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The density of (PP) is between 0.895 and 0.92 g/cm³.Therefore, PP is the commodity plastic with the lowest density.With lower density, moldings parts with lower weight and more parts of a certain mass of plastic can be produced.

Polypropylene is the second-most widely produced commodity plastic (after polyethylene) and it is often used in packaging and labeling.

Polypropylene is in many aspects similar to polyethylene, especially in solution behaviour and electrical properties.

The methyl group improves mechanical properties and thermal resistance, although the chemical resistance decreases.

The melt flow rate (MFR) or melt flow index (MFI) is a measure of molecular weight of polypropylene.

The measure helps to determine how easily the molten raw material will flow during processing.

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