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What kind of thermos do you have?

  1. Mar 8, 2017 #1
    Thermo is a container to contain hot water used at home. What is the other term for it? Do yours have plastic inside or glass? I'm just worried the plastic chemicals may be released from the boiling water. Note this is not room temperature water. What is the safest thermo.. isn't the plastic based carcinogenic or can cause health problems? Thank you
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  3. Mar 8, 2017 #2


    Staff: Mentor

  4. Mar 8, 2017 #3
    Haha, glass. Remember those? Do they still make those? I think I had a Batman thermos when I was in grade school in the 1970's. Kids used to drop them all the time and the glass inside would break. I would always shake mine a little before I poured a drink to listen for the rustling of broken glass inside...


    These days I use a ceramic-lined mug (bubba). Works great. Even better than stainless steel which can impart a little metallic taste. I would stay away from plastic even if it does say BPA free. Ceramic is about as safe as it gets and it keeps the coffee hot hours longer than the plastic travelmugs. It's a little more expensive, mine was $25, but it's well worth it just in the coffee you don't throw out because it gets cold..

  5. Mar 9, 2017 #4
    That's brilliant.. do other guys here also use ceramic boiling water container or plastic?

    But I'm looking for 40 oz boiling water container for use in home. You know.. where it holds boiling water for the entire family.

    But about the term vacuum flash. It's not really vacuum.. is it? why is it called vacuum?
  6. Mar 9, 2017 #5


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    Last edited by a moderator: May 8, 2017
  7. Mar 9, 2017 #6
    Last edited by a moderator: May 8, 2017
  8. Mar 9, 2017 #7


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  9. Mar 9, 2017 #8


    Staff: Mentor

    That would be vacuum flask. It's called a vacuum flask because inside the outer shell of the flask, the flask itself is double-walled. When the flask is manufactured, air is evacuated from the space between the inner and flask, and then the opening between the inner and outer wall of the flask is sealed. Another name is Dewar flask, in honor of a Scottish scientist of that name. See https://en.wikipedia.org/wiki/Vacuum_flask

    Here's a drawing of the cross-section of a vacuum flask. The outer shell is not shown.
  10. Mar 9, 2017 #9
    What do you mean ceramics can leach metals.. where will the metals come from? I'm talking of this ceramic jar someone shared earlier whose kinds plan to get but want to get this leeching thing clarified first. thanks. https://www.bedbathandbeyond.com/st...e=&network=s&gclid=CKrl9KPayNICFY6Iswod1cEBZQ
  11. Mar 12, 2017 #10


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    You can do a search of leaching from ceramics, such as from dinnerware and storage vessels.

    The common example is leaching of lead into wine from a decanter made with lead glass.

    I do not know the chemical composition of a ceramic lining.

    I am pointing out that just because something is not plastic does not mean that it can have other issues of its own.
  12. Mar 13, 2017 #11

    Dr Transport

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    Last edited by a moderator: May 8, 2017
  13. Jun 29, 2018 #12
    I have a personalized stainless steel thermos, it is perfect for keeping my hot drink hot for long time. Plastic chemicals increase the risk of cancer and interfere with brain development and fat metabolism.
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