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  1. #1
    Senior Member headchange4u's Avatar
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    Thermadrape: Vapor Barrier Awesomeness.

    At this years Mt. Rogers hang out I was introduced to a new material to use as a vapor barrier. FishinFinn had an under quilt made from a thing called a Thermadrape. What's a Thermadrape (TD) you ask?A TD is a blanket made from Mylar (space blanet) with a soft backing. According to the PDF I found it's constructed from:

    Cellulose and Cotton--enhances patient comfort and reduces the cooling effects of evaporation caused by perspiration.
    Low Density Polyethylene--acts as a water-repellent layer to fluids.
    Aluminum--retains heat; applied in droplet form which stops conduction.
    The TD has almost none of the plastic-bag-like crinkle that you normally get from a space blanket or plastic sheeting vapor barriers. It is light weight (7.6oz for an unmodified TD), compacts down to a small size, and seems to be much sturdier than space blanket I've come across. Could this be the ultimate in vapor barriers?

    FishinFinn had made an under quilt/vapor barrier that he used at Mt Rogers. He assumed that it added another 15-20* of warmth to his hammock setup. He will have to provide details on the quilt

    Here's a shot of the package.


    Here's a shot of an unmodified TD, a shot of the front and backside of the material, and a closeup of the material.




    I am really excited about he potential of this material. FishinFinn sent me my TD so I have no idea where to buy them. I would assume that you could get them from a medical supply store.

    My TD also included this ultra-cool head cover. I plan on making it into some sort of pot cozy or perhaps I will use it to make fake UFO videos by filming it sailing through the air
    “Light thinks it travels faster than anything but it is wrong. No matter how fast light travels, it finds the darkness has always got there first, and is waiting for it." -Terry Pratchett



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  2. #2
    cool, i had heard about aluminized medical blankets. care to send small sample for me to check out? i'll send you a piece of a heet sheet to look at. it's probably similar. very soft and quiet on the shiny side and the other side is like 1/32" ocf. i'd like to compare them to eachother

  3. #3
    Senior Member fin's Avatar
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    I will just add that attroll has been testing mine recently as a stand-alone UQ, and should pipe in here as to it's properties, usability, etc., with maybe a pic? Mine is a little heavy, due to the wool suiting middle layer. I could have used a much lighter middle layer, like silk or ????(use your imagination.)

    I really like this as a UQ on its own, or as a cold weather UQ booster. Its VB properties is one of the best things about it. Back it with 1.1 sil or untreated, and you have a pretty lightweight, reusable, sturdy, packable, stuffable UQ.

    As the unmodified version is only 7.4 oz (is that with or without the headgear?), you should be able to make a pretty lightweight UQ, especially for 3+ season use. And, they only cost $10 at my source.

    So, HC4U has busted the super-secret Thermadrape UQ club. At least we still have our secret handshake.

    And I thought it would be cool to take several of the headgears, and make hammock sleep socks.

  4. #4
    Senior Member animalcontrol's Avatar
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    Quote Originally Posted by FishinFinn View Post
    And, they only cost $10 at my source.
    Do you have enough for the WHOLE class?
    Can anyone purchase thru your sorce?
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  5. #5
    Senior Member Rushthezeppelin's Avatar
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    How low would you think this stuff could go as a standalone UQ?

  6. #6
    Mrprez's Avatar
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    I'd be interested in this as well.

  7. #7
    MacEntyre's Avatar
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    Quote Originally Posted by FishinFinn View Post
    And I thought it would be cool to take several of the headgears, and make hammock sleep socks.
    You beat me to it! Just turn them inside out and slip them on your tootsies at night.

    Pretty impressive claims:

    Type of Body Heat Conserved
    Convective Heat Loss--Heat loss to air currents (25% of loss)
    Radiant Heat Loss--Heat loss in the form of electromagnetic energy from the body to colder objects in the room (65% of loss)

    Of course, that's in a hospital setting... with larger temperature differences, there will be larger losses.

    Looks like they use it backwards to what we want:
    Last edited by MacEntyre; 02-16-2009 at 19:28.
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  8. #8
    Senior Member Rushthezeppelin's Avatar
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    It has cotton in it?

  9. #9
    MacEntyre's Avatar
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    Yes, cotton and cellulose... on a synthetic substrate. You would have to keep it dry.
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  10. #10
    Senior Member Rushthezeppelin's Avatar
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    Quote Originally Posted by MacEntyre View Post
    Yes, cotton and cellulose... on a synthetic substrate. You would have to keep it dry.
    Definitely.....so perhaps make the outer cover out of sil or dwr?

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