In the last couple of years I have seen a lot of new memory foams on the market with a density of 70-85kg m3.
Be careful, there are some “colleagues” that claim to sell medical mattresses that are in fact of a density of around 70kg m3 which is therefore not medically certified. In the medical field a higher density than 50kg m3 is never used. Also, a higher density will also react stronger on temperature differences and will react slower on smaller margins in temperature differences. It will become warmer and it will take up less moisture, this is because the foam will become more compact if the density is higher. When the cells are smaller this automatically means the mattress provides poorer ventilation (the materials ability to breathe). The high density feels harder and reacts slower making it slightly heavier to move around while sleeping in your bed. In cold foam we talk of HR (High Resilience) and cold foam is in principal similar to polyether in that the higher kg m3 the better.Ī higher density will react better than the lower density foams. With memory foam we talk about kg m3, this gives us the density and in turn the cell structure make up. The memory foam only weighs more it does not make it better. So it’s not like with polyether that the more volume weight, the more kg in a cube the better. Soft, medium or firm can all be made from the same density of e.g 50kg m3. It doesn’t indicate anything of the quality of the viscose polyurethane and tells us nothing over the hardness or softness of the foam (bed). The only thing density tells us is about the cell structure and how much it weighs. Density can be made higher by applying pressure thus in a high density object the cells will become smaller thus the density increases. Density refers to the cell structure the higher the density the narrower the cell structure.
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