The material of the filter element directly determines its filtration efficiency, durability, chemical compatibility, and applicable scenarios. The following is a performance comparison and typical application scenario analysis of common filter cartridge materials:

1、 Paper filter cartridge

Core material

Made from natural wood pulp or synthetic fiber pulp, the surface is treated with resin to enhance strength.

Performance characteristics

Filtering accuracy: usually 5-100 μ m, belonging to medium low precision filtering.

advantage:

Low cost, suitable for one-time use scenarios.

Lightweight and easy to install.

Disadvantages:

Poor corrosion resistance, prone to expansion and deformation when in contact with water or oil.

Low pollution capacity, frequent replacement is required after blockage.

Applicable scenarios

Automotive air filter: filters dust particles in the air to protect the engine intake system.

Coarse filtration of lubricating oil for ordinary industrial equipment, such as primary filtration of hydraulic systems in construction machinery.

Pre treatment filter element for household water dispensers: As a substitute for PP cotton filter element, it is used for coarse filtration of impurities.

2、 Metal material filter element

1. Metal mesh filter element (stainless steel/copper mesh)

Structure: Composed of multiple layers of metal wire mesh (woven or sintered) stacked together, with uniform pore size.

Performance characteristics:

Filtering accuracy: 10-200 μ m (depending on mesh density), belonging to coarse or medium filtration.

advantage:

High temperature resistance (up to 300 ℃ or above), high pressure, and strong corrosion resistance.

Can be repeatedly cleaned and used, with a long lifespan.

Disadvantages:

Accuracy is limited and cannot meet the requirements of precision filtration.

High cost and heavy weight.

Applicable scenarios:

Industrial high-temperature gas filtration: such as boiler inlet and primary filtration of gas turbines.

Hydraulic system return oil filtration: intercepts large metal debris to protect the pump body and valves.

Food and beverage industry: filter particles and impurities in syrup and alcohol (must meet food grade standards).

2. Sintered metal filter element (stainless steel powder sintering)

Structure: Metal powder is sintered at high temperature to form a porous structure with high porosity.

Performance characteristics:

Filtering accuracy: 1-50 μ m, can be precisely controlled by adjusting the powder particle size.

advantage:

High strength, able to withstand high pressure (such as hydraulic system pressure).

Corrosion resistant, wear-resistant, suitable for harsh environments.

Disadvantages:

The difficulty of cleaning is high, and special solvents or ultrasonic cleaning are required after blockage.

The cost is significantly higher than that of metal mesh filters.

Applicable scenarios:

Aerospace hydraulic system: filters small particles in precision oil to ensure the normal operation of servo valves.

Filtration of corrosive media in the chemical industry, such as acid-base solutions and organic solvents.

Ultra pure water system for semiconductor manufacturing: removes metal ions and particles from water to meet high-purity requirements.

3、 Polymer/Fiber Material Filter Cartridge

1. Polypropylene (PP) filter cartridge

Core material: Polypropylene fibers are made through hot melt spraying technology, forming a honeycomb like porous structure.

Performance characteristics:

Filtering accuracy: 1-100 μ m, with a wide range of accuracy and customizable production.

advantage:

Chemical corrosion resistance (acid, alkali, oil), strong compatibility.

Low cost, foldable design increases filtration area, and has a high capacity for dirt.

Disadvantages:

High temperature resistance is average (temperature resistance ≤ 80 ℃), not suitable for high temperature scenarios.

The fibers may detach and require an outer support structure.

Applicable scenarios:

Pre filter element for household water purifier: As the primary filter, it intercepts large particles such as sediment and rust.

Industrial circulating water filtration: filters suspended solids in cooling water to protect heat exchangers.

Food processing industry: Filter impurities in fruit juice and edible oil to meet FDA food contact standards.

2. Polyester fiber (PET) filter cartridge

Core material: Polyethylene terephthalate fiber, with higher strength than PP.

Performance characteristics:

Filtering accuracy: 5-50 μ m, commonly used for medium precision filtering.

advantage:

Wear resistant and tear resistant, suitable for media with high flow rates or high particle content.

Good temperature resistance (temperature ≤ 120 ℃), suitable for filtering warm liquids.

Disadvantages:

Poor corrosion resistance to strong oxidants such as concentrated sulfuric acid.

Applicable scenarios:

Automotive engine fuel filtration: filters paraffin and impurities in diesel to adapt to low-temperature environments.

Spray painting industry paint filtration: intercepting particles in the paint to ensure uniform coating.

Textile printing and dyeing wastewater treatment: Filter dye particles and fiber impurities in the wastewater.

