Foster® Safetee™ Duct Sealant 32-17

1 of 184 products in this brand
Foster® Safetee™ Duct Sealant 32-17 is a fire-resistive, fibrated, water-based sealant suitable for both indoor and outdoor use as a vapor barrier for low, medium, and high-velocity heating and air conditioning ducts. This versatile sealant serves as a strong and flexible adhesive and sealant, creating a robust barrier against air leakage. It can be applied with or without reinforcing tape or membrane, and for duct system rigidity, mechanical fasteners of the standard type and quantity are necessary.

Product Type: Sealant, Waterborne Sealant

Application Area: Brush

Application Method: Extrusion, Trowel

Features: Excellent Flexibility, Fire-Resistant, Good Toughness, Good UV Resistance, Good Weather Stability, Vapor Barrier, Water Resistant, Water-based

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Identification & Functionality

Features & Benefits

Product Highlights
  • Foster® Safetee™ Duct Sealant 32-17 is a fire-resistive, fibrated, water-based, indoor/outdoor vapor barrier sealant for low, medium and high velocity heating and air conditioning ducts.
  • It performs as a tough and flexible adhesive and sealant, forming a durable seal against air leakage when used with or without reinforcing tape or membrane.
  • Mechanical fasteners of the type and number normally used for duct assemblies are required to provide rigidity to the duct system.
  • Foster® Safetee™ Duct Sealant 32-17 has excellent weather resistance, low water vapor permeance and good water resistance, allowing it to be used outdoors and in high humidity environments.
  • It is U.V. resistant. When dry, it may be painted with good quality, water-based paint.
  • Foster® Safetee™ Duct Sealant 32-17 may be pressure tested within 16 hours dry time above 70ºF (21ºC) and below 60% RH.
  • It quickly forms a strong bond to galvanized, aluminum or mild steel metal ducts. It has a mild odor when wet.

Applications & Uses

Application Area
Application Method
Preparation and Application Information

Material preparation

  • Do not thin.
  • Apply only to clean, dry, oil-free surfaces.
  • Keep container closed when not in use.


  • Apply to clean, dry, oil-free surfaces by brush, trowel or power extrusion.
  • Uniformly brush out a 2” wide coat over the joint, at the nominal rate of 2 gal./100 sq. ft. (0.8 l/m2 ).
  • Total coverage rate to be 45 – 55 sq. ft./gal. (1.1 – 1.4 m2 /l).
  • Allow the completed joint to dry at least 24 hours above 70ºF (21ºC) before pressure testing. High humidities (over 70%) and/or cooler temperatures may retard drying.
  • Total wet film thickness to be 32 mils +/- 3 mils.
  • Other sealing applications – NOT UL 181:
  • Apply a continuous film of Foster® Safetee™ Duct Sealant 32-17 over all areas of the indoor or outdoor duct system where air leakage may occur.
  • A brush may be used to work the sealant into joints and remove excess.
  • On spiral ducts, apply a coat to the male end of the coupling prior to fitting the straight run of spiral duct over it.
  • Brush excess Foster® Safetee™ Duct Sealant 32-17 over the joint to complete the seal.
  • Screw holes and flanges should also be sealed with a coat of Foster® Safetee™ Duct Sealant 32-17.
  • It may be applied to the inside or the outside of the duct.
  • Power extrusion:
  • Foster® Safetee™ Duct Sealant 32-17 may be applied using a wide variety of power (pressure) extrusion equipment suitable for use with water-based sealants.
  • It is a soft buttery gel with a typical viscosity range of 130,000 – 160,000 cps.
  • Corrosion resistant pumps and fittings are suggested.
  • Top coating
  • After it is completely dry, Foster® Safetee™ Duct Sealant 32-17 may be top coated with good quality water-based paint.

Clean up 

  • Use fresh water to clean brushes and equipment before product dries.
  • Dry product may be removed with hot soapy water or strong solvent such as chlorinated solvent (non-flammable) or xylol (flammable).
  • Always test plastic materials for compatibility when using a solvent-based product.
  • Systems may be pressure-tested 36 hours after application, above 60°F (16°C).
  • Make certain this product is completely dry and the area free from solvent odor if food is involved.
Stoarage Information
  • Store and apply between 40°F (4°C) and 100°F (38°C).


Physical Form
Typical Properties
ValueUnitsTest Method / Conditions
Average Weight / U.S. Gallon11.6lb/galASTM D1475
Average Non-Volatile (by Volume)55.0% ASTM D2369
Shore Hardness (Type A)80.0-ASTM D2240
Water Vapor Permeance0.45PermsASTM E96, PROCEDURE A
Wet Flammability99.0°C-
Coverage Range (Brush, 0.064 in. – 0.032 in., wet film thickness)25 - 50sq. ft./gal.
Coverage Range (Caulking Gun, Linear, 1/8 in. bead )125.0ft./10.5 fluid oz. tube
Drying Time (Dry Through, at 23ºC, 50% RH)24.0Hours
Drying Time (Set to Touch, 23ºC, 50% RH)1.0Hour
Application Properties
ValueUnitsTest Method / Conditions
Service Temperature Range-7 to 93°C-
Flame Characteristics
ValueUnitsTest Method / Conditions
Surface Flame Spread¹5.0ASTM E84
Smoke Developed¹0.0ASTM E84

¹ - Tested as applied in two 2” wide strips spaced 8 in. on center at a coverage of 26.7 sq. ft./gal. 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.

Regulatory & Compliance

Chemical Inventories