Dear all,
Having the same glaze putting into two different kilns - one is km 714 by skutt, and another is Falcon FL3.120, the ones put into Falcon FL3.120 turns out with speckle. I wonder if it matters with the last firing rate above 1000c till my end temp (1222c).
When using km714, I firing with cone 6 medium firing. When using Falcon FL3.120, I'm firing with the below schedule:
120c/hr - 1063c
70c/hr - 1220c
I tuned the ending temp to 1220 as it seems due to the much larger chamber of FL3.120 than km714, the pyrometric cone shows it is a little bit over-fired.
The recipe mainly having a speckled issue is as below:
NS 20.37
silica 10.74
3124 22.56
Kaolin 29.23
Whiting 17.1
iron oxide 3
manganese dioxide 1.5
Thanks all.