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Thread: Mylar Vs. Foil

  1. #9
    JMurphy97's Avatar
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    For that blanket you can just cut it up to fit and won't have the creases right? I to use foil right now but I'm going to switch.

  2. #10
    Hello, I must be going... Not a Number's Avatar
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    Quote Originally Posted by JMurphy97 View Post
    For that blanket you can just cut it up to fit and won't have the creases right? I to use foil right now but I'm going to switch.
    The space blanket will have creases. Just pull it as tight as you can when you tape it down. A heat gun would probably take out the creases but wreak havoc on your plant temps. Remove the plants
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    ChronoKiento's Avatar
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    I think the pet store (somewhat) near my house has mylar for the back of fish tanks and stuff but I don't know if it's mylar or just reflective material...
    Last edited by ChronoKiento; 01-23-2007 at 01:14 PM. Reason: typo
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    Av8tor1's Avatar
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    hydro shops should be a good source... I have bought some pretty nice stuff from edmund scientific over the years... and their description of mylar sounds a lot like the blankets, and if you look at the pic carefully you will see the same size creases



    Mylar Reflective Film Sheeting

    Mylar – History and manufacturing

    DuPont developed Mylar in the mid-1950s. In 1960 and 1964 NASA launched the Echo satellites, 100-foot diameter (30M) balloons of metallized 0.005 inch (0.13 mm) thick Mylar film.

    In manufacture, a film of molten PET is cast on a roll and subsequently stretched orthogonally to the direction of travel. One side is normally microscopically smooth, while the other side contains microscopic asperities, which promote adhesion of coatings and printing media.

    Mylar can be aluminized by sputtering a thin film of metal onto it. The result is much less permeable to gasses (important in food packaging) and reflects up to 99% of light, including much of the infrared spectrum. Like aluminum foil, aluminized Mylar has a shiny reflective side and a dull side. Mylar does not tear easily, unlike tin foil and aluminum foil.

    Metallized nylon (or "foil") balloons used for floral arrangements and parties are often mistakenly called "Mylar". Many museums, archival institutions and those in the collecting areas of currency, stamps and comics use Mylar to protect their collectibles from damaging light rays.

    In addition, farmers and hydroponics enthusiasts employ Mylar in their craft because the highly reflective nature of the film increases plant growth and yield by 35% or more.

    Useful as an insulating material to reflect away heat and/or light, and as a light filtering element. Pkg. of 2.

    Specifications:

    * Thickness: 0.5 mil
    * Dimensions: 56" x 84"
    * Reflectance: 90%; 0.4 to 15 micron range
    * Transmission: 10%; 0.4 to 15 micron range
    * Mylar Sheeting (Pkg. of 2)

    item number: 3053604 Mylar, Blanket Sheeting Pkg/2 56" x 84", Reflects 90% Of Body Heat Back, Weight 2oz

    edit: but given the choice of creases or no creases well... thats a no brainer
    Last edited by Av8tor1; 01-23-2007 at 03:00 PM. Reason: add comment

  5. #13
    ChronoKiento's Avatar
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    OMG! I JUST order a bunch of stuff from that site! In fact, I JUST got the shipment today! xD Damn that sucks!

    I'll remember that for later! I can't believe I didn't think to look there!
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    Av8tor1's Avatar
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    Well Chrono,

    Every indication I see is that what they have is the same blanket...only a couple dollars more expensive, which is kind of common for Edmund

    I agree with "Not" a hair dryer should take out the wrinkles... but if I lived near a hydro shop, and I wasnt in the number 3 area for pot production and I wasnt a teacher.. I would go to the hydro shop LOL

    be my luck it would be full of my students LMAO

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    ChronoKiento's Avatar
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    I've done a little bit of research on this and apparently emergency blankets are made of specially made aluminum with a plastic coating but other than that there is not much of a different between it and mylar since on one site it says that a sheet of mylar as a substitute for an emergency blanket. That specifically is because it reflects body heat but if they are both similar in that way then I would imagine they are similar in their light reflection properties as well. Or at least close enough that there's not a noticeable difference.

    So yeah, Av8tor1 is right! Basically the same thing. ^^

    About the creases... do they really matter? Surely they'd work themselves out eventually but I wouldn't think that it'd matter since it would only change the direction that it reflects the light? If the whole area is enclosed in reflective material then it shouldn't matter, right?
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    Av8tor1's Avatar
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    I changed one half of my bulbs, and added the e-blanket material to the light fixtures creases and all... everything else was exactly the same with the exception of a shorter photoperiod to simulate the change in season

    so with both changes I'll admit it is not really a controlled experiment but FWIW previous bulb changes havent ever made that much of a difference

    before:



    after:


    now i will admit that the original reflectors were pretty cheesy (Wal-Mart el-cheapo w/ electronic ballast) so the visible lumen difference was pretty intense

    Av

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