Meeco's Red Devil Gray Furnace Cement & Fireplace Mortar, 1/2 Gallon is a premixed, versatile high-temperature silicate mortar designed for bonding and sealing both masonry and metals. It withstands working temperatures up to 2,000 degrees Fahrenheit, making it i for patching or repairing cracked or chipped firebrick and mortar. This mortar is for resetting and cementing furnaces, stoves, chimney collars, boilers, and duct work, providing a reliable and durable seal. Please note, it is not intended for exterior use. The product comes ready to use in a convenient 1/2 gallon bucket, ensuring ease of application for your high-temperature repair needs. Model Number: