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01 Jun

FAQ About Sintered Porous Metal Filter

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Porous Metal Filter Element


Here are the answers to frequently asked questions about the sintered porous metal filters. Read on for more information.


Q1. Why choose a sintered porous metal filter?

A: Filtration systems using sintered porous metal filters for gas, solid and liquid separation have proven to be an effective and efficient alternative. It can replace other separation methods that are susceptible to pressure spikes, high temperatures or corrosive environments. Compared to vane filters, bags and plate and frame filters, sintered porous metal filters are highly efficient at removing particles, provide reliable performance, are easy to clean and have a long service life.


Q2. What are sintered metal powder filters?

A: Sintered metal powder filters are manufactured by pressing metal powders into porous sheets or tubes and then sintering them at high temperatures. the combination of powder size, pressing and sintering operations of Sintered metal powder filters determines the pore size and distribution, strength and permeability of the porous element. The pore size of Sintered metal powder filters is determined using ASTM E-128. The media class designation corresponds to the average flow pore or average pore size of the filter. sintered metal powder filters are available in classes 0.1, 0.2, 0.5, 1, 2, 5, 10, 20, 40 and 100. liquid filtration classes for media classes 0.2 to 20 range from 1.4 to 35 µm absolute. Filtration grades in gases range from 0.1 to 100 µm absolute.

The sintered metal filter elements made of sheet or tube have a fully welded construction. The filter media is designed and manufactured with a stable porous matrix, precise bubble point specifications, tight thickness tolerances and uniformity of permeability to ensure reliable filtration performance, effective backwash cleaning and long operating life.


Q3. What are the design considerations for the sintered porous metal filter?

A: When selecting a sintered porous metal filter, please consider the required particle retention rate, the flow rate through the filter, working fluid, etc. Our previous blog posts on filter design considerations focused on specific applications, such as fuel filters and hydraulic oil filters in industries such as aerospace, defense and marine. When considering sintered metal filters more specifically, you need to be aware of the following.

Pore Size - Also known as the micron rating, the pore size defines the size of particles you want to eliminate. If the filter has an "absolute" rating of 5 microns, this means that 99% of all particles over 5 microns will be blocked. If you specify a 5 micron "nominal" rating, you will allow a larger percentage of 5-micron particles to pass, perhaps as much as 60%.

Pressure drop - This is the pressure loss that occurs when a liquid or gas flows through the filter. You must determine what your particular application will allow and assign it to a porous metal filters supplier.

Temperature range - How hot or cold the filter will work. The metal alloy you choose for the filter must be able to withstand it.

Strength - Sintered filters are an excellent choice when high strength is required. Another advantage is that they provide the same level of strength in forward or reverse flow.


Q4. Where are porous metal filters used?

A: Any pressure-driven filtration process with high operating costs in applications with consistently high temperatures and corrosive environments can be improved with sintered metal filtration technology. Suitable applications can be found in oil refineries, chemical and petrochemical processes, semiconductor processes and pharmaceutical production.


Q5. What are the material options for the sintered porous metal filter?

A: Commonly available are bronze, stainless steel and various alloys. Bronze is the most popular and lowest-cost alloy metal used for sintered filters. Reasons you may need to choose other metal types or alloys may be for higher strength, better corrosion resistance, or higher temperature applications. Stainless steel is another popular material that offers excellent heat and corrosion resistance - 316L stainless steel works best.

For more extreme environments, nickel alloys may be required. Options include Monel, Hastelloy and Inconel alloys. Indeed, each of these alloys has a high cost, due to the fact that they are more difficult to machine and their base composition is a more expensive metal.


We are a porous metal filter element supplier, please feel free to contact us if you need them.

Catherine Wang

Joined on 01, Jun 2022  

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