Dow Corning 99180508 Rtv Silicone Sealant 300 Ml White

Product Description

The DOW CORNING 99180508 is a white RTV silicone sealant packaged in a 300 mL tube, part of the Series 738 product line. It forms a flexible, durable seal suited for applications that demand broad thermal tolerance, rated from -60 degrees C to 180 degrees C. The cured silicone resists moisture, vibration, and temperature cycling, making it a reliable choice for sealing, bonding, and gasketing tasks in mechanical and HVAC work. Licensed tradespeople and maintenance technicians reach for this product when a long-lasting, heat-resistant seal is needed on equipment housings, ductwork joints, and mechanical assemblies.

This sealant is appropriate for both residential and commercial service environments. It performs well in applications where thermal expansion and contraction stress a joint — such as around furnace panels, heat exchanger flanges, rooftop unit penetrations, and general mechanical equipment enclosures. The 300 mL tube format works with a standard caulking gun, making it practical for field service and shop use alike. HVAC technicians, plumbers, and general mechanical contractors commonly stock this product for a range of sealing and repair tasks.

Key Features

• RTV silicone chemistry cures at room temperature to a flexible, permanent seal
• Wide operating temperature range: -60 degrees C to 180 degrees C
• White color allows clean, finished appearance on visible joints
• 300 mL tube size works with standard caulking guns
• Series 738 formulation suited for moisture-resistant and vibration-resistant sealing

Compatibility

Designed as a general-purpose RTV silicone sealant suitable for use on metal, glass, and most non-porous substrates encountered in HVAC, plumbing, and mechanical service applications.

Installation Notes

Clean and dry all surfaces thoroughly before applying sealant to ensure proper adhesion and cure. Allow adequate cure time before exposing the joint to thermal cycling or mechanical stress. When working near energized equipment, follow lockout-tagout procedures before application. Consult the manufacturer safety data sheet for ventilation requirements, as silicone sealants release acetic acid or other byproducts during cure depending on formulation.