Porous Plastics

Porous Plastic Manufacturing Specialist Serving the World

Filson porous plastics are ideal and versatile solutions for a variety of applications, from drug delivery, laboratory, chromatography to medical and healthcare. Typically we supply kinds of porous polyethylene, porous polypropylene, porous PTFE, high density polyethylene, ultra-high molecular weight polyethylene… base materials and end products.

Filson owns an exclusive manufacturing site and a team of porous plastic experts, specialising in designing and manufacturing of porous plastics. Empowered by 20 years of experience in filtration field, we are always committed to providing value and complete filtration solutions for our customers.

Porous Plastic Tube
Filson porous plastic tube has a hollow structure, can be manufactured from non-toxic and odourless materials for use in food or various industries requiring safe materials. Custom lengths and diameters available.
Porous Plastic Rod
Filson porous plastic rod is quite similar to porous plastic tube, but different from the hollow tube, it’s solid. It can satisfy multiple use of your application. Experiencing a sintering process, the plastic is bonded closely together to support your business.
Porous Plastic Sheet
Filson porous plastic sheet can provide micron ratings from 5 to 200 μm with 99.8% filtration efficiency. Hydrophilicity or hydrophobicity can be obtained with special treatments. And Filson porous plastic sheet can be used as an alternative to Porex sheet.
Porous Plastic Disc
Filson provides reliable porous plastic disc for our customers around the world. Commonly, our quality porous plastic discs are able to support all kinds of your application purposes, such as filtration, diffusion and purification.
Porous Polyethylene
Filson porous polyethylene (PE) is the most commonly used material of almost all sintered plastic types, with stable chemical resistance and wide pore size ranges. Also porous HDPE (high density polyethylene), porous UHMWPE (ultra-high molecular weight polyethylene) materials can be provided.
Porous Polypropylene
Filson porous polypropylene (PP) is more fitted for applications requiring larger pore sizes and higher strength, can be shaped into tube, rod, disc, sheet, etc. The porosity of Filson porous polypropylene is approximately 35 - 40 % void volume.
Porous PTFE
Filson porous PTFE (Teflon/F4) features higher performance than other polymers, especially for better resistance to corrosion. Frequently used for a variety of diffusion, filtration, muffling, wicking, venting applications.
Porous Plastic Filter
Filson porous plastic filter, alaso called sintered plastic porous filter, can be manufactured in a variety of porous plastics materials. It features lightweight, aesthetically pleasing without losing required mechanical strength.
Porous Glass Frit 
Filson porous glass frit is one of our satisfactory design work. It is formed from a vacuum sintering process under a specific temperature. By doing this, the glass frit is featured by uniform pore distribution to filter sample in chromatography system.

Why Choose Filson Porous Plastics

Filson strives to develop creative designs and advanced manufacturing technologies for plenty of complex applications. For 20 years, Filson has served hundreds of customers from over 40 countries and regions and with prestigious reputation.

  • Reliable – high purity raw materials for high quality production
  • Specialist -20 years of extensive engineering experience
  • Innovative – custom specifications available for various applications
  • Certified – a series of relevant certificates like ISO 9001, CE, FDA
  • Sincere – technology support throughout pre-sale to after-sale
  • Competitive – ex-factory prices to provide cost advantage for you

Filson: Your Ideal Porous Plastic Manufacturer in China

Filson porous plastics are strong, self-supporting polymers formed through high-temperature vacuum sintering. This process of particle fusion gives it a porous structure, therefore can achieve your desired filtration result with particular pore size and porosity.

Filson porous plastic productions

Filson porous plastics provide a wide range of shaping possibilities, common shapes are rods, tubes, sheets, discs, or upon your request. These all feature light weight and simple construction, contributing to your installation or replacing.

Whether Filson porous plastic tubes, Filson porous plastic sheets or other Filson porous plastic filter models with complex shapes, they all can provide outstanding muffling, diffusion, wicking, filtering, venting, and membrane support capabilities.

Filson porous plastic tube

From polyethylene (PE), polypropylene (PP), PTFE, to high density polyethylene (HDPE), ultra-high molecular weight polyethylene (UHMWPE), Filson porous plastics materials are highly resistant to most acid and alkali solvents. We can recommend a suitable material for you depending on the chemical properties of your filter media.

Standard Filson porous plastics deliver wide pore size ranges from 1 to 100 microns with 25-65 % porosity, or specially designed upon your need. Besides, Filson porous plastics can normally withstand 200 – 300 ℉ temperatures in the absence of any additives.

porous plastic frit for your application needs

Both standard and custom models are part of our range of supply. Filson has an experienced design team to enable every custom requirement with innovative designs, and CAD drawings can be provided for reference after your specific technical data delivery.

