Bottle slumping without a kiln?
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We want to slump a few small (2-4 oz) bottles for a project. I've never seen them sold this small, and need them to be "supply priced" not "finished product priced" anyway. Does anyone know of a way to slump without a kiln that would work for very small bottles?
Posted at 2:23 pm May 7, 2010 EDT
Glass has a bad habit of shattering when it's heated unevenly, too quickly or when it's cooled too quickly.
Unless it's borosilicate glass (Pyrex, some laboratory glassware). Trouble is, borosilicate melts at 820 C / 1500 F., white hot.
Or, you have a heck of a lot of experience in large lampwork glass pieces. Use heavy leather outer gear plus welder's helmet...
Kilns offer two protections against shattering, which can send hot shards dozens of feet. First, a good kiln heats evenly. Second, the kiln envelope contains the shards in the event of shattering.
So, I strongly suggest you buy a glass slumping kiln...
Or, if you're adventurous, you can probably build a kiln from a 8-12 soft ("insulating") fire brick + propane weed burner. Google on "DIY raku kiln weed burner." (Raku is a type of low-fired pottery that is fired very rapidly.)
You'll still want protective gear. Google for protective clothing for blacksmiths... but don't get short Kevlar gloves - you want long ones.
Posted at 5:07 pm May 7, 2010 EDT