Lynn Manufacturing Insulating Fire Brick, Heat Insulation Block, Low Thermal Conductivity, 1.25" x 4.5" x 9" Split, Pack of 2, 2300-F Rated, for Kilns, Forges, Furnaces, Soldering, 3143R

just what needed for my waste oil furnace. came quickly too.

The bricks work great, but a couple were broken in half from shipment. They were well packaged, however, you can't completely protect them from careless delivery people who toss packages. They still function for my purposes.

Exactly what was needed for replacement. Improved packaging, came through the mail with no breaks

Buying in sets of 4. Fill whole table surface.

Good quality

Works real good in my Forge

Very easy to work with. I had to shape them and worked great

Cannot use the product because of the disgusting contamination. Really not up to the lowest standards. I need to know exactly what the contamination was so I can inform my doctors since I breathed some of it in when it puffed out of the package.

Very disappointed with the quality and even the big box stores were selling similar products. I paid $60+ for 4 bricks that could crumble. I was able to find a real firebrick for $3.50 a piece that was about 7 lbs a piece and would withstand 3200F. Glad Amazon did a quick refund; I was very unhappy with this product.