Nu-calgon NUCAL-4293-04 Expanding Foam Sealant 9 Oz

Product Description

The NU-CALGON NUCAL-4293-04 is an expanding polyurethane prepolymer foam sealant designed to seal and insulate gaps, penetrations, and openings in HVAC, refrigeration, and heating installations. The formula expands after application to fill irregular voids and create an airtight, insulating barrier. Packaged in a 9 oz can, it is suited for field use by HVAC technicians and plumbers who need a fast, reliable sealant for utility penetrations and duct joint applications. The cured foam resists unwanted air infiltration while providing a secondary insulating layer around penetrations.

This foam sealant is used in residential and light commercial HVAC, refrigeration, and heating service work. Typical applications include sealing openings created for air conditioning line sets, refrigeration tubing, and heating pipes, as well as duct joints, utility penetrations through exterior sheathing, masonry, concrete, and wood walls. Any location where air infiltration around pipe or duct penetrations is a concern is a valid use case for this product. It is a common item on service trucks for both new installation and maintenance calls.

Key Features

• Expanding polyurethane prepolymer formula fills irregular gaps and voids on contact
• Functions as both a sealant and an insulating material in a single application
• Suitable for use on masonry, concrete, wood, and exterior sheathing substrates
• 9 oz can size is compact for field and truck-stock use
• Seals around HVAC line sets, refrigeration tubing, heating pipes, and utility penetrations

Compatibility

Designed as an OEM-style sealant and insulating foam for use in residential and commercial HVAC, refrigeration, and heating system installations where air penetration control at pipe and duct openings is required.

Installation Notes

Applied by licensed HVAC technicians, plumbers, or qualified installers as part of system rough-in or service work. Ensure the substrate is clean and free of loose debris before application; the foam adheres best to slightly moistened surfaces. Allow full cure time before covering or painting the foam. Follow applicable building and energy codes for air-sealing requirements at utility penetrations.

Technical Specifications

• Type: Expanding Polyurethane Prepolymer Foam Sealant
• Volume: 9 oz

Standard Information

• Brand: NU-CALGON
• Manufacturer Part Number: NUCAL-4293-04