Childers® CP-147 HVAC Duct Sealant

• Water-based for personal & environmental safety.
• Application is quick & easy for economical installation.
• Dries firmly & forms a strong, resilient seal.
• Creates a permanently flexible seal (even when system cycles between high and low temperatures).
• Long service life.
• Quick & efficient cleanup of tools & metal with hot water when sealant is still wet.

• CP-147 is used to seal all metal joints in high, medium and low pressure air handling ductwork systems. Application by trowel, brush or extrusion readily fills the joints of round, rectangular, rigid or flexible ductwork, diffusers and mixing boxes.
• It can also be used to seal ASJ, FRK and FSK jackets and board facings at joints and laps.

Material Preparation

• All surfaces where sealant will be applied must be clean, dry and free of oil or grease prior to application.
• Do Not Thin.
• Keep container closed when not in use.

Application

• UL 181B Mastic Closure OF UL 181 Flexible Air 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 80 sq. ft./gal. (2.0 m2 /l). Allow the completed joint to dry at least 48 hours above 70°F (21°C) before pressure testing. High humidities (over 70%) and/or cooler temperatures may retard drying. Total wet film thickness to be 20 mils (0.5 mm).
• Other Sealing Applications – Not UL181: Apply a continuous film of duct sealant over all areas of the 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 sealant to the male end of the coupling prior to fitting the straight run of spiral duct over it. Brush excess sealant over the joint to complete the seal. Screw holes and flanges should also be sealed with a coat of duct sealant. It may be applied to the inside or the outside of the duct.
• Top Coating: After it is completely dry, CP-147 may be top coated with good-quality, water-based paint.
• Power Extrusion: CP-147 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 90,000 - 140,000 cps. Corrosion resistant pumps and fittings are suggested.

¹ - Temperature, humidity and film thickness will affect drying time.

² - Applied to Inorganic Reinforced Cement Board. Tested as applied in a two in. wide strips spaced 8 in. on center, at a rate of 45 sq. ft. per gal.

• 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
• VOC Content: 13 g/l, less water and exempt solvents
• Collaborative for High Performance Schools EQ 7.1
• CP-148 Chil-Duct is produced under the classification and followup service of Underwriter’s Laboratories, Inc.
• Meets NFPA 90A and 90B 25/50 requirements
• Meets all SMACNA pressure classes up to 10” w.g. and SMACNA seal classes A, B and C on ducts constructed to SMACNA standards

• Apply between 40°F and 100°F; protect from freezing.
• To resist rain wash off, allow at least 16 hours drying time above 40°F, 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 1/4 inch per foot (2 cm/m) is required.
• If used between two impermeable surfaces, drying time will be extended.

Store between 40°F and 100°F; protect from freezing.