Recycled Glass Pot Melt Tests

One of the things about recycled glass that everyone who uses it knows is, you have to test everything.   Twice.  And then do it all over again, since your results could have been a fluke and the worst time to realize that is after you've spent a very long time on something.

So.  In preparation for some cast sculptural work that's coming up, I decided to do some potmelt (crucible) casting tests.  The factors I need to isolate are:  glass particle size, aperature size and temperature.

The most obvious way seemed to test three aperature sizes and three glass sizes at the same temperature.  This would allow me to isolate one factor at a time.

The glass I used was:  ground clear window glass larger than 16# and smaller than 1/8", ground clear window larger than 1/8", smaller than 1/4" and large chunk tempered glass.  All three were mixed with one third by weight of ground Bombay Sapphire bottle glass.

Next I used 9 terra cotta pots, all of the same size, drilled 1/2" holes in the bottom of three, 3/4" holes in the bottom of three and 1" holes in the bottom of three.  Next step; loaded one of each size with one of each glass mixture.

I set them all up in my side-fire kiln (a.k.a. the EZ bake).  Based of past experience, I knew that 1700 wasn't hot enough.  I decided to try 1850 for 15 minutes.

 

Here are the pots post firing (the bottom shelf, the remainder were on another shelf).  With the exception of that center pot, it looks like we got pretty good drainage of the crucibles.  The center pot:

This pot contained the smallest particle size (16# mesh) and the smallest aperature (1/2").  This is very useful, because it gives me a baseline for the bottom end of the success spectrum.

The next step is to look at the resulting melts and see which other combination would suit our purposes the best.

 

This is the smallest particle size (16#) through the 3/4" aperature.  The result is shiny and smooth, but not translucent.

Med size (>16# <1/8") clear through the 3/4" aperature.   The results are very shiny, with some translucency.

Large chunk (~1/2") tempered glass through the 3/4" aperature.  Very translucent and shiny.  

So, the conclusion here is that we need to use about a 3/4" aperature or larger.  Any of the glass particle sizes will work with that aperature, but each gives a very different result.  Next step in the casting process is mold making and further temperature refinement based on increased quantity of glass.

Eeeew and yet fascinating.

I volunteer regularly at an elementary school and the teacher did an experiment that so fascinated and revolted me that I wanted to share. (I'm generous that way.)

Kirsten (the teacher) had all of the 1st/2nd graders sit in a circle and we had a long discussion about germs. These kids know a lot about germs and bacteria already, I was impressed. Then Kirsten passed around a peeled potato half and had the kids rub their hands all over it. I have to confess by the time it got to me I COULD NOT touch it, it was already so disgusting.

Then, the kids all washed their hands as prescribed by the health department. It took forever.

We all came back to the circle and Kirsten passed around the other half of the peeled potato and the kids rubbed their hands all over it again.

Here are the two potato's after 1 week.









My hands are cracked from so much washing with anti-bacterial soap since then.

Avenue's Street Fair

Last weekend I spent the day at the Avenue's Street Festival. It was so much fun! People I hadn't seen for years were there so I got to hang out with great folks.

Next weekend I will be at the 9th and 9th Street Festival, 9th S. and 9th East from 10 a.m. to 6 p.m.

If you're around, stop by and say hi. I have delicious stuff in the kiln right now that will make it's debut this weekend.

Recycled Glass Wave

Here is another photo of the recycled glass wave. This project is the brain child of Chris St. Jeor, if you'd like to see the surfer that will go with this wave, look here:

Everybody do the wave!

I've been working with sculptor Chris St. Jeor for the last couple of months to create a glass wave. Chris wants to combine the glass wave with his stone and steel sculptures. We took this wave out of the kiln this morning. We will have better photography after some cold working, but for now, this is so exciting I had to share.

This is version 5, cast with a combination of clear and turquoise frit (recycled window and Bombay Sapphire Gin bottles). We are looking forward to version 6 over the weekend. Stay turned!

Lightening Bolt Man

That's his super hero name, his secret identity is Erik Morgan (oops!). Erik came and spent a few days in my shop seeing how it's done. He also made this great bowl all by himself from start to finish, including the block printing. Considering that his very first glass cutting was a circle, he get's an A+!

New work finished June 27th

Fresh baked and hot from the oven, these pieces will be at Farmer's Market on July 11th. (unless someone snatches them up first). The pieces that come home from Farmer's Market will go online.

The long, modern orange and brown one is very cool. It's tucked in at the far end next to a small oval with dots (and it's upside down). Come check it out.

What's in the Oven

These pretty pieces finished fusing this morning. Tune in tomorrow to see the finished pieces. My favorite so far is the orange and brown asymmetrical piece on the lower right (second photo). All of these pieces were made with glass from the Utah Museum of Natural History. The glass is from defunct display cases and is about 35 years old. (estimated, of course)

Girl Scouts - Not just for cookies!

I had the pleasure of visiting with a very bright group of girls in my studio on June 10. Their troop was visiting with various types of entrepreneurs, one of which was me.

Despite the pouring rain, which severely limited our ability to break stuff, I think they had a good time.

And the cookies were GREAT!!