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

Product ID: 88885365

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Details

Brand
RUTLAND
Material
Clay" or
Item Weight
10.93 kg
Item Form
Tan Fire
Global Trade Identification Number

📏Precise 9" x 4.5" x 1.25" dimensions

📦Box of 6 for bulk convenience

🔥Rated to 2700°F heat resistance

Description

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

READY FOR HOME USE - Intermediate duty rating tailored for everyday residential applications.
BULK PACK EFFICIENCY - Box of 6 bricks means you’re always stocked and ready to build without delay.
TRUSTED BRAND QUALITY - Manufactured by Rutland Products, a name synonymous with durability and reliability.
PRECISION CRAFTED SIZE - Ideal 9" x 4.5" x 1.25" bricks ensure seamless installation and consistent performance.
UNMATCHED HEAT ENDURANCE - Withstands extreme temperatures up to 2700°F, perfect for your high-heat projects.

Rutland Products Fire Brick offers a reliable, intermediate-duty solution for home masonry projects, rated to withstand intense heat up to 2700°F. Each brick measures 9" x 4.5" x 1.25" and comes in a convenient box of 6, combining precision sizing with trusted durability for professional-grade results.

Specifications

UPC	012685000053 022624006046
Manufacturer	Rutland Products
Country of Origin	USA
Item model number	604
Product Dimensions	22.86 x 23.5 x 13.34 cm; 10.93 kg
ASIN	B000UEYZ4S

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