1. High-density sponge
High-density foam is a sponge whose weight per cubic meter of sponge reaches more than 45 kilograms. Now that the sponge technology has been improved, it is no longer desirable to judge the density of the sponge solely by weight. The sponge of the current process has high density and weight much lighter than the sponge processed before. The density of high-density sponge is no longer judged solely by weight.
2. Principle
In physics,
high-density sponge
2.1 High density sponge

The mass per unit volume of a certain substance is called its density. The symbol ρ (pronounced rōu). The main international unit is kilogram/m³; and the common unit is gram/cm³;. Its mathematical expression is ρ=m/V. In the International System of Units, the main unit of mass is kilogram and the main unit of volume is cubic meter, so the mass of 1 cubic meter of substance is taken as the density of the substance. For non-uniform materials, it is called "average density".
2.2 Index of sponge density
Density is an important indicator of the substance. The high density of the sponge means that the voids inside are smaller and the mass is larger. For example: 40 density means that the weight of a cubic meter of sponge is 40 kilograms, and 50 density means 50 kilograms per cubic meter. The sponge process has been improved, and density is judged regardless of weight. Instead, the density of the sponge pad is judged by more professional technical standards.
Three, sponge density classification
The method of distinguishing sponges in the industry is based on density. The density of sponges is KG/M3. It is the weight of each cubic meter of sponge.
Commonly used sponges are divided into three types: high density sponge, medium density sponge and low density sponge according to their structure. The high-density sponge has many holes and is full. It is often used for sound-absorbing cotton, sofa cushions, soft bags and other materials.
According to the interpretation of the national customs department, density ≥ 45 is high density, density between 45 and 18 is medium density, and density <18 is low density.
Fourth, the use of high-density sponge
Hardness of high density sponge
Generally speaking, high-density sponges have high hardness, but it is not ruled out that some high-density sponges will add super soft additives to make the sponge super soft, which are used to make sound-absorbing cotton, sofa cushions, and soft pack materials. Medium density and low density sponges are used as general protective materials. The hardness of the sponge with the same density is also different.
Generally, the density of sponge for sofa cushions is about 35, and there are soft, hard and super soft specifications. The mattress is generally around 22. The so-called high-density sponge is a term commonly used by salesmen when introducing products. High-density sponges are generally not used to absorb water.
Use of high-density sponge
It has the characteristics of absorbing external force, delicate, soft, and comfortable. It can meet a variety of market needs in industries such as automobiles, furniture, kitchen cleaning sponge,health care, and toys.