This brick is 4" x 9" and 2.5" thick. Lightweight, soft insulating bricks are great for torchwork such as firing PMC or Fusing fine silver wire. Soft brick can easily be cut without special saws or tools.
Kiln Brick Vs. Charcoal Block
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Works well for soldering. Tried having it under my trivet during torch enameling but found that sometimes I ended up with little white pellets from the brick in my enamel.
Seems like a very good kiln brick! I've used it several times with great success.