Dow Corning 99180649 Rtv Silicone Joint Sealant 10.1 Oz

Product Description

The DOW CORNING 99180649 is a black RTV silicone joint sealant packaged in a 10.1 oz cartridge, part of the 739 series. It cures at room temperature to form a flexible, durable seal rated for continuous service from -49 degrees F to 392 degrees F. Tack-free time is 75 minutes, with full cure achieved in 24 to 72 hours. HVAC technicians, plumbers, and mechanical contractors use this sealant to seal joints, seams, and penetrations where thermal cycling and vibration resistance are required. It meets UL 94 V-1 flame-rating standards.

This sealant is suited for residential and light commercial mechanical applications where a flexible, heat-resistant seal is needed. It adheres directly to ceramic, glass, and metal substrates without a primer in most conditions. Common uses include sealing ductwork joints, HVAC cabinet penetrations, flue collar joints, and similar metal-to-metal or metal-to-glass assemblies. The black color makes it a practical choice for visible seams on dark equipment surfaces where appearance matters alongside performance.

Key Features

• RTV silicone chemistry provides a flexible, permanent seal after room-temperature cure
• Operating range of -49 degrees F to 392 degrees F suits high-heat HVAC and mechanical applications
• 75-minute tack-free dry time allows repositioning before the seal sets
• Adheres to ceramic, glass, and metal substrates
• UL 94 V-1 flame-rated for use in and around electrical and mechanical enclosures
• Standard 10.1 oz cartridge fits common caulk guns used in the trade

Compatibility

Designed as an OEM-compatible sealant for use on metal, glass, and ceramic surfaces in HVAC, plumbing, and general mechanical assemblies where a flexible, heat-resistant silicone joint sealant is specified.

Installation Notes

This sealant is applied by licensed HVAC technicians, plumbers, or mechanical contractors using a standard cartridge caulk gun. Surfaces should be clean, dry, and free of oil or loose material before application for proper adhesion. Allow the sealant to reach full cure before exposing the joint to operating temperatures or pressure. Work in a well-ventilated area, as acetic-acid off-gassing is common during the cure cycle of RTV silicone products.