So... if I have a PSI (25%) deflection value of, say, 4... that would be a minimum ILD of 96 (4 pounds/square inch * 24 square inch minimum sample size), if I'm understanding correctly?
The Foambymail quote seems to be saying they use a big foot (50 in^2) on a possibly much smaller sample (24 in^2); it would seem that ILD would thus depend on the sample size... -Kurt On Thu, Sep 2, 2010 at 10:21 AM, David Cummings <[email protected]> wrote: > 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 -- You received this message because you are subscribed to the Google Groups "Nighthawk Motorcycle Lovers!" group. To post to this group, send email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/nighthawk_lovers?hl=en.
