With higher molecular weight, crystallinity decreases thus plastic becomes more resistant to environmental stress cracking. HDPE is highly prone to environmental stress cracking due to its semi-crystalline nature. In terms of stress cracking, PET bottles and containers have better resistance vs HDPE. First and foremost, it’s the appearance – PET is a clear plastic while HDPE is opaque. While PET and HDPE plastics are both excellent packaging materials, there are some notable differences which set these materials apart. HDPE vs PET – Suitable Packaging Material Looking for Superior Chemical Resistance in PET? Choose as per your requirement » So, if you need to make a plastic component that has better stiffness, toughness and transparency at room as well as slightly elevated temperatures (~50C), then PET is your material your choice over PBT. In case of PET, the time used to cool down polymer decides its amorphous and crystalline behavior.Ĭompared to PBT, PET has somewhat higher strength and rigidity, but it is less flexible and tougher and has lower chemical resistance. PBT crystallizes faster than PET and remains crystalline. Also, while PET can be either in the semi-crystalline state or in the amorphous state, it is not possible under normal processing conditions to produce PBT parts that are amorphous. PBT differs only slightly from PET in chemical composition but more substantially in its properties such as its higher crystallization rate and lower melting point. The key feature that makes two polymers distinctive is the use of alcohol resulting in ester group. Polyethylene terephthalate (PET) and polybutylene terephthalate (PBT) both belong to the polyester family. Let’s begin by comparing apples with apples. Also do not forget, PET is one of the most recycled thermoplastics as well.Īdditionally, there have been continuous efforts to tailor PET properties for improved performance with beneficial cost profiles to meet high-end application demands.Īt the same time, polypropylene, polyethylene and polyvinyl chloride are equally popular for these benefits, so how do you find which one is suited for you? In this guide, you will find out the key knowledge to find the suitable grade among thousands of options available. For all the applications demanding lightweight and impact-resistant material, PET is of your choice. You find the polymer used in packaging, fabrics, films to molded parts for automotive, electronics and many more. PET is among those plastics which are an important part of your everyday life. Most common application include rigid and flexible packaging as it is very light weight. It has a semi-crystalline form when stable. It is widely used in everyday items and easily recyclable. Polyethylene terephthalate or PET belongs to the family of polyesters. It shows resistance to impact, moisture, alcohols and solvents. It finds use in packaging, textiles, films to molded parts for automotive, electronics. It is used in everyday items and easily recyclable. Polyethylene terephthalate (PET) is an aliphatic polyester.
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