I've been searching for hours and so far have come up dry. Dunlop processed latex is inherently less uniform, denser on the bottom due to settling during the process and so provides a sort of integral layered property of softer on top, firmer on bottom. Is this for all dunlop process? (molded, not continuous pour variety). Or does this tend to hold more true of natural and less true of synthetic? Also, I've been trying to find out if there's any 'rough' estimation of the firmness difference from top to bottom.
For instance, it's accepted that talalay has a sag factor of around 3 associated with it. Dunlop has a sag factor of around 4 associated with it. Is there someplace I can find that would have this info? Such as 'dunlop being denser on the bottom than on the top, this equates to roughly a 10% or 20% difference between the top of a core and the bottom'? Something along the lines of typically, the bottom surface of a 6" core will be x amount firmer than the top.
Also, is the tendency to be firmer on the bottom half more related to natural than it would to something more consistent like sbr? Or does it have more to do with the dunlop process itself (ie, regardless of natural or sbr, the dunlop method always has more density along the bottom).
My reason for asking is I'm considering a 6" blended dunlop core that's 80/20 (mostly synthetic). Being that most of it is synthetic material, will there still be that density variation providing me some benefit in being able to flip the core soft side down if I need it more firm (similar to swapping a firm/med pair of 3" layers).. or has that benefit been decreased substantially due to the high amount of sbr? The price on the single core is attractive, but if there won't be much difference achieved from flipping it should I want to try a different configuration, I might be better off with 2 3" layers. I'm sure it's only a minor difference flipping a 6" core. Guessing in the dark here, but I imagine if it's 36 ild on top of the soft side, a 6" core would feel similar to 3" 36 over maybe 3" 40 ild on bottom. If a bigger variation was needed, it would take 2 3" layers with a wider difference, correct?
If the answer is yes, all dunlop (hopefully blended being more similar to natural than all synthetic) by nature is denser/firmer on it's lower half, then a 6" core would provide me with at least some noticeable adjustment by flipping it. If the answer is no, being 80% synthetic it will be more consistent and lose much of that density/firmness difference top to bottom that dunlop is known for, then it won't give me much wiggle room to make any adjustment by flipping it. Obviously 2 3" pieces of say 36 and 44 would give me much more clear cut firmness adjustments (and be much easier to handle) but it's also much more costly. I just don't want to be suckered in by a good price only to find out that flipping that particular blend makes hardly any difference (more like talalay, where if you flip 36 ild any which way it's all the same just a thicker piece).
Thanks