Polypropylene (PP) is a thermoplastic obtained by the polymerization of propylene. Polypropylene (PP) is a versatile, semi-transparent, lightweight, recyclable and with good organoleptic properties material.
There have been many attempts to make filaments of polypropylene although never have come to fruition because of the difficulty of printing of this material. Common filaments PP (polypropylene) have a high warping effect making it a plastic virtually impossible to print on a 3D printer. Because of this problem "3D Smart Materials" the Spanish company has been developing the new filament of Natural polypropylene PP Smartfil (1.75mm or 2,85mm) which is a PP filament with additives especially in order to improve its adherence to the printing surface, thus reducing the warping effect. In order to completely eliminate the warping effect and perform 3D printing without any problem with Natural PP Smarfil, it's recommended to use the Smart Stick adhesive.
The printed pieces with Natural polypropylene PP filament Smartfil (1.75mm or 2,85mm) offer flexibility, excellent mechanical and chemical resistance and excellent resistance to bending that make it ideal for a large number of industrial applications. It also provides a good vapor barrier and has good processability as it is the plastic material with lower specific weight as this is 0.90 g/cm3 (Ideal to reduce weight parts and components applied to the world of automotive and aeronautics).
Moreover, the parts made of polypropylene filament noted for their abrasion resistance and their ability to absorb shock (impact resistance), resistance to fatigue (Hence it is used in hinges) and further comprises a relative stiffness and flexibility. In contrast, one major drawback is their sensitivity to UV. While there is already a material 3D printing to offset this weakness of most plastics it is the ASA filament.
Polypropylene is used today in many varied uses; Since manufacturing of packaging, automotive, textile, furniture, medicine, plumbing, etc.
Although the polypropylene as the material is recognized by the FDA (Food contact), polypropylene filament Smartfil is not, because when making the additive for better printing properties, and also to contact the extruders stops fulfill this property does meet the generic material.