The durability of a cold foam mattress is highly dependent on the density (RG) of its foam core. The volume density is the density of the foam in kilograms per cubic meter (kg / m³). A high density means high elasticity of the foam with low material fatigue. The mattress, therefore, has a longer life.

Many a mattress buyer makes the mistake of confusing the volume weight with the degree of hardness of the mattress. Care should be taken here because even a very hard mattress can have a low volume weight because little material was used in its production. While the degree of firmness of the mattress is determined by the compressive strength, the volume weight indicates the material density and is thus an indicator of quality and durability.

Volume weight and durability – an overview

RG 20-25

It is an extremely lightweight foam quality. Such a mattress is worn out after a year or two. This may be enough for a rarely used guest bed, for the permanent use of this quality is rather not recommended.

RG 30

These mattresses are of light quality and should be replaced after two to three years. Again, sporadic use of the permanent is preferable. Those looking for durability should prefer mattresses with higher density.

RG 35

This is where the good quality that comes with a shelf life of five to six years begins. A mattress with this density is a good purchase for a longer period.

RG 40

Very good quality mattresses that last for an average of six to eight years thanks to their relatively high material density.

RG 50 – 60

Those who have high standards appreciate mattresses with this density because of their top quality. On such a mattress, you can bed for ten years, until it then gives way and should be replaced.

RG 75

Mattresses with this density are clearly in the luxury segment. They have an extremely high quality, which of course has its price. A mattress with such a high density of material has a lifespan that can be well over ten years. Do not miss to know when are mattress sales for the best deal.