739 Ultra Finish BrushSeal™ Coating is a vapor-barrier coating formulated to match many of the newer types of facing now being used by insulation manufacturers. It is specifically formulated for optimal use on systems operating below ambient temperature but not below 32º F, but it can also effectively be used on some dual systems operating at moderate temperature ranges such as HVAC systems. It effectively retards the passage of water vapor on applications such as chilled water lines, air conditioning ducts, or other pipes or vessels within these temperature parameters. Colder systems than the above are better protected with Vimasco’s 749 VaporBlok™ which has a lower perm rating and is designed for heavy-duty applications. On all cold systems, vapor barrier coatings will only perform well when the proper thickness of insulation is used.
739 Ultra Finish BrushSeal™ is formulated to have a smooth consistency which is easy to apply by brush. It can also be sprayed with the proper equipment. It is an excellent match with the new Knauf facing and also newer facings from Owens Corning and Johns Manville.
739 Ultra Finish BrushSeal™ is a safe, water-based product which has a mild latex type odor. It is fire resistive, meeting 25/50 flame and smoke requirements, and maintains its slightly shiny white sheen after application. It can be used indoors or outdoors though it should be noted that when exposed to UV light its color may dull slightly. Being a water-based product, 739 Ultra Finish should not be applied on flat surfaces where it will be subjected to ponded water.
Protect from freezing during shipping and storage. After application, it must be protected from freezing and from precipitation or condensation until it is completely cured.
Product Information Data
APPLICATION TEMPERATURE RANGE
40°F (4°C) to 120°F (49°C)
WATER VAPOR PERMEANCE (ASTM E96 Proc A)
.04 U.S. Perms at 40 mils dry film
WET FLAMMABILITY (ASTM D 93)
No flash to boiling, 212ºF (100ºC)
WATER VAPOR PERMEANCE (ASTM F 1249)
Less than .08 U.S. Perms at 32 mils dry film
VOC (Volatile Organic content, less water) (ASTM D 3960)
MEETS REQUIREMENTS FOR LEED CREDIT 4.2
COVERAGE (ASTM C 461)
25 sq. ft/gal at recommended minimum thickness of 1/16” wet. This yields a dry film thickness of 32 mils.
90% (30 mils dry @ 70ºF) (.76 mm dry @ 21ºC)
DRYING TIME (ASTM D 1640)
To touch: 2 to 4 hours; Through: 12 to 48 hours (Depending upon temperature, relative humidity, and substrate)
Wet state – water; Dry state – safety solvent
WEIGHT PER U.S. GALLON (ASTM D 1475)
10.7 pounds (1.28 kg/liter)
RECOMMENDED SHELF LIFE
12 months in unopened container at 40ºF (4ºC) to 90ºF (32ºC) (Note: If stored correctly, product often remains stable much longer than this.)
65% by weight; 55% by volume
Do not add water to this product as that will change its physical properties and performance. No expressed or implied warranty will be offered on applications where the product has been thinned or altered in any way.
SERVICE TEMPERATURE RANGE
-20ºF to 180ºF (-29ºC to 82.2ºC)
Note: “Service temperature” refers only to the temperature of air or surfaces coming into direct contact with the coating. This should not be confused with the operating temperature of the system underneath the insulation, which may vary widely depending upon the effectiveness of the insulation used. 739 Brush Seal™ will lose some flexibility at very cold temperatures and will soften at very warm temperatures.
SURFACE BURNING CHARACTERISTICS
(ASTM E 84) Tested at Underwriters Laboratories, Inc.
Flame Spread: 0; Smoke Developed: 0