Polypropylene, also known as PP, has been mass-produced since 1950's .
-	It is a thermoplastic, (crystalline), polymer.
-	Applications: Used to make medical syringes, beakers, and parts for auto interiors.
-	General properties: It possesses high lubricity, high resistance to flexing (excellent for living hinges), excellent dielectric strength and chemical resistance, good impact strength, and high solvent resistance. It is inexpensive and electroplatable. It is difficult to paint, print on, or bond to. It will be attacked by fuming nitric acid and degraded by UV and ionizing radiation.
-	Trade Name: Marlex HGL, Fortilene 1800 series (FDA materials).