Imperial KK0203 Clear Silicone Sealant 10.3 Oz 450F

Product Description

The IMPERIAL MFG GROUP USA INC KK0203 is a clear, high-temperature silicone sealant formulated for sealing and bonding applications where heat resistance is required. Dispensed from a standard 10.3 oz cartridge, it resists continuous temperatures up to 450 degrees Fahrenheit (232 degrees Celsius), making it suitable for use around stoves, fireplaces, furnace flue connections, and similar high-heat installations. The sealant adheres to clean metal, glass, most types of wood, ceramic, plastic, brick, and slate. It touches dry within 30 minutes and reaches full cure in 24 hours. HVAC technicians, hearth installers, and plumbers reach for this product when a flexible, heat-rated seal is needed at joints and penetrations.

This sealant is used in residential and light commercial settings wherever a durable, heat-resistant seal is required. Common applications include sealing around fireplace inserts, wood stove door gaskets, furnace flue pipe joints, and hearth surround installations. Its ability to bond to multiple substrate types makes it a practical choice for mixed-material assemblies common in stove and fireplace rough-ins. It is also used by HVAC technicians to seal gaps at vent connections and metal collar penetrations where standard caulks would fail under elevated temperatures.

Key Features

• Resists continuous temperatures up to 450 degrees Fahrenheit (232 degrees Celsius)
• Clear finish blends with most substrates and does not discolor visible joints
• Adheres to clean metal, glass, most types of wood, ceramic, plastic, brick, and slate
• Dry to touch in approximately 30 minutes under normal conditions
• Fully cures in 24 hours for service-ready performance
• Standard 10.3 oz cartridge fits common caulk guns used in the trade

Compatibility

Designed for use on clean metal, glass, most types of wood, ceramic, plastic, brick, and slate surfaces in high-temperature stove, fireplace, and HVAC vent applications.

Installation Notes

This sealant is typically applied by HVAC technicians, hearth installers, or plumbers using a standard caulk gun. Surfaces must be clean, dry, and free of grease, dust, and old sealant before application. Allow full 24-hour cure time before exposing the joint to heat or moisture. Follow local mechanical and building codes for approved sealant use at flue and vent connections.