Are these safe for food? In a grill?

you might use them in the construction of the grill, like if you're building your own yakitori grill, but I dont think you allow the food to touch or cook on the bricks

Is there any firebrick and mortar I can buy that can tolerate 3,800°F-6,000°F?

They are industrial grade firebrick these will not work for that application

measurement of the bricks. 9X4&1/2?

Yes, they measure 9" by 4.5" by 1.25". They are identical to the original fire bricks in my Vermont Castings Defiant wood stove. My stove is 9 years old.

What is the best way to join these together?

Your best bet to join these bricks would be to use a refractory mortar, such as the Rutland Fireplace Mortar. If outdoors, you will need to use the Rutland Castable Refractory Cement.

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Rutland Products Fire Brick, 6 count, Pack of 1

Product ID: 315293065

Details

Brand
Rutland
Flavour
unflavored
Item form
Tan Fire
Item weight
10.93 kg
Material
Clay" or

📏Precise 9" x 4.5" x 1.25" dimensions

📦Pack of 6 durable fire bricks

🔥Rated to 2700°F heat resistance

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11679712₫

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Sold byAmazon VietnamDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🔥 Build with fireproof confidence — don’t get left in the cold!

BULK PACK CONVENIENCE - Six bricks per pack ensure you have enough material for complete projects without constant reordering.
TRUSTED BRAND QUALITY - Rutland’s 4.7-star rated fire bricks deliver consistent performance and peace of mind.
UNMATCHED HEAT ENDURANCE - Withstands extreme temperatures up to 2700°F, perfect for your high-heat projects.
RELIABLE INTERMEDIATE DUTY - Engineered for normal home use, balancing durability and cost-effectiveness.
PERFECTLY SIZED FOR VERSATILITY - Compact 9" x 4.5" x 1.25" bricks fit seamlessly into any fireplace or kiln setup.

Rutland Products Fire Brick pack includes six high-quality clay bricks, each measuring 9" x 4.5" x 1.25" and rated to withstand temperatures up to 2700°F. Designed for intermediate duty, these fire bricks are ideal for home fireplaces, wood stoves, and kilns, offering reliable heat resistance and durability from a trusted brand with excellent customer ratings.

Specifications

ASIN	B000UEYZ4S
Best Sellers Rank	#45,100 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #26 in Firewood
Brand Name	Rutland Products
Customer Reviews	4.7 4.7 out of 5 stars (2,679)
Flavor	unflavored
Global Trade Identification Number	00022624006046
Item Form	Tan Fire Bricks
Item Type Name	Rutland Products Fire Brick
Item Weight	10.93 kg
Manufacturer	Rutland
Manufacturer Part Number	604
Material Type	Clay" or "Ceramic
Model Number	604
UPC	012685000053 022624006046
Unit Count	6 Count

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