Density and Hardness?
The higher the density of the memory foam layer, the heavier the memory foam and the closer the cell structure. This will provide better support and a longer lifespan. The density does not determine the firmness of the foam. The ILD (Indentation Load Deflection) rating is the specification that determines firmness. It is best to pick a mattress that is not too soft. Anything less than 10 ILD is considered too soft and does not support your body when you sleep. 75 kg/m3 density is currently the highest density foam produced in the UK. Higher density foams ie 85 kg/m3 are usually imported from China and Eastern Europe that may not be compliant with the strict UK BS 5852 & BS 7177 flammability standards. ILD (Indentation Load Deflection) is a rating system used in the United States to gauge a memory foams hardness or softness. ILD rating is calculated by the amount of pounds or weight that is needed to achieve a 25 percent compression on a foam using a 50 square inch indentation. ILD rati
