What is the Difference Between PP and PET?

Polypropylene (PP) and Polyethylene Terephthalate (PET) are two types of plastics with distinct properties and uses. The main differences between PP and PET are:

1. Chemical Structure: PP is a saturated polymer, while PET is an unsaturated polymer.
2. Versatility: Both PP and PET can be molded into various shapes, but PET is considered more versatile and pliable.
3. Heat Resistance: PP plastic resists heat from outside better than PET, while PET plastic resists cold from outside much better than PP.
4. Filling Temperature: The filling temperature of PET containers is up to 71 degrees Celsius, while the filling temperature of PP containers is up to 80 degrees Celsius.
5. Impact Resistance: PET plastic cups have slightly better impact resistance than PP containers.
6. Transparency: PET is more transparent than PP, making it a better choice for applications where transparency is important.
7. Barrier Properties: The oxygen and carbon dioxide permeability of PP bottles is about 30 times that of PET bottles, making PP unsuitable for barrier packaging of carbonated beverages.
8. Processing Speed and Efficiency: PP bottles have a slower processing speed and poorer physical properties than PET bottles, resulting in lower production efficiency.

Both PP and PET have their advantages and drawbacks, and the choice between them depends on the specific requirements of the application. PP is often used for packaging yogurt, medicine, drinks, and condiments, while PET is commonly used for clothing, containers for food and liquid, and thermoforming.

Comparative Table: PP vs PET

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**PP (Polypropylene) and PET (Polyethylene Terephthalate) are two types of plastic materials with distinct properties and applications. Here are the key differences between them:

Please note that these properties are generalizations and may vary depending on the specific formulation of the material.