UBUCIKO
UBUHLE NEMPILO
UBUCIKO BEZANDLA
AMASIKO NOMLANDO
EZOKUZIJABULISA
IMVELO
UKUDLA NEZIPHUZO
REVERSE ENGINEERING
IZAYENSI
EZEMIDLALO
UBUCHWEPHESHE
IZINTO EZIGQOKWAYO
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).
Ophakathi
A few hours
Imiyalelo
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.
Izinto zokwakha zalesi sinyathelo:
Itshe le-Perlite1 kgAmathuluzi adingekayo:
Isando sesandla
Isihlungo esibanzi2
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.
Amathuluzi adingekayo:
Isithando
Isitsha esingajulile
Udlawu Olunezibambo Ezinde
Amagilavu okushisela3
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.
Amathuluzi adingekayo:
IsithandoIsitsha esingajulileUdlawu Olunezibambo Ezinde4
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.
Amathuluzi adingekayo:
Ibhakede
AmanziIzinto
1- 1 kgIsibambeli
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