Foster® 90-07 H.I. MASTIC®
FOSTER H.I. MASTIC ®
FOSTER H.I. MASTIC is a highly durable, protective weather coat for use over thermal insulation installed outdoors where an economical breathing mastic is required.
FOSTER H.I. MASTIC is an asphalt emulsion. It will not crack (particularly at the critical right angle bends) during curing. It has exceptional weathering stability and develops with its final set a firm, durable surface with good resistance to acids, alkalies, abrasion, and other abuses typical of outdoor industrial conditions. It has no heat flow, remaining hard and stable under all normal operating temperatures.
FOSTER H.I. MASTIC meets requirements for LEED IEQ 4.2 Low-Emitting Materials, Paints and Coatings. VOC: 21 g/l, less water and exempt solvents.
FOSTER H.I. MASTIC contains no asbestos, lead, mercury, or mercury compounds.
Store and apply between 40°F (4°C) and 100°F (38°C). Protect from freezing until dry. As with all asphalt emulsion products, application over insulations or cements containing soluble salts may show efflorescence or white scale deposits on the surface if water is present in the insulation. Efflorescence may be removed by normal rainfall or washing after mastic is dry but may recur if water continues to be present in the insulation. To resist rain washoff, allow at least 24-48 hours drying time above 60°F (16°C), with a relative humidity of 50%. Higher humidity or lower temperatures may retard drying.
H.I. Mastics may dry and weather to a dark gray color. Outdoor horizontal surfaces must always drain completely. A pitch of at least 1/2 inch per foot (4 cm/m) is required. Not recommended for indoor use. Always test foil and paper facings for acceptable adhesion before using.
AVERAGE WEIGHT/U.S. GALLON:
8.7 lbs. (1.0 kg/l)
AVERAGE NON-VOLATILE :
50% by volume (52% by weight)
COVERAGE RANGE :
(Subject to type of surface being coated.) Wet coverages shown below are for smooth non-porous surfaces. Porous or rough surfaces may require higher gallonage to attain required dry thickness.
Dry Thickness: 0.112 in. (2.8 mm) to 0.123 in. (3.1 mm) Equivalent Wet Coverage: 0.25 in. (6.4 mm) 16 gallons per 100 sq. ft. (6.5 l/m2)
Touch: 8 hours at 73°F (22.8°C) Through: 24 hours at 73°F (22.8°C)
WATER VAPOR PERMEANCE (ASTM F 1249):
1.0 perm at 1/8 in. dry film thickness (0.7 metric perm at 3.2 mm)
SERVICE TEMPERATURE LIMITS:
(Temperature at coated surface) Minus 20°F to 200°F (-29.0°C to 93.3°C)
WET FLAMMABILITY (ASTM D 3278):
Greater than 200°F (93°C)
TM TradeMark of H.B. Fuller Construction Products Inc.
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