Challenging projects demand the best quality products. For occasions when you need a really tough, yet elastic seal we recommend Rutland High-Temperature RTV Black Silicone Sealant. Its chemical resistance and ability to remain flexible when exposed to 550 degrees fahrenheit temperatures make this sealant ideal for jobs like sealing chimney tops, pellet stoves, and gas fireplace inserts. A neutral, odor-free formula also makes this hearth maintenance product a good choice for applications in confined areas with little air flow.
Can be used in almost any situation where a permanent, elastic rubbery seal is required
Remains continuously flexible a 550º F and intermittently flexible at 600º F for one hour
Adheres to glass, metal, plastic, fiberglass, aluminum, wood, brick, and slate
Cures without heat
Free of unpleasant odors
Won't corrode copper or galvanized metals
Outstanding chemical resistance
Meets or exceeds Fed. Spec. TTS-001543C Class A, TTS-00230C Class A, and ASTM C920-86
The refractory panel in the back of my fireplace is cracked as well as the base. Can this product be used to fix these cracks?
By eFireplaceStore on October 9, 2014
This sealant will not work well for your purpose. Instead, the Rutland Masonry Fireplace Patch - 1.5 Pound Tub should be used. Please keep in mind that this will only be a temporary fix, as the panels will likely continue to degrade and will eventually require complete replacement.
By Ed Simon from Maryland on January 23, 2012
I need to caulk around my fireplace doors. The mortar keeps falling out. The gap between the metal door and the limestone is about a 1/4". Will this product work and does it come in different colors? The limestone is a sand color.
I believe the metal door expands and cracks the mortar joint so something flexible like high temp caulk may work.
By Kevin E. - Fireplace Specialist on January 24, 2012
For a gap this large, a gasket and cement combination may be a better solution. The gasket material will work to fill the gap and the cement will absorb the flex of the door kit. Please follow the below links to view these products.
By Albert from Flower Mound, TX on September 23, 2013
Will this work for an exterior fireplace against metal and masonry?
By Collin C. - NFI Master Hearth Professional on September 24, 2013
This product can indeed be used to seal exterior joints, as long as they are not exposed to a temperature greater than 550 degrees. This RTV sealant can indeed be used to bridge masonry to metal joints.
By Fred from Vermont on October 4, 2013
How long does this sealant take to cure, and how soon after a stove is rebuilt can we start to burn wood?
By Collin C. - NFI Master Hearth Professional on October 4, 2013
This item takes approximately 24 hours to cure and should not be subjected to heat within the first 72 hours.