Is this basically equivalent a firebrick once dried?

Don't know the answer in a scientific way, but I've used it 3 times, over the last 6 years, to repair old fire brick in a manufactured fireplace (worked great) and a broken Chimera. It works. I've had to redo the Chimera a couple of times, but no repair lasts forever, and I believe it works super, and will buy it again. Nothing lasts forever.

I want to use this to plug gaps between the wall and the painted fireplace where some ants are entering. Is this the right stuff?

This product is great for repairing cracks and holes inside the actual fire box. Probably better products to use on the exterior of a fireplace near the wall.

Can you use this to repair crack in clay chiminea?

Sorry, I am not qualified to answer your question...What I used it for, was the stone flooring of my fire place showed small fracture lines..?.As, you are aware to fill in those cracks....You needed to use some form of cement puddy with the added feature of holding high temperatures...Which it did magnificently.

What is the difference between the mortar and cement products?

Rutland's Mortars are smooth-bodied and so are perfect for tuck-pointing or repairing mortar between bricks. Our cements are mostly thicker and have larger pebbles or aggregate in them to strengthen the application. Most all of Rutland cements and mortars are rated above 2,000-F.

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Description

🔥 Seal the heat, own the hearth!

FIREPROOF STRENGTH - Rated to endure extreme heat up to 2000°F, ensuring lasting fireplace repairs.
COLOR MATCHED FINISH - Choose from Gray, Buff, or Black to seamlessly blend with your existing firebrick.
ROCK HARD DURABILITY - Cures rock solid after heat exposure, bonding firebricks as strong as the original.
PRECISION APPLICATION - Convenient 10.3 oz cartridge designed for smooth, mess-free mortar repointing.
PROFESSIONAL GRADE SAFETY - Meets ASTM E136 and E72 standards for reliable, interior fireplace use.

Rutland Fireplace Mortar Cartridge is a professional-grade, heat-resistant mortar paste designed for repairing and bonding firebricks inside fireplaces. Available in three colors, it cures rock hard after heat exposure, withstands temperatures up to 2000°F, and comes in an easy-to-use 10.3-ounce cartridge for precise application. Ideal for interior fireplace maintenance, it meets rigorous ASTM safety standards.

Specifications

Brand	RUTLAND PRODUCTS
Specific Uses For Product	Fireplace Repair
Material	Volcanic rock
Item Form	Paste
Special Feature	Strong
Colour	Gray,Grey
Item Package Quantity	1
Package Information	Cartridge
Item Volume	10.3 Fluid Ounces
Viscosity	Medium
Full Cure Time	7 Days
Water Resistance Level	Not Water Resistant
Net Quantity	10.3 Grams
UPC	022624007630
Number of Pieces	1
Global Trade Identification Number	00022624007630
Manufacturer	Rutland Products
Model number	63G
Number of Memory Sticks	1
Item Weight	544 g
Product Dimensions	4.76 x 4.76 x 28.58 cm; 544.31 g
Item model number	63G
Item Height	11.25 Inches
Item Width	1.88 Inches
Included Components	10.3-Ounce, Gray - 63G
Are batteries included?	No

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