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[Chemical Knowledge]：Polypropylene Powders and Granules: Differences and Advantages

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Polypropylene powder and granules are two common types in the plastic field. They have some similarities, but there are also some obvious differences. The following is a detailed description of the difference between polypropylene powder and granular material:

1. appearance:
polypropylene powder is a pure white powder material, with a relatively fine particle size, usually used in the production of various plastic products. Polypropylene granules are granular materials, the particle size is generally between 2-5mm, suitable for injection molding and extrusion processes.

2. Molding process:
polypropylene powder is suitable for blow molding, compression molding and injection molding and other processes; while polypropylene granules are mainly used for injection molding and extrusion molding. This is because the particles are easier to melt in the injection molding and extrusion process, which is conducive to the formation of a uniform melt, and the molding process is not easy to produce bubbles.

3. processing characteristics:
due to polypropylene powder particles are small, low melting temperature, so its melt viscosity is relatively high, the control range of processing temperature is narrow. The polypropylene particles have good melt fluidity, wider temperature range and stronger adaptability.

4. Mechanical properties: The mechanical properties of
polypropylene powder and granules are basically the same, because they are based on polypropylene. They are excellent in strength, hardness and wear resistance, and have good physical properties.

5. Product application:
polypropylene powder is generally used to make injection molding parts, film, foam plastic and fiber products. Polypropylene pellets are suitable for injection molding, and common products include plastic boxes, bottles, pipes, etc.

In general, there are some differences between polypropylene powder and granules in appearance, molding process, processing characteristics, mechanical properties and product applications. Polypropylene pellets are more commonly used in injection molding and extrusion processes due to their special morphology and superior processing characteristics. Whether it is to choose polypropylene powder or granular material, the key is to choose according to the specific product requirements and manufacturing process, in order to achieve the best production effect and product quality.

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