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The difference between medicinal plastic bottle PP and PET

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The difference between medicinal plastic bottle PP and PET

2019-06-08
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Health care products plastic bottle manufacturers below to introduce the difference between pharmaceutical plastic bottles PP and PET:


There are three main types of medicinal plastic bottle materials, namely polyethylene (PE), polypropylene (PP) and polyester (PET). There are certain commonalities and differences between medicinal plastic bottles of polypropylene and polyester. Mainly as follows:


1, polypropylene (PP)

Polypropylene (PP) bottles have the advantages of transparency, firmness and heat resistance, and the price is lower than that of traditional materials. In the molding, it is mainly molded in a one-step injection blow molding machine and a two-step heating stretch blow molding machine.


PP bottles have better heat resistance and can be hot filled at 100 ° C, while ordinary PET bottles can not be filled at a temperature higher than 76 ° C of glass transition. The quality of the PP bottle is lighter than that of the PET bottle. PP bottles also have certain defects. PP bottles are slower than PET bottles and have poor physical properties, which is the main reason why they cannot be widely used. In addition, the low rigidity of PP means that the PP bottle has a lower top load and peripheral strength than the PET bottle; under the same rigidity, the bottle wall of the PP bottle must be thicker than the bottle wall of the equivalent PET bottle.



2, polyester (PET)

PET bottles have the characteristics of light weight, high transparency, impact resistance and non-fragmentation, and can also prevent carbon dioxide gas, which is the packaging material for beverage products on the market.


PET has higher transparency and gloss than PP. PET also has more defects, and the price is much higher than PP.

Through the above introduction, I believe that everyone has some understanding of the difference between pharmaceutical plastic bottles PP and PET.

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