Bottle slumping without a kiln?

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Original Post

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 2:23pm May 7, 2010 EDT


DGehman says

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 5:07pm May 7, 2010 EDT

If you don't want to invest in a kiln, you can contact a local glass shop. Usually they will fire projects for you for a fee.

Posted at 6:22pm May 7, 2010 EDT

Thank you for the understanding on why a kiln is best. I might have to look into one if we decide it works and we want to make more.

And, ohana, I don't know of one but I will look.

Posted at 7:06pm May 7, 2010 EDT

purplmama says

Marking... this is why I LOVE the forums!!! Everyone knows sooo much.. : )

Posted at 7:17pm May 7, 2010 EDT