>From the foambymail website:

 ILD: Indentation Load Deflection - A measure of the load-bearing
capacity of foam. ILD is generally measured as the force (in pounds)
required to compress a 50 square-inch circular indentor foot into a
4-inch thick foam sample no smaller than 24-inches square to a stated
percentage of the foam's initial height. Common ILD values are
generated at 75% of initial height.

-Dave

On Wed, Sep 1, 2010 at 11:06 PM, Kurt Nolte <[email protected]> wrote:
> That's just it, man. I'm reading through McMaster's spec sheets for
> their closed cell polyethylene foam. The densities seem to cap out at
> 5 (with 2.3 and lower being more common) and a "PSI (% deflection)"
> spec instead of an ILD. I get a tensile strength, and occasionally a
> stretch limit range, but no compression modulus... I'm rather
> disappointed, this time around.
>
> I've used McMaster numerous times before, usually I get a lot more of
> the info I need than I am this time.
>
> -Kurt
>
>
>
> On Wed, Sep 1, 2010 at 10:45 PM, Allen Thomas <[email protected]> wrote:
>> Mcmaster carr sells practically everythin including any foam you could
>> want and the have spec charts to help you figure out what you want if
>> you don't know.
>>
>> On 9/1/10, Joey Kelley <[email protected]> wrote:
>>> I'm with Kyle on that one....
>>>         I had mine redone by a local guy, trying to start a name for
>>> himself in the upholstery business - it looks less like a 80s Honda
>>> seat now, more like an ATV, but I actually prefer it, looks cleaner.
>>>         -Joey
>>>
>>> On Wed, Sep 1, 2010 at 8:58 PM, Kyle Munz <[email protected]> wrote:
>>>> Um, that's way over my "cut up the couch and steal the foam" level. :)
>>>>
>>>> -Kyle
>>>>
>>>>
>>>> On Wed, Sep 1, 2010 at 7:00 PM, Kurt Nolte <[email protected]>
>>>> wrote:
>>>>>
>>>>> So, let me bounce some stuff off you guys, since the specs listed on
>>>>> the DIYmotorcycleseat.com site don't seem to be standard with the
>>>>> suppliers I'm looking at.
>>>>>
>>>>> Since neither of my foam inserts are really in any decent shape to put
>>>>> back on the bike (lots of dry rotting and cracking), I'm looking to
>>>>> use one of them as a basic shape guide and just making something new.
>>>>> DIYms suggests a high density polyethylene closed cell foam as a base
>>>>> layer, but I'm not finding much info on the ILD and compression
>>>>> modulus specs on supplier websites.
>>>>>
>>>>> I do have specs for "PSI (% deflection)" which seems to be how much
>>>>> PSI (usually 4-9) it takes to hit (usually 25%) a certain compression.
>>>>> I don't know if this is comparable to ILD; anyone here know? Anyone
>>>>> here a materials engineer?
>>>>>
>>>>> Thanks!
>>>>> -Kurt
>>>>>
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>>>
>>>
>>>
>>> --
>>> -Joey Kelley
>>> Need Computer Technical support?
>>> http://www.crossloop.com/JoeyKelleyComputerServices
>>> At your service - via remote control!
>>>
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>>
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>
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