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The only possible thing I can see is that they might bend sooner; but why go through the extra cost and time to bisque them unless your wanting to do a super fast firing. If that's the case, an alternative might be to use the self supporting cones.
Not good. They measure heat work and you are adding heatwork. I have a soft brick I carve a triangle to seat the cones and then they are resuable and don't blow up.
Just happened to come across this post on clayart a couple days ago. Sounds like there are multiple issues with pre-firing cone packs. Here is the part of the post: "One of my students thought he had a great idea. He made a supply of cone packs and bisque fired them in the test kiln to cone 018. Sounds like a good idea, huh? But they came out of the firing with the binder burned out of the cones so that they were extremely brittle and crumbled when handled.- VinceVince PitelkaAppalachian Center for Craft"
Instead of speculating, run a test. JB's heat-work caveat might not have lot of effect in your situation. Although since bisque firings tend to be slow risers, it might. Why not test it out? Your findings would be interesting.Another solution is to make a bunch of cone plaques and let them dry out over time.
Thanks, peeps. Now I know. I poked a million holes in each cone pack, so they shouldn't blow up. I just thought since I was running a bisque anyway and the cone packs were bone dry, why not? Thanks for the answer to "why not." 1500th Clay Club post!
What's wrong with self-supporting cones?
Self supporting cones will melt all over the kiln shelf and cost more.
I have been putting cone packs for the wood kiln in a bique at cone 04. I know that Ihave lots of heat and flame in the front of my wood kiln and do not want to blown a cone pack up. I have blown up cone packs 2 times ,what a hassle
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