Fiber boaed problem

[Bill Grix]

Hello
I have a problem and was wondering if anyelse has dealt with this. I have been kilnforming float glass on fiber designs my base is LDfiberboard. I have be doing this for about a year on this LDF. just recently the fiber board has started to stick in small places to the float glass I am processing
I resrayed the fiber board with Colloidel Silica thinking perhaps it was breaking down after over time. this last batch of float that I fired has large pieces of the fiber board stuck to it. I am wondering if the batch of float glass I am firing might be the problem or could it be something else.
Any body else encountered this problem. '
Thanks Bill

[twins]

Hmmmm! Have you put the tin side of the float glass down against the fiber board to act as a rezist. I am sure you are because you have been havinh success up till know, BUT I just thought I would ask anyways.

[Bert Weiss]

Hmmmm! Have you put the tin side of the float glass down against the fiber board to act as a rezist. I am sure you are because you have been havinh success up till know, BUT I just thought I would ask anyways.

I know of 2 factors, one is temperature. The hotter you go, the more it sticks. The coolest temp I know that works well is 1365ºF. The other is that tin side sticks less. If the problem persists, you can kiln wash or coat with alumina powder.

Bert

[Bill Grix]

Thanks for the reply
I tend to think now it might be temp. I had been firing 16 sheets about 36" x 49"x 3/8" @ 1435 degrees with no problems. this job I am working on now I am firing 1/2"thick and the size is 38" x 68". I think the added thickness and size might be holding more heat, and causing the sticking. The odd thing is I have been doing this sort of thing for years with the same firing progams and never had this happen. will see what happens

Bill