Can i put this below the bricks of an oven as insulation?

I understand your question, you're probably concerned that the HARD non insulatory fire brick might become to hot on whatever your forge is sitting on, (or you just want to capture and hold the heat from the heat source and bottom firebrick acting as a heatsink) No difference that when you go camping, you don't sleep on bare dirt, but on insulation like a sleeping bag mat. -But there's lots of factors like what properties does your forge floor have to begin with. Caesar gave you good info, let me just add to what he said about the insulation board being brittle, he's correct, my forge sits on a 24" x 12" inch insulating board, with a sheet metal cover over the insulation board, this is to protect the forge from chafing against the softer insulation board, both the board and sheet metal cover are firmly mechanically connected to the forge stand, no damage can happen and I hold more heat tover not using an insulating base.

If I cut off a piece, could I lay a stick of Japanese incense on it so the incense burns all the way?

Probably, is got a semi rough surface so it should allow it to burn and the temp wont hurt it but it's not aesthetically pleasing or durable for handling daily

Would this work as an annealing surface using a propane torch?

I wouldn't suggest it. It would work but It's very soft and brittle so it might not last long. It could work well if using a carbon plate on top of this to limit wear.

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BXI Inorganic Ceramic Fiber Thermal Insulation Board(2732F) - 12'' X 8'' X 0.8'', Pack of 1 - High Density - Flame Retardant, Heat Resistant, High Temperature Insulation

BXI Inorganic Ceramic Fiber Thermal Insulation Board(2732F) - 12'' X 8'' X 0.8'', Pack of 1 - High Density - Flame Retardant, Heat Resistant, High Temperature Insulation

Product ID: 156191649

Details

Brand
BXI
Item Thickness
0.8 inches
Material
Ceramic
Product Dimensions
12"L x 8"W

🔥Max temp 2732°F

🧱High density 600kg/m³

🛡️Class A1 fire resistant

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Description

🔥 Stay cool under pressure with BXI’s ultimate heat shield!

CERTIFIED FIRE SAFETY - Class A1 flame retardant rating ensures top-tier protection and peace of mind.
SMOKE FREE ODORLESS - 100% inorganic fiber means no toxic fumes or unpleasant smells — perfect for indoor professional use.
UNMATCHED HEAT ENDURANCE - Withstands scorching temperatures up to 2732°F (1500°C) — built for the hottest challenges.
PREMIUM HIGH DENSITY BUILD - 600kg/m³ aluminosilicate composition delivers superior rigidity and insulation efficiency.
VERSATILE INDUSTRIAL STRENGTH - Ideal for furnaces, kilns, forges, welding, and more — your go-to thermal shield for every high-temp project.

The BXI Inorganic Ceramic Fiber Thermal Insulation Board is a high-density, aluminosilicate-based insulation panel designed for extreme heat resistance up to 2732°F. Rated Class A1 fire resistant and smoke-free, it offers superior thermal performance and durability for professional-grade applications including furnaces, kilns, and welding setups.

Specifications

ASIN	B07TG9H8DZ
Brand Name	BXI
Coverage	0.67 square_feet
Customer Reviews	4.4 4.4 out of 5 stars (454)
Item Dimensions L x W	12"L x 8"W
Item Thickness	0.8 inches
Manufacturer	BXI
Manufacturer Part Number	BX-FireBoard-2CM
Material Type	Ceramic
Model Number	BX-FireBoard-2CM
Number of Items	1
Recommended Uses For Product	Heat shields and thermal insulation for various heating treatment equipments, fireplaces, boiler walls, blacksmith forges, welding, glass blowing, and other high temperature applications.
UPC	681381972294

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R804

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