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I gave up and ordered new kiln shelves and now need to do something with the 2 ruined ones. They have glaze embedded in them in several places, but parts of them are okay. If I want to use pieces of them as supports for pots in future glaze firings, how do I break them in pieces?  

If I decide to just throw them out, should they just go in the trash?? 

My husband doesn't want them for stepping stones...any other uses?

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A hammer works well. Wear safety glasses and cover the shelf with a towel to contain shards. The smaller (2") pieces are also good for adding height to posts between shelves. 

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break up the shelves and use the clean areas as nerds to stack on top of your 3 posts to add 1/2 inch when needed . This can save space in most kiln loads.

I keep and use 3 different thicknesses of these Brocken pieces. mine are washed as at higher temps than can fuse to post.

Edited by Mark C.

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If you have a tile saw you can cut it up, you may have one half that you can use.   When I bought my little test kiln the shelf kit with it was quite expensive.  I bought a rectangular shelf at my local ceramics store and cut it into the 6x6 shelve I needed for the kiln.  I ended up with more shelves than the kit at a third the cost.   Denice

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Use an angle grinder to score an 1/8" - 1/4" deep groove in the shelf. Do this on both sides with the grooves opposing each other. Place the shelf on a 2x4 with the part you are cutting off overhanging the edge of the 2x4. Place another 2x4 on top of the shelf on the part you are cutting off, very near the groove. Smack the 2x4 with a hammer. 

The shelf should break along the score line.

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