What’s in a FOAM MATTRESS?

What’s in a FOAM MATTRESS?


The Foam Density in a Foam Mattresses ….. What’s the difference? 


If you’re looking for a NEW foam mattress, one of the things you’ll need to consider is the Mattress Density you require!


When it comes to density it’s important to remember that higher numbers don’t necessarily mean a firmer mattress. What density really tells us is the quality of the foam and the durability & lifetime.


Typically FOAM MATTRESSES featuring higher densities tend to be heavier and more solid. Lower densities, on the other hand, are lighter and easier to move around. However, with higher densities, you can often expect the increase in the compression of material to provide better durability.



Why Buy A Foam Mattress? 


  • cost effective
  • easy to store & transport
  • removable zipper cover



Century Foam & Rubber - Foam Mattress - Density chart






Density Formula:






Occassional use

Guest bed

Occassional use

Everyday use

Suitable for: 

Small children 

Children of all ages

Heavy adult



The boring stuff …. read on for more science on Foam Densities


Density & Firmness


Many people mistakenly believe that a higher mattress density alone is an indication that a foam mattress will be harder and firmer than one with lower mattress foam density. In fact, a dense mattress can provide quite a bit of body contouring and pressure-point relief. The foam Indentation Load Deflection (ILD) – and not density – is what determines mattress firmness, as well as how much weight is required to indent it.



The Numbers Behind Foam Density


Also known as mattress foam density, this phrase refers to the mass of a cubic metre section of a mattress measured in kilograms per cubic metre (kg/m3). To calculate the density of a piece of foam, you divide the weight of the foam by its width x height x length. Density is expressed by the weight per cubic foot. 


In summary and to understand the coding system for foam density: A foam that weighs 23 kilograms per cubic metre and requires a force of 130 Newton 's to compress it to 40% of its original height therefore has a code of 23/130.


To make it easier to navigate the numbers behind foam density, we’ve put together a chart to explain mattress density to help you decide which foam mattress is for you. See above. 


Heavier adults and foam density …


If you carry a lot of weight, density will impact your level of comfort and the durability of the foam mattress you choose. Heavier people obviously sink into the material more deeply, and you want to find a foam mattress with a high expectation of durability. Therefore, a higher density would be more compatible with your unique needs. In the case of a foam mattress, it will also be worth choosing a thicker sized foam to counteract any sinkage. 


Luxurious Memory Foam … the bees knees of comfort! 


Also known as viscoelastic foam, memory foam was designed  for NASA airplane seats and is denser than high density foam mentioned above. Memory foam responds to body heat and pressure to evenly distribute weight and limit motion transfer. 

If you are looking to increase the density of your mattress, a memory foam overlay offers the most cost-effective solution. It will create softness, comfort and a luxurious feel to your permanent bed or temporary foam mattress without going to the expense of replacing your entire mattress. 


Acoustic Foam 


An even denser product is Acoustic Foam. The convoluted acoustic foam panels feature a classic “egg crate” designed to offer excellent sound deadening and echo absorption.

This foam is an affordable choice for soundproofing a room of any size, it’s easy to shape and cut to size. At the same time, they offer a level of rigidity and consistent firmness that delivers long-term durability, even in busy recording studios.



Who are the Foam Mattress Experts? 


Century Foam & Rubber are your Foam, Rubber and Upholstery experts. Visit us online at www.foamandrubber.com.au or on the Gold Coast at Shop 6, 46-50 Spencer Road, Nerang.
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