The real ratings defined for the density of a mattress in the actual weight of the memory foam and is calculated in cubic meters, such as 105 Kg/m3, It is basically the same calculation by weighing a cube of memory foam measure 1 foot each way if you are not as familiar with modern measurements and prefer imperial measurements. Imperially, the density is displayed in pounds, for example 5.3 lbs.
A good rule of thumb is to look for companies such as the best mattress brand that offer a long and very comprehensive warranty or guarantee, as many producers of foam with lower density will not offer much more than 12 months.
As we all have different preferences of comfort, it is important that we don’t rely solely on the manufacturer’s rating of the firmness, but look at the ILD to understand how soft or hard the mattress will feel.
The best way you have of learning about the firmness of the memory foam mattress is to check the ratings given by the manufacturers. The standard terminology for the firmness rating include the soft as well as medium and finally firm.
Understanding The ILD Ratings of the Memory Foam Beds Actually as well as Why It is significant:
ILD is used as the short term for Indentation Load Deflection that is defined in the most simple of terms, how much soft or firm a memory foam mattress will be.
The example below will help you to understand much better the ratings for ILD of the memory foam mattress.
It is a combination of the ILD and density of a foam mattress that gives you the most accurate picture of its level of firmness and quality.
Manufacturers calculate the ILD by measuring the amount of force in pounds that is needed to indent 25% into a memory foam layer of 4 inches. This is tested by using equal amounts of stress on 50 square inches to press into the memory foam by 25%. The pressure level needed to indent the foam by 25% of the total depth is calculated as a weight.