What is a styling sponge? What are its characteristics?
　　 stereotyped sponge refers to polyurethane soft foam, which includes jewelry box sponge, red wine packaging sponge, electronic packaging sponge, sponge packaging, etc.
　　 But it can be classified. According to physical requirements and test standards, different additives can be added. It can be divided into British fireproof sponge, American fireproof sponge, yellowing resistant sponge, antibacterial sponge, antistatic sponge, conductive sponge, etc.
　　The relationship between the physical properties of the stereotyped sponge. High density-good elasticity (same hardness)
　　High density-harder (same elasticity)
　　 Low hardness-poor elasticity (same density)
　　 Due to the influence of gravity, the upper and lower density gradient of horizontal foam foam can reach 2kg/m3, and the difference between soft and high density is more. And the factors that affect the physical properties of the stereotyped sponge
　　1. The temperature, humidity and atmospheric pressure of the environment.
　　2. Types of raw materials (molecular weight distribution, EOPO content, etc.)
　　3. The accuracy of the measurement system.
　　4. The temperature of the raw material. In fact, the most important thing is: density, surface hardness and resilience. These three are the most important. If you follow these three, then all the things in your stereotyped sponge are of a better type.

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