Hi brass,
Radium is part of the Vita Group that makes Vita Talalay. Latexco / Sleep Comp (now Latexco West) is an American distributor for Vita Talalay and markets it under their own Talalux brand name but doesn’t make it.
Puralux is their continuous pour Dunlop and it’s also a natural/synthetic blend (usually about 20% natural and 80% synthetic) and Naturalux is their tradename for the 100% natural Dunlop they sell (usually Latex Green).
No … they sound more like 100% natural Dunlop designations. Latexco is also a supplier for Latex Green (their 100% natural Dunlop) and you can see the Latex Green density and ILD numbers here which is more likely what they are selling.
The easiest way to differentiate latex is based on the type and blend (as well as the ILD or density depending on how the firmness is rated).
It can certainly be confusing
Phoenix