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Your Position: Home - Environment - What is the difference between amorphous PET and crystalline PET?

What is the difference between amorphous PET and crystalline PET?

Amorphous PET vs Crystalline PET: Exploring the Differences.

Polyethylene terephthalate, more commonly known as PET, is a versatile and widely used material in various industries. Due to its exceptional properties such as durability, transparency, and thermal stability, PET has gained popularity in applications ranging from packaging to textiles. However, PET can exist in different structural forms, each offering distinct characteristics and applications. In this article, we will delve into the differences between amorphous PET and crystalline PET and explore their respective qualities and uses.

Amorphous PET.

What is the difference between amorphous PET and crystalline PET?

Amorphous PET is a form of PET with a non-crystalline, disordered molecular structure. This lack of long-range order in the molecular arrangement gives amorphous PET a transparent and glass-like appearance. Due to its non-crystalline structure, amorphous PET exhibits certain properties that make it suitable for specific applications.

1. Flexibility and Clarity.

One of the key advantages of amorphous PET is its high flexibility and clarity. The absence of a fixed molecular arrangement allows the chains to move more freely, resulting in a material with improved flexibility. This quality makes amorphous PET an excellent choice for applications that require bendable and easy-to-handle materials, such as clear plastic bottles or food packaging.

2. Enhanced Gas Barrier Properties.

Amorphous PET also possesses exceptional gas barrier properties. Its non-crystalline structure makes it easier for gas molecules to form weak interactions with the polymer chains, resulting in reduced permeability to gases such as oxygen and carbon dioxide. This property is vital for packaging applications involving perishable food items or carbonated beverages, as it helps to preserve their quality and freshness for longer periods.

Crystalline PET.

Crystalline PET, on the other hand, is PET that has a highly ordered, crystalline molecular structure. The presence of regular molecular arrangements creates specific properties that differentiate it from amorphous PET.

1. Higher Rigidity and Strength.

Crystalline PET is known for its increased rigidity and strength compared to its amorphous counterpart. The highly ordered arrangement allows for better packing of the polymer chains, resulting in a more compact and rigid material. Such qualities make crystalline PET suitable for applications that require enhanced mechanical properties, such as rigid packaging or structural components in various industries.

2. Higher Melting Point.

Another distinguishing feature of crystalline PET is its higher melting point. The organized molecular structure of crystalline PET requires more energy to melt and deform when subjected to heat. This characteristic makes it an ideal choice for applications involving high-temperature processes, including blow molding or extrusion.


In summary, the differences between amorphous PET and crystalline PET lie in their respective molecular structures and resulting properties. Amorphous PET offers flexibility, clarity, and enhanced gas barrier properties, making it suitable for applications such as packaging. Crystalline PET, on the other hand, provides higher rigidity, strength, and a higher melting point, making it suitable for applications requiring mechanical stability and resistance to elevated temperatures.

Understanding the differences between amorphous PET and crystalline PET helps industries in selecting the appropriate material for their specific applications. Whether it's packaging, textiles, or other manufacturing sectors, the choice between these two forms of PET can significantly impact the performance and quality of the final product.

If you have any further questions or would like to learn more about the applications of amorphous PET or crystalline PET, please do not hesitate to contact us.

Contact us to discuss your requirements of rPET pellets, rPET pellets, rPET pellets. Our experienced sales team can help you identify the options that best suit your needs.





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