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Polypropylene (PP)

Polypropylene (PP) is a polymer or plastic, derived from propylene or propylene and recyclable. It can be identified in materials through the triangular recycling symbol with a number " 5 " on the inside and the letters " PP " underneath) . Its molecular form is ( C3H6 ) x . Polypropylene is a type of plastic that can be molded using only heating , meaning is a thermoplastic . It has very similar properties to polyethylene (PE ), but with a higher softening point properties.

The polypropylene homopolymer is the base material to all kinds of PP and one of the most used types of PP . It has a high rigidity and resistance to higher temperature of the plastics in cobillionon use, allowing applications in continuous with temperatures above 100 ° C. Has a high contraction , like all semi -crystalline plastics , which decreases its dimensional stability , but its main limitation is the low impact resistance to frost.

The PP can be processed by extrusion, thermoforming and injection blow . It is used in various applications, such as garden furniture , parts for the automobile industry, biaxially oriented film with excellent transparency , high resistance ropes and raffias  and various types of closures and caps . Its high fatigue resistance makes the PP material of choice for making parts with integral hinges.

 

Main properties 

  • Low cost ;
  • High chemical resistance and solvent ;
  • Easy molding ;
  • Easy coloring ;
  • High resistance to bend fracture or fatigue ;
  • Good impact strength above 15 ° C;
  • Good thermal stability;
  • Increased resistance to UV rays , in gray ( ZPP ) and more sensitive to UV rays in White color ( PPN ) ;

The disadvantages of polypropylene are basically the low impact resistance at low temperatures, the reduced temperature range of melting , and low oxidation resistance . The first disadvantage can be minimized by blending with HDPE , or copolymers containing ethylene. The second can be eliminated by the addition of antioxidants and the third new technologies for the modification or formulation of the polymer itself.

 

Applications

  • Toys ;
  • Plastic cups ;
  • Container for food,
  • medicine ,
  •  chemicals ;
  • Trousers for appliances ;
  • Fibers ;
  • Corkscrew ;
  • Pipe for loads of ballpoint pens;
  • Carpets ;
  • Injection units ;
  • hospital sterilized material ;
  • auto parts (bumpers , pedals , battery housings , interior upholstery , lamps , fans, blowers , various parts in the passenger compartment ) .
  • Cable for hand tools .

Note : Currently there is a tendency to use the PP only inside the car . This is due to the ease of recycling material at the time of scrapping the vehicle , because such use would allow to know which material would be dealing with.