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PP (Polypropylene) filament

PP filament is a printing filament for 3D printers made from a material called polypropylene. This plastic is commonly known from everyday life, such as food packaging, automotive parts like bumpers, or plastic boxes with integrated hinges. The main characteristic of polypropylene is its high chemical resistance, which means that it resists many acids, alkalis and solvents. It is also very tough and flexible, allowing it to bend without breaking. This property makes it suitable for printing so-called 'integral hinges', which are thin sections of plastic that act as a flexible joint directly on the print. However, printing with polypropylene filament is more challenging due to its tendency to shrink on cooling. This phenomenon, known as "warping," causes the corners and edges of the print to lift and curl away from the print pad. For successful printing, it is therefore necessary to use a heated print pad and often a special surface such as a polypropylene plate or wide packing tape to ensure sufficient adhesion of the first layer. Polypropylene has a low density, so prints from it are lightweight. In addition, it absorbs almost no moisture, which makes it easier to store. It is therefore used for the production of functional prototypes, durable mechanical parts, packaging, liquid containers or any component that requires flexibility and chemical stability. Although the material is often used in the food industry, it is necessary to verify that a particular filament has the necessary certification for food contact.

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