Mickey spell solar terms case

Using foam puzzles usually requires ventilation. After touching these products, wash your hands frequently and reduce smoking and eating. Once you have symptoms such as skin and respiratory tract, you should go to the hospital in time.

Foam plastic is also called microcellular plastic. The whole plastic is covered by numerous interconnected or unconnected micropores, which obviously reduces the apparent density. It has the advantages of light weight, heat insulation, sound absorption, earthquake resistance, moisture resistance and corrosion resistance. According to its cell structure, it can be divided into closed cell, open cell and reticulated foam.

Almost all the pores of closed-cell foam are broken. Almost all the cells of open-cell foam are connected. Foams with almost no cell walls are called reticulated foams. According to the density of foam, it can be divided into low foam, medium foam and high foam.

Extended data:

Compared with pure plastic, foamed plastic has low density, light weight and high specific strength, and its strength increases with the increase of density. It has the ability to absorb impact load, excellent cushioning and shock absorption performance, sound insulation and sound absorption performance, low thermal conductivity, good thermal insulation performance, excellent electrical insulation performance, corrosion resistance and mildew resistance. Flexible foam has excellent elasticity and other properties.

Plastic with many holes in it. It is made by mechanical method (introducing air or carbon dioxide while mechanically stirring to foam it) or chemical method (adding foaming agent). There are two types: closed-cell type and open-cell type. Closed-cell pores are isolated and floating; The pores of the naked eye type are interconnected and have no floatability. It can be made of polystyrene, polyvinyl chloride, polyurethane and other resins. It can be used as thermal insulation and sound insulation materials, and has a wide range of uses.

References:

Bubble-Baidu Encyclopedia