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The first anniversary of my kiln is approaching.
Looking back, I tried to summarize what I have learned.

Below is a table collected from the board.
Is there anything important missing?
Is there anything you disagree with?


Critical points Critical points
C Event F
from to from to
40 240 Plaster calcinates 104 464
80 120 Moisture evaporates 176 248
223 "Chrystobalite inversion,
up=mold expands,down=shrinks" 433
510 615 Plaster bonded water released 950 1139
250 heat glass to frit in water 482
435 385 BE annealing 815 725
540 Burnout of organic mediums 1004
540 626 bending bowls w/o mold texture 1004 1159
573 "Quarz inversion,
up=mold expands down=shrinks" 1063
590 "anti-bulge soak,
to release gasses under the piece" 1094
630 660 BE slumping 1166
677 732 BE fire-polishing 1251 1350
700 and up = Devit risk for BE 1292
704 Plaster loses strength and shrinks 1299
760 and up=caolin reacts and sticks 1400
760 790 BE kilnwash starts to stick (kaolin reaction?) 1400 1454
770 Borax matures 1418
770 Float devits 1418
800 low surface tension causes bulges under the sheet 1472
820 980 flowerpot casting 1508 1796
930 1030 Bisquit firing clay molds 1706 1886

-lauri

Sorry to see how the table came out.
The columns are
Temperature in Centigrades From, To,Description, Temps in F From, to.

Hope this helps reading.
-lauri

lauri wrote:The first anniversary of my kiln is approaching.
Looking back, I tried to summarize what I have learned.

Below is a table collected from the board.
Is there anything important missing?
Is there anything you disagree with?


Critical points Critical points
C Event F
from to from to
40 240 Plaster calcinates 104 464
80 120 Moisture evaporates 176 248
223 "Chrystobalite inversion,
up=mold expands,down=shrinks" 433
510 615 Plaster bonded water released 950 1139
250 heat glass to frit in water 482
435 385 BE annealing 815 725
540 Burnout of organic mediums 1004
540 626 bending bowls w/o mold texture 1004 1159
573 "Quarz inversion,
up=mold expands down=shrinks" 1063
590 "anti-bulge soak,
to release gasses under the piece" 1094
630 660 BE slumping 1166
677 732 BE fire-polishing 1251 1350
700 and up = Devit risk for BE 1292
704 Plaster loses strength and shrinks 1299
760 and up=caolin reacts and sticks 1400
760 790 BE kilnwash starts to stick (kaolin reaction?) 1400 1454
770 Borax matures 1418
770 Float devits 1418
800 low surface tension causes bulges under the sheet 1472
820 980 flowerpot casting 1508 1796
930 1030 Bisquit firing clay molds 1706 1886

-lauri

Nice 2 C it all listed

But

Do B awair that temp is relative 2 kiln n climb / soak

U can avoid many problems with a slow climb n slump / fuze at lower temps

Lauri

For me float begins to devit around 1300ºF .

The slump figures are a bit vague to me. Do you mean that it begins to slump or that temp makes a practical slump?

Kiln wash sticks relative to the softness of the glass. Different colors and formulations behave differently relative to kiln wash.