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Polypropylene Production Process


Polypropylene (PP) is a valuable, versatile plastic from the polyolefin family. The resin identification code for this plastic is "5." PP starts as a liquid monomer. It is then polymerized, making it a stable, solid polymer that is manufactured by extrusion, thermoforming, or injection molding.

Extrusion forces melted plastic through a mold before the plastic is cooled. 

Thermoforming, requires laying an extruded sheet of plastic over a mold. Next, heat and suction are used to form the plastic into the shape of the mold. Once shaped, these sheets are cooled and trimmed to create the finished product.

Injection molding is similar to extrusion. However, rather than forcing melted plastic through a mold, the plastic is forced into a mold cavity. The product is then cooled, ejected from the mold, and trimmed.




Recovery & Recycling Information 


Clear thermoformed PP, without ink or labels, is accepted for recycling throughout most of the U.S. and Canada. Packaging that is less than 2”x2”x2” or black in color is unlikely to be recovered at typical sorting facilities. Check with your local recycler to see if PP is accepted in your community’s recycling program.


Health and Safety of PP

PP is deemed safe for food and beverage use by the U.S. Food and Drug Administration and has been used safely for many years. PP does not contain Bisphenol A (BPA), dioxins, or plasticizers.




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