Dow Corning 3145 90ML Gry Silicone Sealant Gray Tube

Product Description

The DOW CORNING 3145 90ML GRY is a gray silicone sealant packaged in a tube, formulated for high-temperature applications in HVAC, electrical, and industrial service environments. Silicone chemistry provides flexible, durable bonds and seals that resist degradation at sustained elevated temperatures up to 200 degrees C. Licensed HVAC technicians, electricians, and mechanical contractors reach for this type of sealant when sealing penetrations, encapsulating components, or bonding dissimilar materials where thermal cycling would crack or degrade standard adhesives. The gray color blends with metal housings and electrical enclosures common in commercial and residential mechanical systems.

This sealant is suited for sealing around ductwork penetrations, electrical junction box entries, HVAC cabinet seams, and similar applications where a flexible, heat-resistant seal is required. It performs in both residential and light commercial mechanical systems. The tube format delivers controlled application without requiring a caulk gun, making it practical for targeted repairs and fieldwork where access is tight or quantities are small.

Key Features

• Silicone chemical base provides flexibility and resistance to thermal cycling
• Rated for continuous service up to 200 degrees C
• Gray color suits metal panels, enclosures, and mechanical housings
• Tube container allows direct application without additional dispensing tools
• Appropriate for sealing, bonding, and encapsulating in high-heat environments

Compatibility

Designed as an OEM-style replacement silicone sealant for use in residential and commercial HVAC, electrical, and mechanical service applications requiring high-temperature performance.

Installation Notes

Surface preparation is critical — clean and dry all substrate surfaces before applying sealant to ensure proper adhesion. Power down electrical systems and isolate HVAC equipment before applying sealant near live components or energized panels. Allow full cure time before returning the sealed assembly to service. Application and use in occupied spaces should comply with local ventilation requirements and applicable building codes.