3. Nylon (PA) filter cartridge

Core material: Polyamide fiber, excellent wear resistance.

Performance characteristics:

Filtering accuracy: 10-100 μ m, suitable for high viscosity media.

advantage:

Outstanding oil resistance, commonly used for lubricating oil and fuel filtration.

High tensile strength, capable of withstanding high pressure.

Disadvantages:

Poor resistance to strong acidity and alkalinity, not suitable for highly corrosive environments.

Applicable scenarios:

Hydraulic oil filtration for construction machinery: filtering debris from oil under heavy load conditions.

Ink filtration in the printing industry: ensuring fine ink and avoiding nozzle clogging.

4、 Activated carbon filter cartridge

Core material

Filled with coconut shells, fruit shells, or coal based activated carbon particles, or sintered into columnar/sheet-like shapes.

Performance characteristics

Filtering mechanism: Remove organic matter, odors, pigments, and some heavy metal ions through adsorption.

advantage:

Strong adsorption capacity, the higher the iodine value (such as ≥ 1000mg/g), the better the adsorption effect.

Suitable for liquid and gas filtration, with strong versatility.

Disadvantages:

Poor filtering effect on particulate matter, it needs to be used in conjunction with other filter cartridges (such as PP cotton).

After adsorption saturation, it needs to be replaced as a whole and cannot be regenerated (some industrial activated carbon can be regenerated at high temperatures).

Applicable scenarios

Rear filter element in household water purifier: removes residual chlorine, color and odor in water, and improves taste.

Air purifier: filters harmful gases such as formaldehyde and smoke.

Food and pharmaceutical industry: decolorization and deodorization (such as purification of glucose solution and filtration of traditional Chinese medicine extract).

5、 Ceramic filter cartridge

Core material

Made by sintering ceramic materials such as diatomaceous earth, aluminum oxide (Al ₂ O ∝), or silicon carbide (SiC).

Performance characteristics

Filtration accuracy: 0.1-10 μ m, uniform microporous structure, belonging to high-precision filtration.

advantage:

High temperature resistance (alumina ceramic temperature resistance ≥ 1000 ℃), corrosion resistance, suitable for extreme environments.

Smooth surface, not easy to adsorb impurities, easy to clean (reusable).

Disadvantages:

High brittleness, collision should be avoided during installation (partially reinforced with glass fiber for toughness).

High cost, mostly used in high-end scenarios.

Applicable scenarios

Industrial high-temperature flue gas filtration: such as dust recovery in coal-fired power plants and steel plants.

Ultra pure water filtration in the medical industry: removes bacteria and heat sources (endotoxins) to meet injection water standards.

Outdoor portable water purifier: capable of filtering bacteria and suspended solids in river water, suitable for emergency drinking water.

6、 Membrane filter cartridge (polymer/inorganic membrane)

1. Polymer membranes (such as PP, PVDF, PES)

Types: Microfiltration membrane (MF, 1-10 μ m), ultrafiltration membrane (UF, 0.01-0.1 μ m), nanofiltration membrane (NF, 0.001-0.01 μ m), reverse osmosis membrane (RO, 0.0001 μ m).

Performance characteristics:

Filtration accuracy: graded by pore size, RO membrane can intercept viruses and heavy metal ions.

advantage:

High separation efficiency, capable of achieving molecular level filtration.

Low operating pressure (ultrafiltration/microfiltration) and low energy consumption.

Disadvantages:

Easy to be contaminated (such as organic blockage), requiring regular chemical cleaning.

Polymer membranes have poor temperature resistance (usually ≤ 60 ℃).

Applicable scenarios:

Household RO water purifier: removes minerals from water and produces direct drinking water.

Biomedical industry: ultrafiltration separation of proteins and viruses, purification of vaccines.

Industrial wastewater treatment: Nanofiltration membrane recovers heavy metal ions to achieve resource reuse.

2. Inorganic membranes (such as ceramic membranes, metal oxide membranes)

Performance characteristics:

High temperature resistance (up to 500 ℃), chemical corrosion resistance, suitable for complex industrial working conditions.

Disadvantages: Extremely high cost, narrow range of membrane pore size adjustment.

Applicable scenarios:

High temperature reaction liquid filtration in the chemical industry, such as melt filtration in polyester production.

Food sterilization: Ceramic ultrafiltration membrane intercepts bacteria at room temperature and retains nutrients (cold sterilization technology).

Based on the characteristics of the medium (temperature, corrosiveness, viscosity), accuracy requirements, frequency of use, and cost budget, comprehensive selection should prioritize the compatibility and long-term reliability of materials and equipment.