Enhanced TDS
Identification & Functionality
- Technologies
- Product Families
Features & Benefits
- Labeling Claims
- Ready-to-Use Product Features
- Product Highlights
- FOSTER® VAPOR-SAFE® MASTIC is a high solids, water-based, fire- resistive, flexible, vapor retarder finish for most types of thermal insulation, including polystyrene foam.
- It may be used over dry concrete and finishing cement.
- VAPOR-SAFE® MASTIC is non-flammable when wet and has a mild, latex “paint-type” odor.
- It is designed for heavy duty/industrial use over insulation on pipes, vessels, ducts and equipment operating below ambient temperatures.
- It may also be used indoors. VAPOR-SAFE® MASTIC has the water resistance and low water vapor permeance normally only found in solvent-based products.
- It can be used in high humidity environments and greatly retards water vapor permeation.
- VAPOR-SAFE® MASTIC is ideal for vapor sealing ASJ, FRK and FSK jackets and board facings at joints, laps and over staple and weld pin punctures.
- It is an excellent duct board closure sealant. Do not exceed 1/8" (3.2 mm) wet film thickness.
- VAPOR-SAFE® MASTIC contains no asbestos, lead, mercury or mercury compounds.
- VAPOR-SAFE® MASTIC meets the requirements of Military Specification MIL-PRF-19565C, Type II using method ASTME96, Procedure A permeance and is QPD listed.
- VAPOR-SAFE® MASTIC 30-90 meets the requirements of:
- MAS Certified Green®
- California Dept. of Public Health Standard Method v1.2
- VOC Emissions and Content requirements to contribute to LEED v4 EQ Credit: Low Emitting Materials – Paints and Coatings
- Collaborative for High Performance Schools EQ 7.1
Applications & Uses
- Markets
- Application Area
- Application Method
- Compatible Substrates & Surfaces
- Preparation and Application Information
Preparation
- Do not thin.
- Apply only to clean, dry, oil-free surfaces.
- Keep container closed when not in use.
- Stirring is usually not necessary.
- Application
- To prevent water vapor and moisture infiltration, proper and complete flashing is required.
- Follow flashing specifications.
Heavy duty/industrial outdoor
- Apply a tack coat of FOSTER® VAPOR-SAFE® MASTIC (color as selected) at 2 gallons per 100 square feet (0.8 l/m2 ).
- Embed Foster® MAST-A-FAB® White Membrane into the wet tack coat. Smooth membrane to avoid wrinkles and overlap all seams at least two inches (5 cm). Apply finish coat of VAPOR-SAFE® MASTIC, within 1/2 hour after the tack coat application, at 4 gallons per 100 square feet (1.6 l/m2 ).
- This application shall provide a minimum dry film thickness of 57 mils (1.4 mm).
- Over cellular glass insulation, increase the coverage to 7 gallons per 100 square feet (2.9 l/m2 ).
Indoor and light duty outdoor
- Apply as above, except that the finish coat shall be 2 gallons per 100 square feet (0.8 l/m2 ) and the minimum dry film thickness shall be 37 mils (0.9 mm).
Trowel or glove
- Use clean steel trowel.
- Apply each coat in full thickness before initial set. Avoid excessive troweling.
- Cleaning Information
- Use fresh water to clean brushes and equipment before product dries.
- Dry product may be removed with hot soapy water (with ammonia added) or strong solvents such as chlorinated solvent (non-flammable) or xylol (flammable).
Properties
- Color
- Physical Form
- Typical Properties
- Application Properties
- Flame Characteristics
| Value | Units | Test Method / Conditions | |
| Average Weight / U.S. Gallon | 1.38 | kg/l | ASTM D1475 |
| Average Non-Volatile (by Volume) | 59.0 | % | ASTM D2369 |
| Average Non-Volatile (by Weight) | 71.0 | % | ASTM D2369 |
| Coverage Range | 4 - 6 | gal./100 sq. ft | - |
| Drying Time (Set to Touch) | 4.0 | Hours | - |
| Drying Time (Dry Through) | 24.0 | Hours | - |
| Water Vapor Permeance | 0.03 | Perms | ASTM E96, PROCEDURE A |
| Water Vapor Permeance | 0.05 | Perms | ASTM E96, PROCEDURE A |
| Water Vapor Permeance | 0.08 | Perms | ASTM F1249 |
| Wet Flammability | 100.0 | °C | - |
| Value | Units | Test Method / Conditions | |
| Service Temperature Range | -29 to 82 | °C | - |
| Value | Units | Test Method / Conditions | |
| Surface Flame Spread | 15.0 | - | ASTM E84 |
| Smoke Developed | 30.0 | - | ASTM E84 |
Regulatory & Compliance
- Certifications & Compliance
- Chemical Inventories
Storage & Handling
- Shelf Life
- 12 months
- Handling Conditions
- Store and apply between 40°F (4°C) and 100°F (38°C), protect from freezing until dry.
- To resist rain wash-off, allow at least 8-12 hours drying time above 50°F (10°C), with a relative humidity of 50%.
- Higher humidity and/or lower temperature may retard drying.
- Always select VAPOR-SAFE® MASTIC in the white color for use over polystyrene on outdoor installations.
- After outdoor exposure, 30-90 may weather to an off-white color.
- 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" per foot (4 cm/m) is recommended.