Source for more firmness options for memory foam and other foams

Beyond Mattresses
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Does anyone here know how to get different firmnesses of memory foams that are still high density? Id like 5lb but don’t know how to get anything but the soft stuff. I’d like to feel what it’s like to sleep on a tempflow mattress but already have 3 mattresses for one room and though likely justified for the price, my best option is to swap out layers on my DIY bed to try different feels.

Also with polyfoam I’d like to know how to get medium to medium soft foams cause i didn’t see many options

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Almost all memory foam layers have low density, 11 to 18 ILD. You can source Poly foam in various densities. These foams are labeled with 4 digit numbers. 2835 PU foam = 2.8 lb (first two digits), 35 ILD (last two digits).

Albany foam, https://www.roncofurniture.net, and others sell in various densities, ILDs. Buyfoam.com sells PU foam with various ILDs, but they don’t list their densities. Foamglobal on Etsy is another place.

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