How to Choose, PP or PET Filter Cartridge?

pet or pphow to choose

Table of Contents

Liquid filtration is a very important step being widely used in many industries and manufacturing processes. The Filter Cartridge is one of the essential element of the filtration setup.

In some situations, we face a problem since Polyester (PET) and polypropylene (PP) cartridges are both common materials of filter cartridges as well as they share many same characteristics, How to choose between them for certain applications?

Firstly, we need to be aware of the similarities between them.

melt blown cartridge likefilter

Similarities between PP and PET

Environmental safety

Both polyester and polypropylene materials are relatively environmentally friendly and safe materials that do not harm the environment or human health.

Efficient filtration

Both polyester and polypropylene filter cartridges can effectively filter impurities, microorganisms, and other contaminants, improve water quality, and ensure the safety of drinking water.

Physical properties

Both polyester and polypropylene are plastic materials with good physical properties and chemical stability. In addition, they are both common materials and easy to process and manufacture.

Secondly, although they share many similarities, they are still different materials and have different characteristics.

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Differences between PP and PET

Chemical structure

Polyester is a polymer composed of multiple ester units, while polypropylene is a polymer composed of propylene monomers.

Physical properties

Polyester is generally more resistant to high temperatures, wear-resisting and stretch-proof, but polypropylene is more flexible and has better toughness.


Polyester is generally more expensive than polypropylene, but its filtration performance is relatively better.


Considering the similarities and differences between Polyester (PET) and polypropylene (PP), their application scenarios can be roughly divided as follows.

Polyester filter cartridges are usually suitable for applications that require high-level filtration, such as:

Drinking water filtration

Polyester material can effectively remove odor, discoloration, heavy metals, bacteria, and other impurities in water, ensuring the safety and health of drinking water.

Wastewater treatment

Polyester material can filter out suspended particles, sediments, and other impurities in wastewater, purifying wastewater and achieving the goal of recycling.

Medical and health

Polyester water filter cartridges can be used in the medical and health industry for filters, air purifiers, etc., to remove bacteria, viruses, and other microorganisms, ensuring the hygiene and safety of medical and health facilities.

Polypropylene water filter cartridges are suitable for some low-demand situations, such as:

General household water filtration

Polypropylene water filter cartridges can remove large particle impurities such as sediment and rust stains in tap water, improving the taste and flavor of tap water.

Agricultural irrigation

Polypropylene filter cartridges can be used in agricultural irrigation to filter out sediment, branches leaves, and other small impurities in irrigation water, preventing damage to the irrigation system.

In summary, the filter cartridge made of polyester and polypropylene materials have differences in terms of filtering effect and suitable applications, and the appropriate material should be chosen based on actual needs.

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