Knowde Enhanced TDS
Identification & Functionality
- Chemical Family
- Product Type
- Technologies
Features & Benefits
- Labeling Claims
- Ready-to-Use Product Features
- Features
UREA-TUFF 4260 has good chemical and water resistance and is often suitable for use in waterproofing assemblies designed for water immersion conditions (with appropriate geotextile reinforcement and cement mortar top coat). The cured membrane possesses the necessary elongation and tensile strength to span hairline substrate cracks.
- Benefits
- Solvent free
- Non-gassing easy application by squeegee, trowel or roller
- Resilient to expansion and contraction of substrate high adhesion
- Stress-relieving
- Crack bridging membrane provides 100% contact
- Eliminates migratory water problems designed for demanding exterior applications
Applications & Uses
- Markets
- Applications
- Application Area
- Basic Uses
UREA-TUFF 4260 is designed for use as a high mil thickness, liquid-applied, high solids elastomeric waterproofing membrane for concrete, plywood, or metallic substrates.
- Suggested Application
- Base Coat on vehicular decks, pedestrian walkways, patios and helipads
- High performance between slab waterproofing system for parking decks or roof decks
- Waterproofing under kitchen, laundry, bathroom floors and shower pans
- Used as a higher hardness sealant or bedding compound in a multitude of applications
- Waterproofing inside planter boxes and as a geotextile fabric reinforced buried membrane for reflective pools
- Waterproofing under tile, terrazzo or wood floors
- Waterproofing protection for subgrade structures and tunnels
- Secondary containment buried membrane around storage tanks when used with epoxy top coats
- Installation
Surface Preparation: All surfaces to be coated with UREA-TUFF 4260 must be free of all contamination including oil, grease, concrete curing compounds, paint and dirt. New concrete surfaces should be shotblasted, sanded or mechanically scarified to remove laitance and impurities. (High Pressure-wash with water or power vacuum in order to remove all cleaning contaminants). New concrete should be cured for a minimum of 28 days and should have a minimum of 3000 psi compressive strength. The only permissible concrete curing agents (if used) are of the pure sodium silicate type. Other proposed curing agents will require the prior written approval of TUFFLEX.
Priming: Most application conditions require priming. Use TUFF-POXY Primer # 1 (solvent free) or TUFF-POXY Primer # 3 (low VOC) epoxy primers. Allow the primer to properly cure to a firm but tacky condition prior to application of the UREA-TUFF 4260 membrane system. Apply the primers at the rate of 250-350 square feet per mixed gallon and apply properly sized bonding aggregate when needed.
- Application
- Thorough mixing of Part A with Part B is critical to successful application and should be performed with a slow speed power mixer such as a model KOL mixer with a ½ h.p. motor at 60 rpm or equivalent mixer equipped with a “Jiffy” type mixing blade. Do not mix at high speeds or use an air-entraining paddle mixer.
- The mixed material has an approximate pot life of 25 to 35 minutes at 77°F; higher temperatures will shorten the pot life.
- Hand mix or machine mix Part A for 2 minutes in its separate container. Pour all of Part B into the container of Part A and mix 1-2 minutes, taking care that the sides and bottom of the mixing pail are scraped with a broad blade spatula.
- After mixing, apply the material as desired. It may be applied by notched squeegee, notched trowel or heavy duty roller.
- The thickness of the applied membrane will vary with specific use requirements. However, an average thickness of 32-64 mils is recommended. Four gallons of the mixed material applied at a thickness of 64 mils should cover an area of 100 square feet (with no allowance for loss or wastage).
- Application should not commence unless the ambient temperature is 45°F or higher and should not proceed during inclement weather.
- UREA-TUFF 4260 may also be spray applied followed by backrolling using appropriate two-component urethane dispensing equipment.
- UREA-TUFF 4260 will attain its initial set within 3 to 4 hours however it will remain slightly tacky to the touch.
- If multiple coats of UREA-TUFF 4260 are desired and if the first coat is dirty or lost its surface tack, solvent wiping is recommended to remove dirt or contamination prior to additional applications Do not use lacquer thinner but an approved urethane-grade solvent such as xylene or acetone. Do not puddle cleaning solvents. Allow the solvent to fully evaporate prior to applying additional coats. Allow the application of UREA-TUFF 4260 to cure for at least 4 hours, and until firm, before recoating with additional materials.
- Maintenance
If UREA-TUFF 4260 membrane is damaged prior to the placing of the top coat or protective layer, it can be repaired by abrading the surface, wiping with xylene or acetone solvent and recoating with properly mixed UREATUFF 4260.
Properties
- Pot Life (77°F)
- 20 - 25 Minutes
- Physical Properties
| Value | Units | Test Method / Conditions | |
| Weight (Hardener) | 8.3 | lbs./gal | — |
| Weight (Resin) | 9.4 | lbs./gal | — |
| Solvent Content | Solvent Free | — | — |
| Coverage ( 60 mils Thickness) | 25.0 | — | — |
| Hardness | 60 - 66 | Shore A | ASTM D-2240 |
| Tensile Strength | 1400 - 1800 | psi | ASTM D-412 |
| Ultimate Elongation | 550 - 750 | % | ASTM D-412 |
| Tear Resistance | 200 - 250 | pli | ASTM D-1004 |
| Gel Time (77°F) | 35 - 40 Minutes | — | — |
| Low Temperature (Brittleness, -30°F) | Pass | — | ASTM D-746 |
| Flash Point (Mixed Material) | min. 200 | °F | ASTM D-3278 |
Safety & Health
- Precautions
This product contains isocyanates and low viscosity amine chain extenders. Read the container-warning labels carefully. Exposure to Isocyanates may cause allergic skin and respiratory reaction. Personnel applying isocyanate prepolymers should wear protective clothing, goggles and gloves and should use only with adequate ventilation and respiratory protective gear. Avoid contact of material with skin or eyes and avoid breathing vapors. Mix and apply only in well-ventilated areas.
Storage & Handling
- Limitations
Containers that have been opened should be used within several days. Opened pails should be purged with nitrogen prior to resealing lids. UREA-TUFF 4260 is not intended for long term exterior exposure without application of a suitable topping or protective layer. When used in an exposed membrane system, an approved TUFFLEX Aliphatic Polyurea top coat should be applied to prevent UV discoloration.
- Shelf Life
Nine (9) months when continuously stored in the original metal pails at a temperature less than 80°F. Six (6) months in plastic pails.