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Old 06-06-2013, 09:55 PM
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Foam -- Open cell vs closed cell?

Hi all. Due to having back problems, I like to
add extra lumbar support to my seats. The local
fabric store sells sheet foam in various thickness,
but it only comes in open cell.

Is this OK to use in a seat back? Will it last, or
would closed cell foam be a better choice?

Thanks,
ROE

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Old 06-07-2013, 06:36 AM
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Foam

when i did the interior on my bucket i got 1" hi density sheet of black foam from a H&V supplier. its been a while so i can't recall if it was 4x4 or 4x8.. but it worked great. i also put an extra strip across the back for lumbar too..
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Old 06-07-2013, 07:20 AM
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You can buy open cell foam in any density to add to your lumbar area. Open cell foam is what your entire seat is made of, closed cell foam is generally used in thinner layers and would be a lot more expensive than open cell foam the thicker it gets. If you can't find a supplier, PM me and I'll explain it in more detail, and order you whatever you want.
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Old 06-07-2013, 09:04 PM
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Thanks for the replies. Good to know that's what
the seats are made from. Which brings up another
question; what are the different densities?

I bought a sheet of 1" open cell and installed a lumbar
pad this afternoon. Looks OK and feels even better.
The foam cells are very small, so I assume it's probably
a high density foam.
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Old 06-08-2013, 07:35 AM
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Foam is designated with a four number system. The first two numbers indicate the quality of the foam, which is basically just how much urethane is in the foam. The higher the number, the better the foam. Really good foam would be up to about 40. The second number indicates the density, or indent load deflection (ILD) which is firmness. Those numbers can go up over 100, but basically start at 10, which is super soft, and go up to about 90, which is so firm you almost can't even dent it. 25 would be considered soft, and 65 and higher is considered firm. So, 1825 foam has way less quality and way less firmness than 3565.
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Old 06-09-2013, 09:40 PM
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Dan, thanks for the foam description numbers.
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Old 07-12-2013, 12:38 PM
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FWIW another thing to remember is that open cell foam acts like a sponge with liquids whereas close cell does not. Closed cell foam is what all good sleeping pads and backpacking pads are made from.
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