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Black Fireplace Mortar

Not for exterior use. Apply 1/16 - 1/8" thick!

10.3 Fluid Ounce Black Fireplace Mortar

List price: $15.99  
Price in points: 1399 points
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Keep your indoor fireplace or insert in tip-top shape with A.W. Perkins Fireplace Mortar! It's perfect for filling in those little holes, cracks, and imperfections that tend to occur between the bricks on your fireplace. (We recommend using this mortar only on areas 1/8" or smaller.) 

This black mortar can be fired immediately after application! Once properly cured at 1200°F, it will withstand temperatures up to 2000°F! Another great thing about this product is that it will be as hard as the surrounding firebrick, giving you to complete assurance that this is a quality product that is made to last.

Remember to check out our Silicone & Caulking Tips below to see if we have any suggestions to help make your DIY project easier. If you have any questions, we’re happy to help! Give Fast Replacement Glass a call at 1-888-986-1535.

  • To use:

    • Burn a low fire to dry the fireplace mortar.

    • Heat under extreme heat to cure.

    • This mortar is rated for indoor use only. 
    • For large repairs (exceeding 1/8" areas), a castable refractory cement is highly recommended.
Size: 10.3 fl oz cartridge
Color: Black
Temperature Rating: 2000°F (1093°C)
Features & Benefits:
  • Meets ASTM E-136 and E72 non-combustability standards.
  • Versatile enough to patch firebricks or repair masonry on areas 1/8" or smaller.
  • Covers up to 99 feet - can be painted once fully cured!


How to caulk like  pro!Silicone & Caulking Tips: DiY like a Pro!

  1. Product cartridge fits into a standard caulking gun. For clean application, cut the cartridge tip near the end, at an approximate 45° angle.
  2. Ensure that the working surface is clean, dry, and free of debris. Have some damp cloths or a roll of paper towels within reach. Lay down newspaper to protect carpet/flooring from possible drips.
  3. To lay a professional bead, hold the caulking gun at 45°. Spin the cartridge tube so the longest part of your tip is aligned with the top side of the caulking gun.
  4. Beginning at the highest point of your working area, slowly and gently squeeze the trigger and drag the gun to lay an even bead (about 1/8"). 
  5. For a clean job, remember that "A little goes a long way!" Try to be consistent when laying a bead - you can always go back and add more material later.
  6. As you near the end of the working area, release the trigger (or press the release lever) to stop the flow of material.
  7. After applying the material, let it cure for the indicated amount of time (at room temperature) before using your appliance.



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Last updated on August 23rd 2017.