A thermoplastic semi-crystalline polymer that is the second most widely used plastic material in the world. Mechanical properties vary significantly based on the molecular weight and crystallinity of a given batch of material, as well as from additives. It is resistant to fatigue and is therefore often used in applications where the material sees large strains. It is resistant to physical damage, chemicals, impact, and freezing.
In additive manufacturing, the material tends to warp upon cooling, making it a challenge to print in systems without heated chambers. The material is used in material extrusion systems in filament and pellet form and as a powder in powder bed fusion systems. There are several photopolymer materials available for vat photopolymerization that are not polypropylene but have been designed to have properties similar to polypropylene.
Abbreviated as PP.
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