Hi heywannaplay,
Please go back and read the previous reply I offered you in post #2 in this thread, specifically the links to post #6 and the SBR link.
The latex component (rubber particles dispersed in water) of latex foam can be sourced:
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As [url=https://mattressunderground.com/our-articles/latex-pros-and-cons.html]natural latex [/url]from the Hevea Brasiliensis tree (rubber tree) – What we call NR, or; -
As man-made latex – [url=https://mattressunderground.com/our-articles/latex-pros-and-cons.html]Styrene-Butadiene[/url], what we call SBR.
When making latex foam, it can be made via two processes: Dunlop or Talalay. To keep it simple, I’ll describe the Dunlop process here.
To make “rubber foam” (what we call latex foam), you would take an amount of the liquid latex component (either some from the Hevea tree (NR), some from the man-made (SBR) or a mixture of both) and mechanically beat it mix it and mix it with air to get it to foam. The you would mix that with a gelling agent like sodium silicoflouride, which in the presence of zinc oxide sets the foam into gel in a mold, into which this is poured. The gelled foam is then vulcanized in steam, stripped from the mold, washed and dried. A secondary gelling agent is usually added to prevent premature collapse and reduce gelling time. That’s it, in a very simplified form.
The resulting latex foam rubber would be called 100% NR if the liquid latex used to make the foam was all from the Hevea tree. If the latex foam rubber used liquid latex in the process that was all man-made, it would be called 100% SBR latex. If the latex foam rubber used a portion of each liquid latex from the Hevea tree and a portion of man-made liquid latex, it would be termed SBR/NR latex rubber foam.
You can see more about the differences between SBR and NR rubber in post #2 here.
You can read more about synthetic continuous pour Dunlop latex in post #2 here and there is more about natural rubber and synthetic rubber in post #2 here.
You can read more about Dunlop (of either type) vs Talalay latex in post #7 here.
You can read a bit more about organic Dunlop in post #6 here.
Polyurethane foam is not latex foam, as I mentioned previously.
Phoenix