in the absence of excessive moisture/alkalinity
- Light weight concretes (coated with latex primer)
- Gypcrete (Above-grade when coated with an approved latex primer)
- Subfloor Requirements
- Clean - It is required that all concrete, sheet vinyl, vinyl tile, terrazzo and ceramic tile subfloors be scoured with #3-1/2 open coat sandpaper to remove dirt or any surface contamination such as paint, grease, oil, sealers, waxes and curing compounds. Dritac 7900 adhesive should not be used over these substances. Sweep or vacuum the subfloor before installation.
- Preparation - All floors should be flat to within 3/16” in 10 ft. or 1/8” in 6 ft.
- Smooth and Flat - Remove any high spots with a terrazzo grinder or Carborundum stone and fill any low spots with a good quality cementitious-based latex patch mix.
- Concrete Subfloors
Concrete should be at least 60 days old. Inspect the concrete before installing flooring over it. First inspect for any wetness at the base of the drywall or for visible signs of moisture on the concrete. Second, test for moisture. Use a Calcium Chloride Method Test or Relative Humidity Test for reliable concrete testing. The results should not exceed 3 lbs., per 1,000 square feet over 24 hours, per the ASTM F1869 Calcium Chloride Method Test, or 75% Relative Humidity (RH), per the ASTM F2170 Relative Humidity Method Test. The maximum reading on concrete for wood installations should not exceed the wood flooring manufacturer’s recommendations. Many wood flooring products can be installed over lightweight concrete (less then 3000 PSI) or gypcrete, providing the surface is properly prepared. Follow the concrete manufacturer’s recommendation for the application of a surface hardener/sealer. Radiant heated subfloors should be turned off 24 hours prior to and during installation to prevent premature curing of the adhesive.
- Wood Installations
Applies for Adhesive Bond Only & 5-in-1 System: Provide adequate ventilation and air movement. Ideally, installation should not begin until all wet work (painting, dry wall materials, etc.) is complete and the heating/air conditioning system is in operation. Jobsite temperature should be between 55 and 90º Fahrenheit. Trowel only the amount of adhesive that can be covered in 30 minutes. Install wood flooring into wet adhesive only. Secure the first row with edge blocking or top nail with finishing or sprig nails. Tighten side and end joints and reduce scooting by securing the flooring together with painters tape (Check with wood manufacturer for list of approved tape manufacturers). Occasionally check for transfer to back of wood flooring. If adhesive transfer is less than 90% to the back of the plank scrape up the adhesive and apply fresh Dritac 7900. When using this product as a 5-In-1 system, a monolithic membrane must be formed and adhesive transfer must be 100%. Apply weight to any bowed flooring and all floor mounted trim moldings. Remove all defective or unsightly boards immediately. The adhesive is very tenacious and flooring is difficult to remove after the adhesive has cured. Roll the floor with a 100 lb. roller every two to three hours during and immediately after installation.
- Clean Up
Removing adhesive from the surface of the wood before it cures will help provide an easier installation process. Once Dritac 7900 hardens on the surface of the wood, the adhesive should be cleaned with a dry clean, non-abrasive cloth followed by a light buffing motion with a second clean non-abrasive cloth.
- Limitations
Applies for Adhesive Bond Only & 5-in-1 System: Dritac 7900 adhesive is affected by humidity more than temperature. High humidity will cause the adhesive to cure faster and low humidity will slow the curing process. Do not use on wet, contaminated or friable substrates. Only engineered plank can be installed below grade due to the limitations in solid wood flooring such as lack of dimensional stability. After 8 to 12 hours, light traffic is allowed. Do not use as a leveling material. Do not use with gypsum based patches or underlayments in wet or moist environments. This product requires a cementitous-based patching compound that is approved for use in high moisture applications when installing Dritac 7900 in a wet or moist environment. Dritac 7900 can be applied over old asphalt cutback adhesive residue as long as the adhesive ridges and raised residue have been completely removed from the subfloor with only minor stains remaining.
- Reuse of Partial Containers
Cover adhesive in the pail with a plastic trash bag or two layers of plastic film. Put lid on tightly. Turn over pail. This will seal contents from outside air. To open container, take off lid, cut plastic and remove thin layer of cured adhesive on surface.
Properties
- Physical Form
Safety & Health
- Precautions
- Contains Methylene Diphenyl Diisocyanate. May cause skin and/or eye irritation. May cause dermatitis and allergic responses. Potential skin and/or respiratory sensitizer. Inhalation of vapors may cause irritation and intoxication with headaches, dizziness, and nausea. See Safety Data Sheets for further information. Ingestion may cause irritation.
- KEEP OUT OF REACH OF CHILDREN. Avoid contact with skin, eyes and clothing. Wash thoroughly after handling. Avoid breathing vapors. Use only with adequate ventilation. Use impervious gloves, eye protection and if TLV is exceeded or if used in a poorly ventilated area, use NIOSH/MSMA approved respiratory protection in accordance with applicable federal, state and local regulations. DO NOT take internally. Empty container may contain hazardous residues.
- First Aid
In case of eye contact, flush thoroughly with water for at least 15 minutes. SEEK IMMEDIATE MEDICAL ATTENTION. In case of skin contact, wash affected areas with soap and water. If irritation persists, SEEK MEDICAL ATTENTION. Remove and wash all contaminated clothing. If inhalation causes physical discomfort, remove to fresh air. If discomfort persists, SEEK MEDICAL ATTENTION.
Packaging & Availability
- Packaging Type
- Available Container Size
4-Gallon Pail
- Warranty
This product is warranted to be free of manufacturing defects. If a manufacturing defect is found within one year from the date of purchase, such defective product shall be replaced. No warranty either expressed or implied is made regarding the performance of this product since conditions under which these goods are transported, stored, used or applied are beyond our control. This warranty is made in lieu of all other warranties either expressed or implied and the seller shall not be responsible for consequential, incidental, special or other damages no matter what the cause.
Storage & Handling
- Shelf Life
12 months when stored at 75° F and 50% relative humidity.