In my March 1 blog I found a way to make a stainless steel box from foil I can easily purchase at Grainger.
- 309 comes in a length of 12” x 10 foot for $87.40 and can be found at http://www.grainger.com/Grainger/Foil-Roll-4UGL1?Pid=search
- 321 comes in a length of 12” x 10 foot for $28.00 and can be found at http://www.grainger.com/Grainger/Foil-Roll-4UGL5?Pid=search
|Its still strong|
But look at the flakes. . . I didn't even notice them until they started building up on the kiln floor.
I tested a little further and fired the box at 1650degrees F for one hour. No problem. Even though the suggested maximum temperature for this foil
(321) is for 1600 degrees, it worked fine. Now, that's not to say that I recommend firing it at a hotter temperature than what the manufacture suggests. I am sure that over time it will degenerate at that temperature and intermittent heating.
The chart on the left shows that this foil is good for intermittent use up to 1600 F and 1700 F for continuous use. The difference in these two uses is attributable to the cooling down of the metal. As it cools, the metal contracts. As it heats, it expands. This process causes the scaling or wear to occur from the stress of heating and cooling - and this happens more quickly with shorter, more frequent firings.
A lesson I'd like to reiterate here is to always follow the manufacture's suggested use if you want to have an expected outcome. If you deviate from that, then test first.
In the meantime have fun claying around!