Hey Lotus,
Well does it make sense? Most of it not really, some of it, yes it makes sense.
Most all Dunlop process companies around the world sell on density, this is very common, but almost all of the factories have testing equipment that provides a range of ILD averages for each Density. We do have some contact with the Lien A USA people and I sent email to see if I can get the info the factory provides.
The fact that it is 100% natural has no bearing on whether a latex core can be ILD tested. I do not recommend one trying to convert density to ILD. Of course, there is some statistical correlation to weight and ILD, but it differs for each manufacturer, differs for 100% natural and Blended (formula), and differs between Talalay and Dunlop (process). I would say that the “Firm 85D” would feel very similar to other 100% natural firm 85D products from India and Sri Lanka. I think you have tried some of the organic versions from our members. I am sure the ILD’s listed are close, but I am hesitant about the 85D being only 29-31 ILD.
Dunlop and Talalay aren’t directly comparable in terms of firmness using only ILD numbers because there are several factors that can affect how soft or firm a mattress (or an individual layer) feels besides just the ILD of the material, see post #4 here.
Dunlop and Talalay that are the same thickness and ILD won’t feel the same in terms of their firmness for most people because they have a different response curve and compression modulus (how quickly a material becomes firmer as you sink into it more deeply). There is more about the difference between Dunlop and Talalay in see post #7 here.
And a little more info about ILD’s / different formulas and processes here post #6 here.
You may have read these links already but wanted to share for the rest of the people, it brings up a good topic not always well understood. Thanks, I will send update when we receive any info from Lien A.
Thanks again.
Sensei