Foster® H.I. Mastic® 90-07
1 of 39 products in this brandFoster® H.I. Mastic® 90-07 is a durable protective weather coating specifically designed for outdoor use over thermal insulation when an economical breathing mastic is needed. This asphalt emulsion product is crack-resistant, even at critical right-angle bends during curing. It exhibits exceptional weathering stability, resulting in a firm and durable surface that withstands acids, alkalies, abrasion, and typical outdoor industrial conditions.
RTU Product Type: Coating
Features: Abrasion Resistant, Acid Resistant, Alkali Resistant, Good Weather Stability
Application Area: Thermal Insulation
Application Method: Trowel
Enhanced TDS
Identification
- GBU
- RTU Product Type
- Categories
Applications
- Application Area
- Application Method
Applications & Uses
- Coverage Range
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- 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)
- Limitations
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- Store and apply between 40°F and 100°F.
- 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, 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.
- Preparation and Application Information
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Material Preparation
- Do not thin. Stir well, but do not use sticks or boards, which would splinter or otherwise contaminate the product. Apply only to clean, dry, oil free surfaces. Keep container closed when not in use. Cement coats must be dry. This product cannot be successfully applied by brush or spray.
Application - Outdoor and Heavy Duty Service
- To prevent water infiltration, properly flash all penetrations.
- Prime dusty insulation or porous cements with an asphalt primer.
MAST-A-FAB® Reinforcement
- Apply tack coat of H.I. Mastic at 8 gal. per 100 sq. ft. (3.3 l/m2) by trowel.
- Embed MAST-A-FAB white membrane into the wet tack coat, Smooth membrane to avoid wrinkles and overlap all seams at least 2 inches (51 mm). Apply finish coat of H.I. Mastic at 8 gal. per 100 sq. ft. (3.3 l/m2). The second coat shall be applied immediately following the initial set of the first coat while it is still damp.
- This application shall provide a minimum dry film thickness of 128 mils (3.2 mm).
Heavy Duty Applications - Up to 50% greater Tensile Strength
- Apply as above, substituting Chil-Glass #5 as the reinforcing membrane. Note that the membrane weave pattern will show through the dried mastic.
Trowel
- Apply evenly with a minimum of overworking of material. May be applied with a rubber glove on small radius pipes and vessels.
Clean Up
- Clean equipment with clean fresh water before mastic dries, followed by mineral spirits (flammable) or chlorinated solvent (non- flammable). Use mineral spirits or chlorinated solvent after mastic dries.
Features
- Ready-to-Use Product Features
Features & Benefits
- Labeling Claims
Packaging & Availability
- Regional Availability
Physical Properties
- Color (Properties)
- Physical Form
Properties
- Application Properties
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Value Units Test Method / Conditions Application Temperature 4 - 38 °C - Dry Film Thickness 3.2 mm - Service Temperature Limits (at coated surface) -29.0 to 93.3 °C - - Typical Properties
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Value Units Test Method / Conditions Coverage (dry thickness) 2.8 - 3.1 mm - Coverage (equivalent wet coverage) 16 gal/100ft² - Density 8.7 lbs/gal ASTM D1475 Drying Time (at 22.8°C, through) 24 hours - Drying Time (at 22.8°C, touch) 8 hours - Flash Point (wet flammability) min. 93 °C ASTM D3278 Non-Volatile Content 50 Vol(%) - Non-Volatile Content 52 Wt(%) - Storage Temperature 4 - 38 °C - Volatile Organic Compound Content (less water) 21 g/L - Water Vapor Permeance (at 1/8 inch dry film thickness) 1 perms ASTM F1249
Regulatory & Compliance
- Chemical Inventories
Storage & Handling
- Shelf Life
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12 months