What are the key differences between PET & PETG?
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The 'G' that stands for glycol, is added at the molecular level to “PET” for providing distinct chemical characteristics. Here are the main differences between PET & PETG:
1- Flexibility:
Flexibility is the main difference between the two materials. PETG is more flexible than PET. Glycol addition in PETG makes it less brittle and softer than PET.
That's why PET is perfect for applications that require rigidity and high strength. On the other hand, PETG is ideal for durable and flexible applications.
2- Recyclability:
PET & PETG are both recyclable as they have the same properties. To be fair enough, PETG is more environmentally friendly. Less energy and resources are needed in PETG manufacturing processes.
3- Transparency
Both materials are transparent. PETG is slightly opaque while PET is more transparent. This makes PET perfect for packaging as transparency is necessary.
4- Mechanical properties
PET is a semi-crystalline material that is generally more rigid than PET. PETG is an amorphous material. That's why PETG is more stretcher than PET.
5- Thermal properties
PETG’S crystalline nature makes it good for higher temperatures while PET has more thermal resistance.
6- Prices
PET & PETG are both affordable. The only difference is that you can find PETG in variant colors compared to Polyethylene Terephthalate (PET). On the other hand, PET is chosen when rigidity is necessary.