Another great project brought to you by….the library.
We got the talk again about fused glass, tack glass, types of glass, how much glue to use, how high to stack the pieces and so on.
Then, we got creative. I think I missed Grace’s piece (which will be a key chain.) Here is mine – a brooch.
Hannah’s will be a necklace.
Bethany’s will also be a necklace.
It will take about 3 weeks to get back (he has a lot of them to do from different library days.) I chose full fuse this time, I didn’t like how the tack style looked on such a small piece last time. Grace also had full fuse and Bethany and Hannah had tack. After getting some books and library prizes we headed over to the Mercado to get some Mexican candies and drinks. Mmmmm….goat milk candy, it’s the closest place I know of to get it.
Terms we learned:
COE – coefficient of expansion is the amount the glass expands or contracts for every degree centigrade. If the expansion and contraction rates for different pieces of glass are not a very close match, internal stresses will cause the glass to fracture. In the engineering world COE is called CTE (coefficient of thermal eventually.)
Full fuse – glass that has been heated to the point where individual pieces are no longer identifiable and the surface is flat (1500 degrees.)
Slumping – the process of shaping glass by heating the glass positioned on top of a mold. Slumping temperature is about 1280-1325 for Bullseye glass.
Tack fuse – Glass heated until it just begins to melt. Pieces of glass stick together, but are easily identifiable as individual pieces. Ground or sandblasted surfaces become glossy, with edges of the glass rounded and safe to touch.