Foster® Duct-FAS™ Duct Sealant 32-19™

• Foster® Duct-FAS™ Duct Sealant 32-19™ may be pressure tested after 24 hours dry time above 70°F (21°C). It quickly forms a strong bond to clean galvanized, aluminum and mild steel metal ducts.
• Foster® Duct-FAS™ Duct Sealant 32-19™ is ideal for sealing ASJ, FRK and FSK jackets and board facings at joints, laps and over staple and weld pin punctures, and for sealing flexible air ducts to rigid connectors.
• Foster® Duct-FAS™ Duct Sealant 32-19™ will meet all SMACNA pressure classes up to 10" w.g. and SMACNA seal classes A, B and C on ducts constructed to SMACNA standards. It has been tested up to 15" w.g. and passed with no sealant blow out.

Material Preparation

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

Application

UL 181B mastic closure of UL 181 flexible ducts: 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.. Total coverage rate to be 45 - 55 sq. ft./gal. Allow the completed joint to dry at least 24 hours above 70°F 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 Duct-FAS^TM Duct Sealant 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 of Duct-FAS™ Duct Sealant to the male end of the coupling prior to fitting the straight run of spiral duct over it. Brush excess Duct-FAS™ Duct Sealant over the joint to complete the seal. Screw holes and flanges should also be sealed with a coat of Duct-FAS™ Duct Sealant . It may be applied to the inside or the outside of the duct.

Power Extrusion

Duct-FAS™ Duct Sealant 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, Duct-FAS™ Duct Sealant 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 solvents such as chlorinated solvent (non-flammable) or xylol (flammable).

• To resist rain washoff, allow at least 16 hours drying time above 40o°F(4°C), with a relative humidity of 50%. Higher humidity or lower temperatures may retard drying.
• Always test foil and paper facings for acceptable adhesion.
• Outdoor horizontal surfaces must always drain completely. A pitch of at least 1/2 inch per foot (4 cm/m) is required.
• If used between impermeable surfaces, drying time will be extended.

¹ - Tested as applied in two 2 in. wide strips spaced 8 in. on center at a coverage rate of 45 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.