The Difference Between HDPE and PET?

What’s the Difference Between HDPE and PET?

HDPE and PET plastics are very popular for manufacturing bottles, especially for pharmaceutical products. And while the two are quite similar on the surface, there are a handful of differences that set them apart from each other.

HDPE Plastic Bottles

High-density polyethylene, or HDPE, is one of the most common plastics used in manufacturing. Known for their strength and durability, HDPE bottles can withstand temperatures ranging from -110° to 165° F. While it isn’t a clear plastic, HDPE can be used to make semi-opaque bottles that allow consumers to see the products inside. HDPE can also be color matched and is very popular in white.

PET Plastic Bottles

Polyethylene terephthalate, or PET, is used for packaging in a wide variety of industries. However, it’s clearness (comparable to glass) makes it ideal for beverages and other liquids. PET isn’t as temperature-resilient as HDPE; it can handle temperatures from around -40° up to 130° F. However, PET does provide a barrier against diluted acids, oils, and alcohols that typically attack other plastics. Like HDPE, PET can be matched to any color.

Is HDPE or PET Better for Pharmaceutical Packaging?

It all comes down to your specific needs. HDPE is slightly more resistant to impact than PET and provides greater temperature resistance and a very good water vapor barrier. PET, however, is lighter, more versatile in its appearance, and more resistant to chemicals that might negatively affect other plastics.