Solvent Free


Rapid Curing

Easy Application by Squeegee


UREA-TUFF 4270 is a two-component, liquid-applied, medium hardness, hybrid polyurea elastomer designed for use as a mix-in-the-bucket, but yet rapid-curing, monolithic waterproofing membrane.


Composition: UREA-TUFF 4270 is a solvent-free, two-component, liquid-applied, aromatic polyurea-polyurethane elastomer containing no tar or asphaltic extenders.


Basic Uses: UREA-TUFF 4270 is designed for use as a high mil thickness, liquid-applied, high solids elastomeric waterproofing membrane for concrete, plywood, or metallic substrates.


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 4270 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.


Surface Preparation: All surfaces to be coated with  UREA-TUFF 4270 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 4270 membrane system. Apply the primers at the rate of 250-350 square feet per mixed gallon and apply bonding aggregate when needed.


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. Read the appropriate Safety Data Sheet (SDS) prior to handling the epoxy primers or the UREA-TUFF 4270 Membrane. THIS PRODUCT IS FOR PROFESSIONAL USE ONLY.


If UREA-TUFF 4270 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 UREA-TUFF 4270.


TUFFLEX POLYMERS (TUFFLEX) warrants this product to be free of defects in workmanship and materials only at the time of shipment from our factory. If any TUFFLEX materials prove to contain manufacturing defects that substantially affect their performance, TUFFLEX will, at its option, replace the materials or refund its purchase price.


This limited warranty is the only warranty extended by TUFFLEX with respect to its materials. There are no other warranties, including the implied warranties of merchantability and fitness for a particular purpose. TUFFLEX specifically disclaims liability for any incidental, consequential, or other damages, including but not limited to, loss of profits or damages to a structure or its contents, arising under any theory of law whatsoever.


The dollar value of TUFFLEX’s liability and buyer’s remedy under this limited warranty shall not exceed the purchase price of the TUFFLEX material in question.


10880 Poplar Avenue

Fontana, California 92337


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