Polypropylene (PP) is a thermoplastic which is a polymer that can be molded at a certain temperature and solidified once cooled. Polypropylene is used in many different ways. Some common uses include consumer product packaging (plastic jars), toys, car dashboards, medical syringes, and many others.
When did it all start?
Polypropylene was first produced by G. Natta by the polymerization of propylene monomer in 1954.
What's so great about PP?
- PP is best known for its fatigue resistance, chemical resistance and environmental stress cracking resistance. It is extremely durable and resistant to higher temperatures.
- PP is typically inexpensive and readily available.
- PP has good impact strength
- PP is resistant to chemical absorption
Polypropylene Fun Facts
- Resin identification code is 5.
- Melting temperature is 130° C (266° F).
- Polypropylene is synthetic which means it doesn't naturally occur in nature.
- PP is considered one of the safest plastics on the market today.
- PP is FDA-approved for food contact.
- Because of its heat-tolerance, most PP containers can be heated in a microwave or cleaned in a dishwasher
- PP is BPA-free
At Citadel Packaging you can find an assortment of dispensing and continuous thread caps made of polypropylene. You can also browse our PP double-wall jars.