Special plastics generally refer to plastics with special functions that can be used in special applications such as aviation and aerospace. For example, fluoroplastics and silicones have outstanding special functions such as high temperature resistance and self-lubrication, and reinforced plastics and foams have special properties such as high strength and high cushioning properties. These plastics belong to the category of special plastics.
a. Strong plastic: Reinforced plastic raw materials can be divided into three types: granular (such as calcium plastic reinforced plastic), fibrous (such as glass fiber or glass cloth reinforced plastic), and sheet (such as mica reinforced plastic). According to the material, it can be divided into cloth-based reinforced plastic (such as rag reinforced or asbestos reinforced plastic), inorganic mineral-filled plastic (such as quartz or mica filled plastic), and fiber reinforced plastic (such as carbon fiber reinforced plastic).
b. Foam: Foam can be divided into three types: hard, semi-rigid and flexible foam. Rigid foam has no flexibility and has a high compression hardness. It only deforms when it reaches a certain stress value. It can not be restored after the stress is relieved. The flexible foam is flexible, has a small compression hardness, and is easily deformed. Reverted to its original shape with less residual distortion; the flexibility and other properties of semi-rigid foam are between the hard and soft foams.
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