Very nicely explained Mark. John Ridderbos said that pool noodles were open-cell - sorry John they are closed-cell - but foamed polyolefin (usually polyethylene, polymethylene for the Brits...). the stuff can't be machined though since it will melt ery easily with any heat build up. The sufaces often looked pitted like many open-celled foams but that is because the cells in the material are large and end up getting sliced through. Because of those characteristics what you cut is what you get...the materials foams are made out of are myriad, but many of them have places in flytying. but those places aren't usually interchangable, EVA (craft foam), PVC, polyolefin foam, etc.
Mark Delaney
Mark Klemick <[EMAIL PROTECTED]> wrote:
Mark Klemick <[EMAIL PROTECTED]> wrote:
--- Wes Wada <[EMAIL PROTECTED]>wrote:
> So, what is open-celled foam?
>
Wes,
Closed cell foam is characterized by internal bubbles that are
enclosed. Air or water can't get in or out. Open cell foam is
more like a sponge, in that there are holes in all the bubbles
that are open to neighboring bubbles. So they can become
saturated.
If you've ever used foam earplugs, you know that you squeeze and
compact the cylinder tightly before putting it in your ear. Then
it slowly expeands to shape. This is open-cell because air can
flow back in as it rebounds.
Neoprene is a good example of closed cell. Nothing penetrates
because the bubbles have no holes connecting them with neighbors.
If you squeeze it hard between your fingers, it rebounds
immediately because the bubbles have merely distorted, not
emptied.
Mark
which happen to be open-cell
=====
Mark Klemick ! GoFishGo ! [EMAIL PROTECTED]
__________________________________
Do you Yahoo!?
SBC Yahoo! DSL - Now only $29.95 per month!
http://sbc.yahoo.com
So much water, so little time!
Website: http://chemprof.tripod.com/fishing.html
E-mail: [EMAIL PROTECTED]
Do you Yahoo!?
SBC Yahoo! DSL - Now only $29.95 per month!
