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I am trying to build a homemade thermos. It needs to be able to conserve the heat in 125ml of water for 15 minutes.

However, unlike a normal thermos, it also needs to be able to be heated. What homemade substances can I use that are not flammable, yet provide a relatively high degree of insulation?

Note that my thermos will be heated with a flame from a candle for 25 minutes.

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Consider using a ceramic container. You could adjust the density, thickness, and size to match your insulating requirements.

"home made' is loose, here, since you would need to acquire oven bake-able ceramics, or a similar product. (unless you have a kiln lying around).

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