Aromatic Urethane 520 is a technologically advanced, high solids, single component, moisture cure polyurethane elastomer coating uniquely formulated for the protection of sprayed-in-place polyurethane foam insulation and traditional roofing substrates, such as EPDM single ply membrane and BUR surfaces. Once cured this liquid applied moisture-curing polymer provides a durable, seamless, flexible, waterproof membrane that resists lateral movement, shear and will allow for normal expansion and contraction. Mil for mil, Urethane 520 provides greater UV protection than similar generic coatings and offers increased resistance to moisture penetration through its lower moisture vapor permeability values. Due to its moisture-cure properties, a longer production window can be achieved during application.
RECOMMENDED USES
Urethane 520 was specifically developed as a protective coating for sprayed-in-place polyurethane foam roofing. With excellent adhesion, Urethane 520 may be used as well for protection of conventional commercial/industrial surfaces such as, but not limited to, EPDM single ply membranes, wood, concrete, masonry, asphalt shingles and most types of metals.
APPLICATION INSTRUCTIONS
Urethane 520 may be applied by medium nap rollers, soft brushes or conventional airless spray equipment. Apply Urethane 520 only to clean, dry, sound surfaces free of loose particles or other foreign matter. Successive and/or top coats MUST be applied to the base or intermediate coats within 48 hours to insure proper adhesion.
Apply Urethane 520 at the rate of 1.25 gallon per 100 sq. ft. per coat. Minimum dry mil thickness shall be 25 mils.
PRODUCT APPLICATION SHOULD BE SUSPENDED IMMEDIATELY AND OUR TECHNICAL SERVICE PERSONNEL CONTACTED IF THE RESULTS BEING OBTAINED ARE LESS THAN DESIRABLE.
LIMITATIONS AND PRECAUTIONS
AVOID MOISTURE CONTAMINATION IN SEALED CONTAINERS. Store in a dry environment at temperatures between 40°F - 100°F. KEEP AWAY FROM HEAT, OPEN FLAME OR SPARKS. USE ONLY IN WELL VENTILATED AREAS WITH PROPER PROTECTIVE EQUIPMENT. Avoid breathing vapor or mist.
TYPICAL PHYSICAL PROPERTIES
| Solids (By weight): | 75 ± 2% |
| Weight: | 9.2 lbs. per gal. |
| Visocsity: | 2700 - 3000 cps |
| Cure Times: | 6 hrs. to touch 8 - 12 hrs. tack free 12 - 16 hrs. recoat |
| Flash Point: | 80°F |
| Shelf Life: | 90 days @ 40° - 90°F |
| Tensile Strength: | 900 psi ± 25 |
| Elongation: | 350% ± 50 |
| Permeability: | .02 perm inch |
| Water Absorption: | 2.4% |
| Adhesion: | Exceeds Tensile |
| Hardness: | 65 Shore A |
| Clean Up Solvent: | MEK |
| Service Temp: | -50° - 200°F |
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