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Expanded Perlite: Volcanic Glass Puffed in a Minute of Fierce Heat
Perlite is a volcanic glass with water locked inside. Heated fast into its softening range, the water turns to steam and puffs each grain up to 7–16 times its volume, brilliant white and light (Wikipedia). The U.S. Bureau of Mines (1946) found that grains up to ¼ inch need only 1 to 3 minutes at the right heat, somewhere between 1,600 and 2,600 °F depending on the ore.
The picture: expanded perlite (photo by KENPEI, Wikimedia Commons, CC BY-SA 3.0).
中级
A few hours
说明
1
1
Crush and size
Crush and size
Break the perlite ore into grains no bigger than ¼ inch and sieve out the large pieces.
此步骤所需材料：
珍珠岩矿石1 公斤所需工具：
手锤
粗筛2
2
Heat it fast
Heat it fast
Heat the kiln first. Drop a thin layer of grains in on a hot dish for 1 to 3 minutes, then take them out. Slow heating does not work.
所需工具：
窑炉
浅盘
长柄夹钳
电焊手套3
3
Find your ore's heat
Find your ore's heat
Each ore has its own heat, between 1,600 and 2,600 °F. Too cool and it hardly puffs; hotter puffs it more. Too hot and it melts, lets the gas out, and shrinks back to dense slag. Test small lots first.
所需工具：
窑炉浅盘长柄夹钳4
4
Float off the duds
Float off the duds
Tip the cooled grains into water. The expanded ones float; grains that did not expand sink. Skim the floaters off and dry them.
所需工具：
水桶
水此蓝图制作
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