troubles testing new kiln

[mikefromitaly]

Hello people.

I changed fiber board on bottom of the kiln and during new tests wtih 6mm float glass i got big bubbles....
can anyone explein what it happened ? thank you in advance

mike

[Bert Weiss]

The first time you fire a board, there are organics in the binders that burn out. These will stink and create gasses.

[mikefromitaly]

thank you. so what to do ?

[Rick Wilton]

At this point nothing, try again and it's likely resolved its self.

Once you've fired the kiln to fusing temps the organics should have all burned out and you shouldn't have any more issues. Was there smoke and a burnt sugar like smell coming out of the kiln the first time you fired with the new fibre?

[Bert Weiss]

Boards are not exactly flat. WIth a shelf, if there is a dip in the shelf, it can trap air which can blow that sort of bubble. There are a few solutions. You can put a piece of fiber paper beneath the glass. This will allow the air to escape. You can work on a thin sandbed. You can fill and sand the board. Or you can replace the shelf with a flatter one.