Dow Corning 99180621 Rtv Silicone Joint Sealant 10.1 Oz

Product Description

The DOW CORNING 99180621 is an RTV silicone joint sealant packaged in a 10.1 oz cartridge, part of the 739 series. It delivers a flexible, durable seal on a wide range of surfaces and is formulated for use in HVAC, plumbing, and general mechanical applications where temperature extremes and vibration are common factors. The sealant reaches a tack-free state in 75 minutes and achieves full cure in 24 to 72 hours. It maintains performance across an operating temperature range of -49 degrees F to 392 degrees F. Licensed trades and maintenance professionals use this product when sealing joints, penetrations, and connections that require long-term flexibility and adhesion.

This sealant is suited for residential and light commercial applications involving ceramic, glass, and metal substrates. Typical install scenarios include sealing around HVAC equipment housings, ductwork penetrations, pipe stubs, and mechanical enclosures where a heat-resistant, flexible seal is required. The white color makes it appropriate for visible joints where appearance matters. The single-use 10.1 oz cartridge format is compatible with standard caulking guns used by HVAC technicians, plumbers, and general maintenance contractors.

Key Features

• RTV silicone formulation provides a flexible, long-lasting seal resistant to temperature cycling
• Operating range of -49 degrees F to 392 degrees F suits demanding mechanical environments
• Tack-free in 75 minutes with full cure in 24 to 72 hours
• Adheres to ceramic, glass, and metal surfaces without mechanical fasteners
• UL 94 V-1 rated for flame resistance
• 10.1 oz cartridge fits standard caulking guns for fast, controlled application

Compatibility

Designed for use on ceramic, glass, and metal substrates in joint sealing applications. Part of the DOW CORNING 739 series, referenced by series part number 739-White.

Installation Notes

This product is installed by HVAC technicians, plumbers, and mechanical contractors using a standard cartridge caulking gun. Surfaces should be clean, dry, and free of oil or loose material before application to ensure proper adhesion. Allow adequate cure time before exposing the joint to operating temperatures or fluid contact. Follow applicable building and mechanical codes governing sealant use in occupied spaces or plenum environments.