Filson also develops multifarious composites made from a combinations of base porous plastics and additives, which are ideal for pipette tip filters, SPE frits, catheter vents, fluid collection vents, etc. There are some unique advantages in pore size and flow rate controlling from composites.

porous plastic manufacturer

If you need, Filson porous plastics can target hydrophilic, hydrophobic, or self-sealing properties with different treatment. We are always committed to designing perfect and complete solution by our advanced manufacturing technology and correct material selection.

Filson porous plastics is cleanable and reusable with high durability, supporting several cleaning methods. You are suggested to utilize physical or chemical ways for cleaning your porous plastic filters to restore the original efficiency of 99.8%.

porous plastic rod


*Physical cleaning methods: backflush with fresh water or backblow by compressed air

*Chemical cleaning methods: soak in an acid or alkali solvent to neutralise the contaminants

Compare to other porous plastics manufactures, Filson strengths lie in our competitive prices, ex-factory prices, and ISO 9001 certified quality excellence. No matter you are a new customer or existing customer, we promise to give you best price corresponding to the quantity of your order.

porous plastic serving your application

Of course, being our long-term customers will enjoy additional benefits. Filson would like to build strong, long-lasting partnerships with you sincerely and won’t let you down.

Each of Filson porous plastic filters will experience a aeries of strict tests such as bubble point test by our specialised equipment. Thus we can ensure that the porous plastic filters we produce meet the micron rating, flow rate, pressure capacity… you required.

sintered porous plastic for filtration

Filson packs porous plastics products in plastic film and specially tailored cartons and wooden cases to avoid any damage during whole transportation. In addition, we work closely with several popular logistic companies for minimising your receiving time.

Moreover, Filson has a full stock of standard porous plastics for your urgent or large quantity order and we can arrange immediate delivery. And for bespoke models, we will deliver within 1-2 weeks. OEM/ODM service is always available.

Not only sintered porous plastics, Filson also focus on offering diversified bonded fibers, open-cell foam, borosilicate glass fiber to satisfy different industries. Please do not hesitate to contact us if you have any requests. Filson technology support is always here for your filtration project.

Please use our contact information:

Phone: 86 – 157 3695 8886


Any doubt or interest of Filson porous plastics, feel free to discuss with our engineer team.

An inquiry NOW!

Filson Porous Plastic Features

  • High purity materials with relevant certificates
  • Easy to install and remove for less downtime
  • Precisely controlled pore sizes with reliable performance
  • High porosity design with high air permeability
  • Hydrophilic, hydrophobic, or self-sealing properties
  • Excellent chemical resistance to most acid&alkali solvents
  • Light weight and simple structure without losing high strength
  • Available in wide range of applications with high efficiency

Filson Porous Plastic Specifications

  • Raw Material: polyethylene (PE), polypropylene (PP), PTFE
  • Operating Temperature (℉): 200 – 300 (Max. 500℉ in special circumstance)
  • Pore Size (μm): 1 – 100
  • Thickness (mm): 0.75 – 6
  • Filtration Efficiency: up to 99.8 %
  • Porosity: 25 – 65 %
  • Shape: rod, tube, sheet, disc, ring or complex shapes

Note: above list is for reference purpose only, customization available.

Filson Porous Plastic Applications

  • Biotechnology
  • Pharmaceutical
  • Life science
  • Laboratory
  • Chemical
  • Chromatography
  • Medical
  • Automotive
  • Aerospace

Filson Porous Plastics FAQ:

What is Porous Plastic?

Porous plastic ( here refers to sintered porous plastic ), in simple terms, is a breathable and versatile material applied to various sorts of industrial applications and commercial use. It can be adopted in a lot of different products to achieve different purposes.

Porous plastic is a durable, flexible component that can control the flow of gases, liquids, light or sound by fusing particles together to create this porous and permeable structure. There are numerous micron pores inside and outside the surface of the material to support the function realizing.

You may have a better understanding by giving an example: air freshener is one of its typical application. By using a porous plastic product, the liquid fragrance is slowly diffused into the air. The porous plastic here plays an important role in controlling the flow of liquid.

Filson porous plastics

What Materials can be Used for Manufacturing Porous Plastics?

Porous plastics are made of strong and self-supporting polymers. To reach specific aim and satisfy different application needs, porous plastics can be manufactured using a variety of materials.

The selection of the material is vital to the final performance of the product. You are suggested to choose the right material based on the needs of the end product and your requirements. What’s more, it is a key part to the initial design and engineering process.

