Foster® 46-50 WEATHERITE™ Mastic
FOSTER ® WEATHERITETM MASTIC
FOSTER WEATHERITE MASTIC is a fibrated water-based breather mastic. It features a bright white color and extremely smooth, creamy, thixotropic consistency for fast, easy application.
WEATHERITE MASTIC has excellent brush, trowel, and spray properties, is non-flammable when wet, and has a mild odor during application.
WEATHERITE MASTIC forms a tough, fire-resistive dry film that is extremely flexible and provides a smooth, attractive finish on both indoor and outdoor applications. It has excellent adhesion to most foil facings. It may be used over a wide variety of thermal insulations including polystyrene and rigid polyurethane board stock insulations.
WEATHERITE MASTIC complies with current requirements regarding use in meat and poultry processing areas under federal inspection. Letter of certification is available upon request.
WEATHERITE MASTIC is produced under the classification and follow- up service of Underwriter's Laboratories, Inc. and meets NFPA 90A and 90B 25/50 requirements.
WEATHERITE MASTIC meets requirements for LEED ® IEQ 4.2 Low-Emitting Materials, Paints and Coatings. VOC: 47 g/l, less water and exempt solvents.
Store and apply between 40ºF (4ºC) and 100ºF (38ºC), protect from freezing until dry. To resist rain washoff, allow at least 24 hours drying time above 60ºF (16ºC) with a relative humidity of 50%. Higher humidity and/or lower temperatures will retard drying. Always test foil and paper facings for acceptable adhesion before using. Outdoor horizontal surfaces must always drain completely. A pitch of at least 1/2 inch per foot (4cm/m) is required. Always select WEATHERITE Mastic in the white color for use over Polystyrene on outdoor installations. TM TradeMark of H.B. Fuller Construction Products Inc.
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46-50 Bright White 46-51 Light Gray Other colors available on special order.
Trowel, glove, brush or airless spray
AVERAGE WEIGHT / U.S. GALLON (ASTM D 1475):
11.3 lbs. (1.35 kg/l)
AVERAGE NON-VOLATILE (ASTM D 2369):
52% by volume (64% by weight)
(Subject to the nature of material being coated.) Wet coverages shown below are for smooth non-porous surfaces. Porous or rough surfaces will require higher gallonage to attain required dry thickness.
0.038 in. to 0.058 in. (1.0 mm to 1.5 mm)
EQUIVALENT WET COVERAGE:
0.062 in. to 0.096 in. (1.6 to 2.4mm) 4-6 gal./100 sq. ft. (1.6 to 2.4 l/m2)
SERVICE TEMPERATURE LIMITS:
(Temperature at coated surface) -20ºF to 180ºF (-29ºC to 82ºC)
DRYING TIME 73ºF (23ºC) 50% RH:
Set to Touch: 2 hours
Dry Through: 24 hours
WATER VAPOR PERMEANCE (ASTM E 96):
> 1 perm at 1/16 inch (1.6mm) dry film thickness tested per Procedure B
WET FLAMMABILITY (ASTM D 3278):
No flash to boiling, 205ºF (96ºC)
SURFACE BURNING CHARACTERISTICS (ASTM E 84):
Flame Spread: 10
Smoke Developed: 40
Tested at coverage rate of 16.7 sq. ft./gal. (6 gal./100 sq. ft., 2.4 l/m2).
Applied to 1/4 inch (6.4 mm) inorganic reinforced cement board. The flame spread may vary at different product thicknesses and/or when applied over other surfaces.