In some stores, sales consultants convince buyers that they are better off buying foam rubber of a certain color, as it is more dense, high-quality and suitable for the client’s goals. However, in reality, density has nothing to do with color. If we recall the school physics course, it will become clear that density is the ratio of body weight to the volume it occupies. Accordingly, to find out the density, you need to weigh a piece of foam and know at the same time its volume. In this case, you can use special online calculators.
It is another matter if stores offer to buy foam rubber without packaging and assure that it has some specific characteristics. In such cases, you need to request goods with packaging and focus on the values indicated on it. Do not forget that the quality of foam rubber is affected not only by density, but also by rigidity and elasticity. And all these three criteria cannot be highly combined in one material. For example, if there is an insignificant density, but high rigidity, accordingly, the elasticity will be insignificant. Therefore, if furniture with high elasticity is required for furniture, it is necessary that its stiffness be lower and its density higher.
If it is assumed that a significant load will be exerted on the foam, for example, 90-100 kg, then, of course, the stiffness should be higher and the density lower. In this case, layering can be used with a combination of layers of different densities, because it determines the durability of the product. It is not surprising that this very characteristic often determines the cost of foam rubber. This is how the ST brand is distinguished, which, as you might guess, has standard features. Such foam rubber is usually used for stuffing armrests and chair seats. The EL brand is characterized by increased rigidity, it is used in the manufacture of hard mattresses, as well as for laying sofa seats. The most comfortable from the point of view of operation is the HR brand. They purchase it for the production of orthopedic mattresses and high-quality furniture, since such foam rubber has insignificant rigidity, but excellent elasticity.
Given all this, you do not need to go to the entreaties of sellers and purchase cuts of foam without packaging. It is necessary that the foam was packaged without damage and the seller had a certificate for these products.
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