Poor sponges are not dense enough, so when you sit on them, you either sink into the sofa or feel like you are sitting on wood, without elasticity. The sofa doesn't feel like a sofa, which is called a "dry feeling" in the jargon. Good sponges are dense enough and elastic enough, with a springy feeling.

Good sponges have good elasticity, recover quickly, and are not easily damaged. Bad sponges will sink and break after sitting for one or two years.

Some sofa manufacturers use sponges produced by small factories, which cannot meet the quality and environmental protection standards. Tips for sofa manufacturers to save money:

1. Use cheap sponges produced by small factories, which are only half the price of those produced by famous factories;

2. Use the scraps to cut into sponge pieces and fill them into the seat cushion and backrest;

3. Use poor quality materials to make the bottom (such as A cotton);

4. Use recycled cotton. Recycled cotton is made of waste sponge glued together (glue contains a lot of formaldehyde, as those who are currently decorating their homes know). It looks colorful, but it is actually a health killer and has no elasticity. Manufacturers use it as the bottom material of seat cushions.

1. Appearance: Except for special sponges with large holes and random holes, the finer the surface of the sponge and the smaller the pores, the better.

2. Feel: Sponges that rebound quickly and are fluffy are good, while sponges that feel stiff are of inferior quality.

3. Temperature: Normal sponges have a little odor, but if the smell is unbearable, it means that inferior raw materials are used.

4. Tear strength: Good sponges are not easy to tear. If they are torn by a light touch of a finger, they are definitely shoddy. Generally, it is best for the sofa cushion to be concave about 10 cm after a person sits down. Generally, springs are added to the cushion to increase the resilience and durability of the sofa, so as to achieve the effect of extending its life.

The process of sponge determines its density. The current density of domestic sponge can reach but not exceed 45. Above 45 is a gum product. The cost of resin products is quite expensive and is generally used in aircraft cabins and luxury car seats. At present, no domestic furniture factory has such strength in sofas. The price of imported resin sofas is generally more than tens of thousands of yuan. In order to achieve the illusion of high sponge density, some domestic manufacturers artificially add talcum powder during the production process to increase its density. However, a large amount of formaldehyde, toluene and other ingredients that are fatal to the human body are used in the processing of fossil powder. Moreover, the addition of fossil powder makes it easy to fall off, which seriously damages the service life and performance of the sponge. When you sit on it, the sofa is hard, without any elasticity, and the surface is brittle. It is easy to fall off with a hand buckle.