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Rigidizing fibreboard

Posted: Sat Feb 04, 2023 4:18 pm
by Michelle Schouten
I’ve rigidized, fired and cemented a fibreboard in an effort to make a new kiln shelf for my 2417 Evenheat. Does anyone know what temp Celsius I need to fire the cemented fibreboard? I used QF 180 blue as the cement.
Thanks in anticipation

Re: Rigidizing fibreboard

Posted: Tue Feb 07, 2023 6:52 pm
by Kevin Midgley
to whatever burns the binders off. Depends on time and temperature etc. The binder is usually sugar in my experience.

Re: Rigidizing fibreboard

Posted: Tue Feb 07, 2023 9:52 pm
by Brad Walker
650 C should do it, but it wouldn't hurt to go to 800 C.

Re: Rigidizing fibreboard

Posted: Thu Feb 09, 2023 12:22 pm
by Kevin Midgley
I thought you were not to take boards and blankets to too high a temperature in burnout because of the risks of creating crystobalite. That is why the non specific temperature I posted. It depends hugely on the amount of binder used in the particular material. I once used some building a kiln and burned it out with so much smoke production I figured someone would call the fire department. The supplier apologized.

Re: Rigidizing fibreboard

Posted: Thu Feb 16, 2023 8:44 pm
by Michelle Schouten
Thanks guys. I went to 820 C before seeing the replies. The blue cement has turned white and all seems good. I now have a new, flat, bigger shelf on top of the old one.
Kevin, what is crystobalite?