Tag Archives: kiln pressed glass

Success with the Kiln-Pressed Glass Technique!

In my last post, the first of the year, I promised to do and THEN talk about it.  After several months of home renovation which put both my in-home studio space AND my garage workshop (and ME) out of commission I am FINALLY putting the pieces back together .  So without further ado I bring you —  drum roll please:

Finished Bowl

This 10″ diameter, vibrant bowl was created using the “Kiln Pressed Glass” technique generously shared online at http://www.fusedglass.org.  This multi-step, high temperature process is decidedly NOT for the faint of heart but the results are rewarding.  To my knowledge there is no other way to get this watercolor effect in kiln-formed glass.  For kindred spirits interested in process a picture(s) is worth a thousand words…

DAY 1: First comes the cutting and the weighing.

Assembly on 5.75 inch clear base

After cleaning the glass bits they’re set up in the kiln. Diameter starts at less than 6 inches:

Layup in Kiln 1st Firing

And here’s the “pressed” part: loads of weights are stacked ON TOP OF THE GLASS.  Yes, what you see above is indeed UNDER this:

Under Weights 1st Firing

With breath held and fingers crossed, the lid is closed and the firing cycle is programmed. Target temp is 1500 degrees with a lengthy hold.  Entire cycle lasts nearly 24 hours.  The result is over 8 inches in diameter, nearly 3 inches larger than the start:

After 1st FiringBut wait, there’s more…

DAY 2:  After soaking to remove stuck on kiln wash, coldworking both surfaces with diamond hand laps then re-coating the kiln shelves and curing those (WHEW!) comes more glass cutting, cleaning and weighing (see step one) and THEN…

DAY 2 1/2:  back in the kiln with the additional glass for the second firing:

Layup in Kiln 2nd Firing

It, too, is completely covered with loads of weights:

Under Weights 2nd Firing

The next day…

After 2nd Firing

The piece that started at somewhere between 5 1/2″ – 5 3/4″ is now 10 1/2″D with an overall thickness averaging just under 1/4″ according to my trusty calipers.

DAY 3:  Next the piece went back into the kiln for a “Fire Polishing”: a lower temp and less lengthy process but basically adds a work day to the project.  This provided a glossy top surface and a satin bottom (see pics at end).

DAY 4:  Time to slump.  The piece was centered and leveled on a bowl mold inside the Jen-Ken fiber kiln.  Now when riding my motorcycle I endeavor to keep the shiny side up.  But in this case I decided to go shiny side down and satin finish up top:

Leveled on Slump Mold

DAY 5:  Here’s what I got when I opened the kiln:

After Bowl Slump

And here are alternate snapshots of the finished piece which hopefully show at least a little the glossy exterior vs. satin interior finishes I achieved:

Finished Bowl on Stand_Glossy Exterior_Satin Interior14 Finished Bowl Satin Interior REDUCED

I am thrilled with the results and can’t wait to see how this technique will figure into my craft as a whole. Thanks for reading and stay tuned, Cube’sters!



“Pressed” for time :-)

Snapshot_20130724_14Hey Cube’sters!  Here’s an experimental piece I made using a fairly new technique from http://www.fusedglass.org called Kiln Pressed Glass. The goals are:  1)  to have the colors stacked without letting them mix up, 2) to have them spread like watercolors and, 3) all this without the piece becoming thick.  The light refraction is beautiful, like a kaleidoscope!  I’m such a metal head and any color not metal related doesn’t come naturally to me.  So, of course, I gotta master it, right?  🙂  This one took two full fuse firings up to 1500°F and held for – wait for it, ‘cuz I had to – one and a half hours!  The annealing (holding at app. 900 degrees to ensure stability/longevity of the piece) took two full hours.  The indention around my nose occurred because I didn’t plan my glass volume carefully enough on the 2nd run: the glass flowed around the fiber blanket squares used as a vertical spacer UNDER the kiln shelf which was on TOP of the glass which had a metric ton (well, not literally, but almost) of other kiln posts, bricks, shelves, etc on top of that; hence the “press” in the title. Plenty nerve-wracking.  Sorry I don’t have photos of the stack; maybe next time. The first firing looked like this after I opened the kiln and removed all the weights that were stacked on top:

1st attempt-1st firing-side view

Then I added more colored and clear glass pieces, stacked it up with tons of weight on top and repeated the process. This time I used as many colors as I had on hand for testing purposes.  I’m looking forward to other projects with planned color and pattern schemes to incorporate into mixed media works.  Stay tuned…