Foster® 60-38 / 60-39 MONOLAR® II MASTIC
FOSTER ® MONOLAR ® II MASTIC
FOSTER MONOLAR II Mastic based on chlorosulfonated polyethylene rubber (formerly known as Hypalon ® *) is a tough, flexible, fire-resistive elastomeric finish for protection of thermal insulation. It is also used as a vapor barrier finish for fittings. It is excellent for outdoor use where good color retention, chemical resistance, and durability are required.
MONOLAR II Mastic provides outstanding weather barrier and vapor barrier protection for most board stock thermal insulations except polystyrene. It normally bonds well to aluminum foil facings, but a test application is recommended to confirm adhesion.
MONOLAR II Mastic is produced under the classification and follow up service of Underwriter's Laboratories, Inc.
MONOLAR II Mastic meets NFPA 90A and 90B 25/50 requirements.
MONOLAR II Mastic contains no asbestos, lead, mercury, or mercury compounds.
Store and apply between 40°F (4°C) and 100°F (38°C). For best results, select Elastolar 95-44 or Flextra 95-50 for insulation joint sealing under Monolar Mastic. Always test plastic materials for compatibility when using a solvent base product. Outdoor horizontal surfaces must always drain completely. A pitch of at least 1/2 inch per foot (4 cm/m) is required. Make certain this product is completely dry and the area free from solvent odor if food is involved. Select Monolar II Coating 60-95 (white) or 60-96 (gray) for airless spray or brush application.
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* Chlorosulfonated polyethylene rubber is also known as Hypalon, a trademark of Dupont Performance Elastomers, and is no longer produced by Dupont.
60-38 White 60-39 Gray Other colors available on special order
Trowel or rubber glove
AVERAGE Weight/U.S. gallon (ASTM D 1475):
8.8 to 9.3 lbs. (1.05 to 1.11 kg/l)
AVERAGE NON-VOLATILE (ASTM D 1644):
30% by volume, 43% by weight
COVERAGE RANGE (FSTM 72):
(Subject to the nature of material coated) Wet coverages shown below are for smooth non-porous surfaces. Porous or rough surfaces will require higher gallonage to attain required dry thickness.
0.030 in. (0.8 mm)
EQUIVALENT WET COVERAGE:
0.096 in. (2.4 mm) 6 gal./100 sq. ft. (2.4 l/m2 )
DRYING TIME 73°F (23°C) 50% RH (ASTM D 1640):
Set to Touch: 3 hours
Dry Through: 48 hours
SERVICE TEMPERATURE LIMITS (FSTM 70):
(Temperature at coated surface) Minus 40°F to 250°F (-40°C to 121°C)
WATER VAPOR PERMEANCE:
ASTM E 96, Method A 0.025 perms (0.016 metric perms) at 30 mils dry (0.76 mm) ASTM E 398, 0.08 perms (0.05 metric perms) at 30 mils dry (0.76 mm). ASTM E 96, Procedure E 0.011 perms (0.007 metric perms) at 50 mils dry (1.27 mm)
WET FLAMMABILITY (ASTM D 3278):
Flash point 110°F (43°C)
SURFACE BURNING CHARACTERISTICS (ASTM E 84):
Flame spread: 20
Smoke Developed: 10-40
Tested at coverage rate of 25 sq. ft./gal. (.61 m2 /l).
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.