Phoenix, I think I confused you or didn’t word something right and might have gotten on two different pages. When I said I thought it would be an easier comparison where ild’s were similar, I wasn’t comparing firmness. I was trying to say that I thought weighing out durability or quality of dunlop, natural vs synthetic blend (of mostly synthetic in an 80/20), would be more straight forward if their ild’s were the same or similar. In other words, comparing as closely as possible two materials (both dunlop) with as few differences and variables as possible. That’s the only reason I mentioned ild, not for reasons of firmness comparison.
I was looking at the differences between options for cores, or what I’m considering a core - the bottom 6" of a mattress build. Treating a technically 5.5" solid core or 2 3" layers (6" total) as the same for ease of comparison. One is a single 5.5" piece with a slight zoning (tri-zone duralux I believe) 31-35-31. Option B are two 3" layers, also dunlop, one layer 27ild the other 42 ild.
(Technically, if I were comparing ilds these wouldn’t be ‘exactly’ the same - but since dunlop is more of an ild range, I’m thinking 27 (high 20’s low 30’s) over 42 (low 40’s in the lower 3" of 6" total) is pretty close to 6" of dunlop ranging in the low to mid/upper 30’s. Purely for sake of comparing material types, for me I think these are close enough to each other in firmness to look past ild differences.)
I wasn’t trying to compare firmness, I only mentioned their ild’s to give some background on what I was comparing (since I felt it made it more apples to apples). Pretending that any real world variation in the firmness between options A and B didn’t exist, and they were of ‘same’ firmness - option A being 6" of 80/20 synthetic blend dunlop material, option B being 6" (2 3" layers) of natural dunlop… would it be smarter to opt for the all natural in terms of durability, or is the longevity/durability of synthetic blend vs natural not as noticeable in real world use?
Somewhere you misunderstood I think and thought I was comparing ild’s or different types of latex. I was comparing 2 versions of dunlop latex, both of the (for arguments sake) ‘same’ ild, and the comparison I was trying to make was natural vs synthetic blend. I have trouble getting across my meaning sometimes, just bear with me
… For instance, I work with tools. If someone said they found a ratchet wrench for $100 and another for $140 and they were both the same size and drive - the only difference being the cheaper one used plastic gears and the more expensive used all metal gears inside, I could feel pretty comfortable telling them the more expensive one would be of better value if they were concerned with how long the tool would last under daily use. I’m pretty confident that metal gearing would be much more durable and longer lasting and for slightly more up front investment they would get a good 10yrs out of a quality ratchet vs maybe 3 or 4yrs out of a lesser expensive version made of less durable materials. In the end they would have to determine what ‘value’ meant to them, but the higher price for a clearly higher quality material would be reflected in real world everyday use. At the very least, twice the useful lifespan for the higher quality components.
From most things I’ve read it sounds like the more natural latex the better, which might be why I’m questioning it. One of your posts clarifying latex mentioned “Dunlop blends that come from a high quality source are usually the lowest cost latex I would generally consider…” and "100% NR Dunlop or blended Talalay (70% SBR / 30% SBR) are the next up in price and are the most popular choices for overall performance and “value” " - what I gather from that is that in the overall scheme of things, latex is a high quality material over most others and likely more durable. Within the realm of latex, specifically dunlop, synthetic blends are the lowest end of the spectrum you’d consider while for a somewhat higher price, 100% NR dunlop performs better and offers better value. Obviously if blended dunlop lasts 10yrs and NR lasts 12yrs and the cost difference is substantial (double), the ‘value’ in terms of quality vs price isn’t as high. However if blended has a tendency to last 7yrs and NR lasts 12-15yrs, with a cost difference of only 25-30% - this would represent a much better value. 30% more cost up front, but with the likelihood of lasting 50% longer. Of course if averages said that the lifespan of NR matched the price difference - lasted twice as long as blended dunlop but costs twice as much as well, then it may just become a matter of how often someone is ok with replacing that layer. In comparing soft drinks, same brand same flavor - at the store, 1 liter costs $1. 2 liters costs $1.38 - if I’m willing to pony up the extra .38 up front, the larger bottle would last me longer or provide me with more product for only slightly more. If that same 2 liter bottle was $2, then it wouldn’t matter buying 1 2L bottle or 2 1L bottles - same price, same amount and the 2 liter bottle no longer represents much better ‘value’.
Cost is always a factor for me, so I guess what I’m getting at - if blended dunlop and NR are so close to one another in life expectancy, if paying $100-200 more for the same 6" layer to get NR is only likely to last a year or two longer than blended - I’m ok with a blended version since it’s not ultimately important to me personally to be ‘all natural’ for other reasons. That $200 would pay for a nice ticking or buy a couple more inches of talalay to go on top. However if the NR in most cases, under most circumstances will outlast the blend by 4-5yrs then an additional $100-200 up front is a smarter investment in my opinion. I’m not trying to ‘cheap out’ necessarily, just trying to make a more sensible choice. This is only to try and share where my thoughts on ‘sensible’ come into play, everyone is different and has different ideas of value or ‘worth’. I wouldn’t say someone was foolish for spending twice the price to get tires that had 20% more life expectancy if they felt it was ‘worth’ less hassle changing tires as often or was easier on the environment or any number of things. But for myself, I wouldn’t favor that tradeoff (not that i hate the environment lol) - it would make more sense to me to invest that money in 2 sets of tires and get 80% more use for the same amount of money and suck up the inconvenience of changing tires more often.