Knowde Enhanced TDS
Identification & Functionality
- Chemical Family
- Technologies
- Product Families
Features & Benefits
- Ready-to-Use Product Features
- Features
- Single component application, vulcanized by moisture Non-yellowing with excellent weathering properties
- Excellent water resistance
- Good chemical resistance
- Rapid cure at room temperatures and can be accelerated for low temperature or low humidity
- Cure High hiding with one coat application
- Benefits
- Easy application, by squeegee, roller or low pressure airless spray
- Superior water resistance
- Excellent weathering properties
- Rapid cure at room temperatures as well as lower temperature or lower humidity conditions
- High hiding with one coat application
- Color stable aliphatic polyurea-ester-urethane backbone
- High tensile strength
- High abrasion resistance
- Product Highlights
Basic Uses: UREA-TUFF 4290 is an abrasion-resistant and weather resistant Top Coat designed for use in TUFFLEX Traffic Bearing and Roof Coating Systems where there is a requirement for a low VOC and fast curing top coat. UREA-TUFF 4290 is used where optimum weather resistance, abrasion resistance and color stability are required. It is typically used in conjunction with the UREA-TUFF 4260 & 4270 series Polyurea membranes. The cured UREA-TUFF 4290 top coat easily withstands the extreme environmental conditions encountered in exterior construction environments. When used in conjunction with elastomeric base membranes, the UREA-TUFF 4290 composite systems are designed to handle the substrate expansion and contraction which is typical during low temperature to high temperature thermal cycling. UREA-TUFF 4290 may also be used alone as an abrasionresisting maintenance coating.
Applications & Uses
- Applications
- Application Area
- Cure Method
- Installation
Surface Preparation: All surfaces to be coated with UREA-TUFF 4290 must be thoroughly dry and free of all contaminants, including oxidation on old top coats or base coats as well as construction debris or deposits.
Application: Always stir the pigmented Part A thoroughly prior to use. UREA-TUFF 4290 is normally applied at a rate of 100-133 square feet per gallon, per coat, resulting in a wet film thickness of 12 to 16 wet mils. Coverage will vary depending on the texture, aggregate size or degree of surface porosity. The larger the aggregate used, the lower will be the coverage due to the larger surface area of the aggregate. UREA-TUFF 4290 is easily applied by squeegee, roller, or notched trowel. Always follow by backrolling. At 50% relative humidity and 77°F, the coating will reach an initial set within 2 hours. Light traffic should not be allowed on the finished coating for 3-4 hours.
- Maintenance
If a UREA-TUFF 4290 coated surface is damaged, it can be repaired by light sanding or by scrubbing with a solution of TSP and water, followed by a thorough rinse with water. Allow to dry. Follow this with a solvent wipe with xylene or acetone mixed with TUFFLEX-7113 penetrating cleaning additive. When the surface is dry, apply additional UREA-TUFF 4290.
Properties
- Physical Form
- Polymer Composition
- Aliphatic Polyester Polyurethane
- Technical Data
| Value | Units | Test Method / Conditions | |
| Solid Content (By Weight) | 78 - 82 | % | ASTM D-1353 |
| VOC Content (Mixed Material) | max. 100 | g/l | — |
| Tack-Free Time (77°F, 50% R.H.,12 mils) | 2.0 | h | — |
| Flash Point (Mixed Material) | min. 116 | °F | ASTM D-93 |
| Tensile Strength | 3350 - 4110 | psi | ASTM D-412 |
| Ultimate Elongation | 125 - 225 | % | ASTM D-412 |
| Hardness | 85 - 95 | Shore A | ASTM D-2240 |
| Adhesion to Base Membrane | 30.0 | pli | — |
| Moisture Vapor Transmission (20 mils) | 0.1 | perms | ASTM E-96 |
| Abrasion Resistance (Inch Loss) | max. 0.001 | — | C-502 Tabor Abrasion, 1000 Rev, 1000 Gm. Weight, CS-17 Wheel |
| Tear Strength | 300 - 400 | lb./in. | ASTM D-1004 |
| Chemical Resistance (Commonly Encountered Acids, Salts, and Oils) | Excellent | — | ASTM D-2299 |
| Weathering Resistance (2000 Hours) | No Chalking | — | ASTM G-23 |
| Service Temperature Range | -30 to 200 | °F | — |
| Weight | 10.4 - 10.8 | lbs./gal | ASTM D-1475 |
Safety & Health
- Precautions
This product contains aliphatic isocyanates, low viscosity amine chain extenders and petroleum hydrocarbon solvents. Read the containerprecautionary labels and Safety Data Sheet (SDS) carefully. Exposure to urethanes and petroleum solvents may cause allergic skin and respiratory reaction. Personnel applying coatings containing petroleum solvents and 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 of Part A (base resin) that have been opened must be used within 7 days, since the product is a moisture-reactive material that will set up when exposed to moisture in the air. Keep lid tightly sealed when material is not in use.
- Shelf Life
Twelve (12) months after manufacture when continuously stored indoors in unopened metal pails at temperatures under 80°F. Stir thoroughly prior to use.