Slumping is HOT!
After enjoying a little fruit of the vine....The first thing you'll want to do is remove the label from your bottle; for stubborn ones Goo-Gone works well.
Next be sure to wash and dry your bottle completely. Moisture is the enemy. It can cause the bottle to explode in your kiln, making a very big mess.
Bottles with painted labels are ok (actually - they are trey cool ;) but I suggest using a thin sheet of fiber paper under the part where the label comes in contact with the molds surface, otherwise the bottle might get stuck and ruin your mold. YUCK! see the picture below.
Devitrification spray can be applied to the bottles to prevent a hazy or a scummy appearance on the glass after it's fired. (I don't bother with this).
If you would like to hang your bottle for decorative purposes; take a piece of 20 gage copper wire (or fine silver) shape in a U and insert it in the bottle top before slumping.
Use a clay mold that has been pre treated with glass separator. Separator should be reapplied between firings and dried completely, as needed. Check the tiny vent holes, in the mold - under the glass, to be sure that they are not plugged with the separator.
My Firing Schedule for med. to lg. bottle:
•1. 600 Degrees Per Hour to 1000 Degrees Fahrenheit, soak (hold temp constant) for 10 minutes
•2. It is only safe to peek* into the kiln from 1000 degrees and up- otherwise you will shock your glass and it will crack.
*Please protect your hands and arms with heavy kiln gloves and your face and eyes with tinted safety glasses!
•3. Heat AFAP (as fast as possible), to 1375 to 1425 DF, (depending on the size and thickness of your bottle)
•4. Soak (hold temp constant) for 5-15 minutes or until the bottle is slumped to perfection.
•5. Watch it closely during this time it can move rather fast!
•6. Allow the Kiln to cool until the temperature falls to 1000 DF.
•7. Soak for 10 minutes at 1000 DF.
•8. Annealing Stage; slow cool at 180 DPH to 800 DF.
•9. Next turn off the kiln and let it cool naturally to room temperature; don't peek*! (see #2 above)
After you remove your project from the kiln; be sure to vacuum any spall that comes off the copper wire to avoid contaminating your next project.
You may want to adjust the temperature and/or soak time according to the size and thickness of your bottle.
Practice is the best teacher and sometimes an error is the result of what will be some of your favorite pieces.
Most importantly, have Fun!
Bottles from my Kiln
Snowman Cheese Ball
Belvedere Bottle
Bottle stuck to the mold...YUCK!
Hot Glass in the Kiln
This interesting tutorial was written by:
shetrick on HubPages
While Sue Hetrick received most of her formal training in art from HACC, Central Pa’s Community College; she continues to learn from her own experimentation. Her ceramic pieces are crafted to be functional works of whimsy. The same can be said for her glass fused and slumped pieces, which tend to be her favored creations. The addition of wire wrapping make the glass pieces uniquely her own. Whether ceramic or glass, Sue crafts works of art that incorporate fun into function.
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