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Loctite
SKU: 94483658
Loctite - Joint Sealant: 300 mL Cartridge, Clear, RTV Silicone, 300 Milliliter Container
$51.35 -
$43.02 -
$19.43 -
$83.83 -
$30.87
Sealants & Adhesives
(Showing 5 of 5)HVAC INSTALLATION SUPPLIES
HVAC Sealants, Adhesives & Duct Compounds
We help HVAC contractors and installers source duct sealants, pipe thread compounds, adhesives, and sealing materials for HVAC installation and service applications. Availability may vary by supplier, stock status, and product type.
What This Category Includes
Sealants and adhesives are essential for airtight duct systems, leak-free pipe connections, and proper insulation installation. This category covers products used throughout HVAC installation, service, and maintenance workflows.
ⓘ Always verify product compatibility with the substrate material, operating temperature, and applicable codes (UL 181, NFPA 90A/90B) before use.
Duct Mastic Sealant
Water-based mastic for sealing duct joints, seams, and connections. UL 181-compliant. Applied with brush or trowel over mesh tape for larger gaps.
Foil Tape
UL 181A and 181B-rated aluminum foil tape for duct sealing. Used with mastic for code-compliant duct sealing on sheet metal and flex duct.
Pipe Thread Compound
Thread sealant for threaded pipe connections on gas lines, refrigerant service ports, and water piping. Available in paste and PTFE tape forms.
Duct Insulation Adhesive
Contact adhesive for bonding duct liner and insulation to sheet metal ductwork. Rated for HVAC operating temperatures.
Refrigerant Line Insulation Tape
Self-sealing insulation tape for covering joints and repairs in refrigerant line insulation.
Caulk & Weatherstripping
Sealants for sealing penetrations, line set openings, and air gaps at equipment installations.
Frequently Asked Questions
Q: What sealant is used for HVAC ductwork?
Water-based mastic sealant is the most common duct sealant for sealing duct joints and seams. It is applied with a brush and is UL 181-compliant for use with flexible and sheet metal ductwork. Foil tape (UL 181A or 181B rated) is used in combination with mastic for duct sealing.
Q: What is pipe thread compound used for in HVAC?
Pipe thread compound (pipe dope) is applied to threaded pipe connections to prevent leaks and ease assembly. It is used on gas line fittings, refrigerant service port threads, and water pipe connections. Verify compatibility with the pipe material and fluid type before use.
Q: Can I use silicone sealant on HVAC ductwork?
Standard silicone is not recommended for duct sealing as it does not adhere well to dusty or oily duct surfaces and is not UL 181-listed. Use water-based mastic or UL 181-rated foil tape for duct sealing applications.
Q: What adhesive is used to install duct insulation?
Duct insulation adhesive (duct liner adhesive) is used to bond fiberglass duct liner to sheet metal ductwork. It is a contact adhesive applied to both surfaces before pressing together. Verify the product is rated for the operating temperature range of the duct system.
Need Help Sourcing HVAC Sealants or Adhesives?
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