The following materials are most frequently used in manufacturing, check and see if they are your desired materials:

1. Polyethylene ( PE )

Polyethylene is the most commonly used material in producing porous plastic product. It has a wide range of micron ratings ranging from 5 micron to 250 micron. Sintered PE can be used in a variety of applications for higher end processing.

2. Polypropylene ( PP )

Polypropylene is suitable for strong applications where need large pore size and robust structure. Standard pore size of sintered PP ranges from 100 micron to 300 micron which can satisfy your specific needs.

3. Polytetrafluoroethylene ( PTFE )

Polytetrafluoroethylene is ideal for applications in need of high temperature and corrosion resistance ( able to withstand high temperature up to 400℉). Besides, sintered PTFE can be made more precisely with accuracy of <1 to 60 micron.

Except for the three materials listed above, polyvinyllidene flouride ( PVDF ), high density polyethylene ( HDPE ), ultra-high molecular weight polyethylene ( UHMWPE ) are also available to be porous plastic materials based on your product’s need.

Contact our professional engineer to define your specifications and select the most suitable material for your application.

How do You Make Plastic Porous?/What is Plastic Sintering?

Porous plastic is made by a form of sintering. During the sintering process, various porous materials are bonded together by heat and with or without pressure to produce the porous structure.

The temperature of sintering is strictly controlled, so that the plastic material won’t fuse before reaching its melting point.

Basically, three steps are required when make porous plastics:

  1. Mount the target material into the mold
  2. Add proper pressure and control proper temperature
  3. Demould and you will get a compactly constructed product

As one of the leading manufacturers of porous plastic products for air, gas, oil and water in China, Filson designs and engineers plenty forms of porous plastic including standard and custom plastic sheets, rods, discs, tubes and rings.

sintering process of porous plastics

What is a Sintering Process?

Sintering has another name called frittage. You may easily get the point of the meaning as the name implies. Sintering is a process to form solid mass including powder, fiber and mesh into a whole to realize the end product’s needs.

The materials experiencing the sintering process will be heated and pressed without melting to the point of liquefaction. The atoms in the materials move, diffuse and finally fuse together into one piece. Sintering can occur naturally in mineral deposits, at the meantime, it is applied to manufacture products using ceramics, metals and plastics.

what is sintering process

What are the Functions of Porous Plastics?

Porous plastics are so versatile that can be used for all sorts of industrial applications, including chemical industry, pharmaceutical industry, biotechnology, water treatment, chromatography system and aerospace field.

To be specific, porous plastics have the following functions:

1. Filter

Filtration is a basic and crucial benefit brought by porous plastics. In the fields of healthcare and pharmaceutical industry, filtration property is extremely important to reduce cross-contamination issues. Meanwhile, water, oil, air and gas can also be filtered using sintered porous plastic.

2. Wick

Air freshener has to keep a long lasting and consistent performance to deliver stable fragrance to the air. And this can be achieved by using porous plastic products. Customizable solutions are able to realize.

3. Vent

Those sensitive electronics like semiconductors require a high quality and clean manufacturing condition which means they need a component to keep out dust and dirt. Porous plastics are the premier choice. Our materials can be used as fuel cell vents and holding media of separator and isolator.

4. Diffuse

Sintered porous plastics can be used to diffuse gas to the target liquid to accomplish the particular reaction or supply the specific gas to the process liquid to carry on the following step.

In addition to the advantages above, sintered porous plastics are available to be applied to restrain flow and velocity of the fluids to create a uniform flow and a quality product that serves your application.

sintered porous plastic water filter tube

How to Choose the Right Porous Plastics?

When it comes to choose the right porous plastics, you are recommended to take multiple factors into consideration. In order not to affect the final product efficiency, you can view these as reference:

1. Pore size

Pore size is the filtration accuracy of your porous plastic. It defines the size of voids in the porous media. Also, it determines the results of the filtration.

2. Porosity

Porosity of porous plastic is a key factor to product manufacturing. The porosity impacts the absorption volume and flow resistance of your part.

3. Working temperature

Be clear about the operating temperature of your processing system. And choose right materials according to the actual conditions.


operating temperature of some materials:

PE: 180℉ PP: 250℉ PVDF: 300℉ PTFE: 400

4. Chemical properties

Quality sintered porous plastics suit almost all environments, but it is still necessary to check if the product will react with some chemicals.

5. With or without annexing agent

If needed, additives and treatments can be used for manufacturing to bring more possibilities, you can contact Filson for more information.

6. Application

Last but not least, the final sintered porous plastic product is going to serve the target application, which means knowing well about your application is quite critical.

Just send the specifications of your required porous plastic and our experienced specialists will give you a satisfactory answer within 8 working hours. If you have some questions, you can also feel free to consult us.

Send Your Inquiry Today
Scroll to Top