Hi pixbroker,
Oops it seems I forgot to add the Las Vegas link. It’s fixed now … and thanks for letting me know.
Unfortunately density is completely independent of the softness/firmness of a foam and any density can be made in a wide range of firmness levels and in the case of memory foam with a wide range of different properties. Density ratings are the weight of 1 cubic foot of foam so the only way to calculate density would be to weigh the material in each layer separately, calculate the number of cubic feet in the layer, and then divide the weight by the cubic feet to get the density rating.
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NOTE: couldn’t figure out how to attach images here (add file would not bring up file dialog), but the images are hosted here:
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There seems to be some glitch (possibly in the template of the site) that I’ve never been able to track down and that seems to affect some browsers. It sometimes works if you click inside the window to the right of the attachment number (above the Add File box).
If you’d like I can also download the images and attach them to your post for you (I use firefox which works for attachments).
Phoenix