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'[OT] Mylar Balloons'
2007\02\02@182055 by William Chops Westfield

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On Feb 2, 2007, at 2:52 PM, Peter P. wrote:

> Mylar balloons usually have this solid tail thing which is heavy
> and are filled with air-helium mix so they don't raise too
> enthusiastically.

All the "mylar" balloons I've had have had considerably more lift
than any normal sized latex balloon.  The "tail" is 4 layers of
the plastic film, not really "solid", and not even heavy enough to
keep that side of the balloon pointing downward.

I keep hearing about that air/helium mix, but I don't think it's
true.  All the shops we frequent have a single (set of) helium
tanks used to fill both mylar and latex balloons, and it's color
coded like HELIUM (which is a widely used industrial gas, and
therefore nice and cheap.)

>
> I understand that mylar balloons can last  a really long time
> in the air unlike latex (weeks).

True.  And you can revive them too.
http://www.instructables.com/id/ETFY7A96IPEUN32UYQ/

>
>  Mylar is  very tough as plastics go

Yes, but "mylar balloons" are not made from mylar. :-)
IIRC they're usually a double layer film of nylon and polyethylene.

>
> It is also tough enough to withstand serious internal pressure.
> It is nearly impossible to burst or tear a mylar balloon under
> normal conditions.
>
Nah.  Too much pressure and they pop a seam or burst.  They just
don't STRETCH much.  (a latex balloon bursts when it reaches maybe
1000% of normal size, a mylar balloon when it reaches 105%?  But the
internal pressures are probably similar (and damn close to normal
atmospheric pressure.)  They're tougher than latex, but you can
burst them without too much trouble.  The kids have all done it,
I think, by plunking their 50+lb bodies down on top of one...

BillW

2007\02\02@192730 by Nate Duehr

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On 2/2/07, William Chops Westfield <spam_OUTwestfwTakeThisOuTspammac.com> wrote:

> Nah.  Too much pressure and they pop a seam or burst.  They just
> don't STRETCH much.  (a latex balloon bursts when it reaches maybe
> 1000% of normal size, a mylar balloon when it reaches 105%?  But the
> internal pressures are probably similar (and damn close to normal
> atmospheric pressure.)  They're tougher than latex, but you can
> burst them without too much trouble.  The kids have all done it,
> I think, by plunking their 50+lb bodies down on top of one...

If you're looking for balloons that don't pop -- go for weather balloons.  :-)

http://www.eoss.org

(GRIN)

Nate

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