Slapdash Thermal Carafe

Make a thermal carafe out of leftover parts and trash!

The familiar Thermos Bottle is extremely useful as well as being a groovy science demonstration, but they can be a little expensive if you need a lot of them or plan to be careless with them.

A little research into how a thermos works can point the way to building an inexpensive substitute. Using a couple of plastic bottles, some insulating material, and simple tools, we can make a slapdash thermal carafe.

cutaway view
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The slapdash thermal carafe build log shows the steps for building a homemade thermos.

Predicatably enough, a thermal carafe made from junk doesn't retain heat as well as the professionaly-manufactured one, but it does OK. I tested the performance of the slapdash thermal carafe against a real Thermos brand thermos. The test results show how it did.


local documentSlapdash Thermal Carafe Summary Page

local documentCarafe Build Log

local documentCarafe Test Results

local documentAddenda (feedback from readers)

local documentThermos Bottle (at

local documentHow a thermos works (at

local document = local link

external document = external link

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