SEALGUARD VFI®-991 Silicone

SEALGUARD VFI®-991 Silicone liquid applied coating forms a seamless film using silicone chemistry. SEALGUARD VFI- 991 provides UV stability and a waterproofing membrane in a single component package that cures at room temperature (RTV) and may be applied on site. SEALGUARD VFI-991 is a moisture cure elastomer specifically engineered for breathability and waterproofing that is resistant to oxidation and standard temperatures.

Low solids liquid applied roof coating that forms a seamless film using silicone. It provides a UV stable and waterproof membrane.

Features & Benefits

  • Standard Solids, 100% Silicone Elastomeric Coating
  • Seamless Liquid Applied Film with UV Stability
  • Superior Brightness for Maximum UV Reflectivity
  • Withstands Indefinite Exposure to Ponding Water
  • Excellent Adhesion to Wide Variety of Substrates
  • Resistant to Oxidation and High Temperatures
  • Exceptional Durability from a Trusted Manufacturer
  • Available in Standard and Premium Color Options
  • Formulated for Use Over: Metal, Mod/Bit, BUR, Single-Ply, Concrete, Spray Foam

Application Methods:

  • Spray
  • Brush
  • Roll

Available Packaging:

  • Drum
  • 5 Gallon

Product Details

  • Product Color: Standard colors available are white, light gray, medium gray and tan. For additional premium colors or color matching services contact Volatile Free, Inc.
  • UV Stability: This product is UV color stable and has long-term UV testing. For additional information contact Volatile Free, Inc.
  • Coverage/Thickness Requirement: See VFI specifications for specific coverage information or contact Volatile Free, Inc. for additional coverage/thickness requirements.
  • Storage Stability/Shelf Life: 12-month shelf life from date of manufacture when stored and sealed in unopened containers between 40°F - 75°F. Opened containers may be resealed with a nitrogen purge, but shelf life will be significantly shortened. Material should be brought to a minimum temperature of 65°F before use.
  • Equipment: SealGuard 991 Silicone may be applied by sprayer, roller, or brush. If sprayed use single component spray equipment capable of maintaining a minimum constant spray pressure of 5000 psi. 5:1 transfer pump should be used with drums. Contact Volatile Free, Inc. for more information on any specific equipment questions and requirements.
  • Surface Preparation: Surface preparation depends on application and substrate being coated. All surfaces should be cleaned, prepped and free of any oils, dirt or films that could affect the product adhesion. Contact Volatile Free Inc. with any additional questions.
  • Mixing: Mixing until uniform is required on all material before use. Mix times may vary depending on volume and mixing method, please contact Volatile Free, Inc. for more information on any specific mixing questions and requirements.
  • Material Application: Material can be applied between 40°F - 120°F. Standard application is a multiple coat method with 22 mil passes until the desired thickness is reached. Apply only when rain or other moisture contamination will not be present before fully cured. The time between subsequent coats should not exceed 48 hours, but materials should be allowed to cure before applying the second coat. Material cure time will vary with temperature.
  • Primers: Volatile Free, Inc. recommends adhesion patch testing before use and additional adhesion patch testing with the chosen primer. The following are approved primers for use with SealGuard 991. Contact Volatile Free, Inc. with any primer questions. • VFI-#11 • VFI-607 • VFI-1074-1 • VFI-3218
  • Cleanup: Preferred clean-up solvent is chemically dry mineral spirits. Please contact Volatile Free, Inc. for more information on clean-up of equipment and tools.
  • Thinning: Do not thin prior to application.
  • Precautions: See Safety Data Sheet for complete safety data. Do not add any foreign material to this product. Avoid prolonged breathing of vapors and prolonged or repeated skin contact. Use only with adequate ventilation.

SEALGUARD VFI®-991 Silicone Physical Properties

  • Tensile Strenth (ASTM D-412): 434 psi
  • Elongation (ASTM D-412): 245%
  • Final Elongation after 5000 hours (ASTM D-412): 279%
  • Tear Strength (ASTM D-624): 41 pli
  • Aged Solar Reflectance of White (ASTM C-1549): 0.7
  • Aged Thermal Emittance of White (ASTM C-1371): 0.9
  • Permeance (ASTM E96 Procedure B): 9.9 perm
  • Low Temperature Flexibility (ASTM D522 Method B): Pass

SEALGUARD VFI®-991 Silicone Liquid Properties

  • Solids by Weight (ASTM D 1644): 77.00%
  • Solids by Volume (ASTM D2697): 77.00%
  • Liquid Density (ASTM D 2939): 10.00 lbs/gal
  • Specific Gravity: 1.20 g/mL
  • Viscosity (ASTM D2196): 2000 cps
  • Tack Free Time: 1-2 hours @75°F, 50%
  • Cure Time: 2-4 hours @75°F, 50%
  • Recoat Time: 4-48 hours @75°F, 50%
  • Flash Point (ASTM D-56): 105°F
  • VOC: <250 g/L

Systems Used In

Standard Solid Silicone Roof System

Volatile Free, Inc. provides a very functional and easy to apply standard solids silicone roof system. In the system we use silicone chemistry to provide a room temperature curing (RTV) silicone that creates a monolithic membrane on a roof to prevent leaks and UV degradation and in combination with a primer provides excellent adhesion. Silicone is a premiere roofing product, because of the ability to resist ponding water and any standing water. Our Sealguard® 991 Standard Solid Silicone can work both as a topcoat and a basecoat to provide consistent properties throughout and ensure proper adhesion throughout the layers. 991 standard solids silicone is recommended to be used in white but can come in other colors depending on your need or your customers need. We have excellent adhesion using the standard solid silicone, because of a solvent content that can bite into substrates to provide better adhesion. Standard silicone requires adhesion patch testing, when required we recommend #11 Epoxy primer for most substrates. The #11 epoxy primer comes in a salmon color and a convenient 5-gallon kit that allows you to mix without an additional bucket.

Acrylic/Silicone Hybrid Roof System

Volatile Free, Inc. manufactures an Acrylic/Silicone Hybrid System that combines the best performance characteristics of acrylic and silicone liquid applied roof coating products. VFI®-640-1 Gray Acrylic Coating is used to anchor non-woven polyester fabric to any clean, dry substrate. Once the fabric is set, a second layer of VFI-640-1 is applied on top of the fabric, successfully waterproofing the layer and providing structural reinforcement to the coating system. SEALGUARD VFI®-991 Standard Solids Silicone exhibits a superior bond to existing coatings and spray foam systems without a need for primer and is widely used in recoat applications. Standard solids silicone can work both as a topcoat and a basecoat to provide consistent properties throughout and to insure proper adhesion between layers. SEALGUARD VFI-991 is primarily offered in white for enhanced reflectivity but is also available in other colors depending on the need of the customer. The Acrylic/Silicone Hybrid System is unique to the liquid applied roofing industry and is exclusive to Volatile Free, Inc. and VFI approved distributors.



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Product Data Sheets