glass wafer problems

[Linda Hassur]

I am trying to work with the powdered wafers. I made the wafers 1 1/2 inches long and when they are fired onto two layers of glass, they shrink to 1 inch and the edges are not flat but curled up. My firing schedule for the firing onto glass was 450 dph to 1200, held 20 mins, 600 dph to 1500, held 20 mins. The glass pieces are small, 1 1/2 inches by 1 1/4 inches. I've made wafers in the past and had no problems but I can't seem to get the smaller ones to fire without shrinkage. I assume that the curled edges could be fixed with a higher firing temp but I'm stumped. Help. Thanks Linda

[Bob]

Hi Linda,

Try these two things:

1) make sure that the side of the wafer that was against the shelf in the first firing is facing up.

2) put in a soak at 1325... about 30 minutes to allow the wafer to fuse onto the upper layer before going up to full fuse

Hope these help.

Cheers,

Bob