Gaffer® Casting Crystal Annealing Schedules. Semi-Open
and Open Forms *
Thickness
(inches)
(mm) |
Anneal
Soak Time
@ 806oF
@ 430oC |
Initial
Cooling Rate
oF/Hr
oC/Hr |
Initial
Cooling Range
oF
oC |
Second
Cooling Rate
oF/Hr
oC/Hr |
Second
Cooling Range
oF
oC |
Final
Cooling Rate**
oF/Hr
oC/Hr |
Final
Cooling Range
oF
oC |
Total
Elapsed Time |
0.5 in
12 mm |
2 hr |
120
67 |
806 - 680
430 - 360 |
240
133 |
680 - 590
360 - 310 |
720
402 |
590 - 70
310 - 21 |
4hrs 10mins |
0.75 in
19 mm |
3 hr |
52
29 |
806 - 680
430 - 360 |
104
58 |
680 - 590
360 - 310 |
312
174 |
590 - 70
310 - 21 |
8hrs |
1.0 in
25 mm |
4 hr |
29
16 |
806 - 680
430 - 360 |
58
32 |
680 - 590
360 - 310 |
174
96 |
590 - 70
310 - 21 |
13hrs |
1.5 in
38 mm |
6 hr |
13
7.2 |
806 - 680
430 - 360 |
26
14.4 |
680 - 590
360 - 310 |
78.0
43.0 |
590 - 70
310 - 21 |
26hrs |
2.0 in
50 mm |
8 hr |
7.8
4.3 |
806 - 680
430 - 360 |
15.6
8.6 |
680 - 590
360 - 310 |
46.8
25.8 |
590 - 70
310 - 21 |
41hrs 30mins |
2.5 in
60 mm |
10 hr |
5.2
2.9 |
806 - 644
430 - 360 |
10.4
5.8 |
680 - 590
360 - 310 |
31.2
17.4 |
590 - 70
310 - 21 |
2 days 13hrs |
3.0 in
75 mm |
12 hr |
3.3
1.8 |
806 - 644
430 - 340 |
6.6
3.6 |
644 - 554
340 - 290 |
19.8
10.8 |
554 - 70
290 - 21 |
4 days 5hrs |
3.5 in
88 mm |
14 hr |
2.5
1.4 |
806 - 644
430 - 340 |
5.0
2.8 |
644 - 554
340 - 290 |
15.0
8.4 |
554 - 70
290 - 21 |
5 days 12hrs |
4.0 in
100 mm |
16 hr |
1.8
1.0 |
806 - 644
430 - 340 |
3.6
2.0 |
644 - 554
340 - 290 |
10.8
6.0 |
554 - 70
290 - 21 |
7 days 8hrs |
4.5 in
113 mm |
18 hr |
1.6
0.9 |
806 - 644
430 - 340 |
3.2
1.8 |
644 - 554
340 - 290 |
9.6
5.4 |
554 - 70
290 - 21 |
8 days 5hrs |
5.0 in
125 mm |
20 hr |
1.3
0.7 |
806 - 644
430 - 340 |
2.6
1.4 |
644 - 554
340 - 290 |
7.8
4.2 |
554 - 70
290 - 21 |
10 days 9hrs |
5.5 in
138 mm |
22 hr |
1.1
0.6 |
830 - 644
430 - 340 |
2.2
1.2 |
644 - 554
340 - 290 |
6.6
3.6 |
554 - 70
290 - 21 |
11 days 20hrs |
6.0 in
150 mm |
24 hr |
0.9
0.5 |
806 - 608
430 - 320 |
1.8
1.0 |
608 - 518
320 - 270 |
5.4
3.0 |
518 - 70
270 - 21 |
16 days |
6.5 in
165 mm |
26 hr |
0.7
0.4 |
806 - 608
430 - 320 |
1.4
0.8 |
608 - 518
320 - 270 |
4.2
2.4 |
518 - 70
270 - 21 |
19 days 20hrs |
7.0 in
175 mm |
28 hr |
0.6
0.33 |
806 - 608
430 - 320 |
1.2
0.66 |
608 - 518
320 - 270 |
3.6
2.0 |
518 - 70
270 - 21 |
23 days 19hrs |
7.5 in
190 mm |
30 hr |
0.5
0.3 |
806 - 608
430 - 320 |
1.0
0.6 |
608 - 518
320 - 270 |
3.0
1.8 |
518 - 70
270 - 21 |
26 days 6hrs |
8.0 in
200 mm |
32 hr |
0.47
0.26 |
806 - 608
430 - 320 |
0.94
0.52 |
608 - 518
320 - 270 |
2.8
1.56 |
518 - 70
270 - 21 |
30 days 4hrs |
8.5 in
215 mm |
34 hr |
0.41
0.23 |
806 - 608
430 - 320 |
0.8
0.46 |
608 - 518
320 - 270 |
2.4
1.4 |
518 - 70
270 - 21 |
33 days 21hrs |
9.0 in
225 mm |
36 hr |
0.35
0.2 |
806 - 608
430 - 320 |
0.7
0.4 |
608 - 518
320 - 270 |
2.1
1.2 |
518 - 70
270 - 21 |
38 days 22hrs |
9.5 in
242 mm |
38 hr |
0.32
0.18 |
806 - 608
430 - 320 |
0.64
0.36 |
608 - 518
320 - 270 |
1.9
1.1 |
518 - 70
270 - 21 |
42 days 6hrs |
10.0 in
254 mm |
40 hr |
0.29
0.16 |
806 - 608
430 - 320 |
0.58
0.32 |
608 - 518
320 - 270 |
1.74
0.96 |
518 - 70
270 - 21 |
47 days 15hrs |
* Based on: Schedules for commercial annealing of ordinary
ware. Corning Glassworks. Corning N.Y. 1950. For forms that are able
to cool reasonably equally on all sides.
** Obviously cooling rates of thinner pieces are faster than ordinary
kilns would lose heat. In those cases the kiln can be allowed to cool
at its normal rate.
Revised schedules August 2010.
Gaffer® Annealing Schedule Notes
Copyright: Gaffer® Coloured Glass Ltd. 2010.
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