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Using crushed glass,sand and plaster of Paris insulation of cone
Here are two videos one using sand and plaster of paris and the other one is perlite and sodium silicate
https://www.youtube.com/watch?v=uIRTcmR6sSk
https://www.youtube.com/watch?v=xv9nnEhgfuY
Using crushed glass,sand and plaster of Paris insulation of cone