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Contact The Oltaven washable activated carbon sponge filter is a flexible, reusable filter that combines coarse particle capture with adsorption of formaldehyde, benzene, ammonia and other odorous…
FILTER MEDIA / ROLLS · SHEETS · DIE-CUT
The Oltaven washable activated carbon sponge filter is a flexible, reusable filter that combines coarse particle capture with adsorption of formaldehyde, benzene, ammonia and other odorous gases. It is made from polyurethane sponge loaded with specially fixed activated carbon, and it is designed for air purifier pre-filters, fresh air systems, car cabin filters, central air return grilles and industrial vacuum cleaners. Oltaven supplies the finished filter in custom thicknesses, pore densities and shapes, not just the raw media.
Activated carbon is good at trapping gas molecules, but on its own it is a powder or fine granule that is difficult to handle and easy to lose in an air stream. The finished filter solves that by fixing the carbon inside an open-cell polyurethane sponge. The sponge holds the carbon in place, gives the filter a stable three-dimensional shape, and lets air pass through with low resistance. The result is a filter that can be washed, cut and fitted into compact equipment without shedding carbon.
The choice of sponge and carbon grade sets the starting point, but the finished performance comes from how the two are combined and formed. A higher carbon loading generally gives more adsorption sites, while a more open sponge structure keeps resistance low. Oltaven balances these factors for each application, so the filter delivers the intended airflow and odour control in the device where it will be used.
Three things decide how a carbon sponge filter performs in practice: the media, the forming, and the way it is sealed into its housing.
Media choice. The activated carbon grade and loading determine how much gas the filter can adsorb. The sponge’s pore density, measured in pores per inch (PPI), affects both airflow and the amount of carbon that can be held. A denser sponge may hold more carbon but can raise resistance, so the right balance depends on the fan and the space available.
Pleating and shaping. Unlike pleated paper filters, this product is a flexible sponge. Forming therefore means cutting, stamping or die-cutting the sponge to the required outline and thickness. Oltaven can supply thicknesses from 3 mm to 50 mm and can produce circular, rectangular or irregular shapes. The forming step also sets the effective surface area exposed to the air stream, which influences both particle capture and gas adsorption.
Framing and sealing. A finished filter needs to sit securely in its housing so that air passes through the media rather than around it. Oltaven can add frames or edge treatments where required, and the sponge can be supplied with or without a frame depending on the application. The sealing method is chosen to suit the device, so the filter stays in place during use and can still be removed for washing.
Because Oltaven controls these steps in-house, we can adjust the finished filter’s efficiency, resistance and capacity to match a specific device. That is why two filters of the same size can behave differently: the difference lies in the carbon loading, the sponge structure, the forming accuracy and the sealing, not just the outer dimensions.
The washable activated carbon sponge filter is used wherever coarse dust and odours need to be handled together in a compact space. Typical applications include:
In each case, the filter can be washed and reused, which reduces consumable costs compared with disposable carbon filters. Its flexible sponge construction also makes it easy to fit into irregular spaces.
| Item | Detail |
|---|---|
| Product name | Washable Activated Carbon Sponge Filter |
| Core base material | Polyurethane sponge |
| Adsorbent material | High-quality powdered or fine granular activated carbon, fixed by a special process |
| Primary purification performance | Coarse filtration of large particles (hair, dust) plus adsorption of formaldehyde (HCHO), benzene, ammonia and other harmful gases |
| Physical structure advantages | Washable and reusable, very low air resistance, flexible and easy to cut, good air permeability |
| Main end-use applications | Air purifier pre-filter layer, fresh air ventilation system pre-filter, car cabin air filter, central air conditioning return grille, industrial vacuum cleaner |
| Specification and size customisation | Full OEM/ODM flexibility. Thicknesses such as 3 mm–50 mm, pore densities (PPI) and outline dimensions; stamping and forming services available |
| Quality certification | Produced in the company’s 20,000 m² cleanrooms; company holds ISO 9001, ISO 14001 and IATF 16949 certification |
Oltaven is a filter manufacturer with more than 20 years of experience in filter development and production. We support OEM/ODM projects and have developed more than 1,000 filter solutions for customers. Our plant covers 50,000 m², including six cleanrooms totalling 20,000 m², where filters for sensitive applications are produced.
Our in-house laboratory is CNAS-accredited and can issue test reports for filtration efficiency, dust-holding capacity and resistance. The company holds IATF 16949 certification (obtained in 2024) and ISO 9001, ISO 14001 and ISO 45001 system certifications. Products comply with REACH and RoHS requirements, and compliance documents can be provided. We have been exporting to Europe, the United States, Japan, Korea and other markets for over 20 years.
To receive a quotation or sample, please tell us your device or vehicle model, the required size or a drawing, the airflow or water flow, the operating conditions, and the quantity you expect to order. With those details, Oltaven can propose a finished filter that matches your performance and cost targets. Contact our team to begin.
Resistance depends on the sponge’s pore density (PPI), the amount of activated carbon loaded into it, and the thickness of the finished filter. A denser sponge or a higher carbon loading can improve adsorption but may increase resistance. Oltaven balances these factors for each application so the filter works with the device’s fan.
An OEM project starts with your requirements: device or vehicle model, required size or drawing, airflow, operating conditions and estimated quantity. Oltaven then recommends a sponge grade, carbon loading and thickness, and provides samples for your testing. After sample approval, we move to production.
Yes. Oltaven offers full OEM/ODM customisation, including thicknesses from 3 mm to 50 mm, various pore densities (PPI) and outline dimensions. We can produce circular, rectangular or irregular shapes by stamping or die-cutting, and we can add frames or edge treatments if needed.
The filter is washable and reusable. The replacement or washing interval depends on the application and how much dust and odour the filter is exposed to. In normal use, we recommend checking the filter regularly and washing it when you notice reduced airflow or odour control. Oltaven can help define a suitable maintenance schedule for your device.
Yes. For B2B customers with a clear purchase intention, we can provide stock samples free of charge, with the customer covering freight. For custom samples, a sample fee may apply depending on the development effort, and this fee can be deducted from the order value once you place a bulk order.
For standard specifications, the MOQ is typically 5,000–10,000 pieces. For custom specifications, the MOQ is generally 10,000 pieces, depending on material and tooling. Sample lead time is about 5–7 working days, and bulk delivery is usually 25–35 days after order confirmation and sample approval.
Oltaven follows IQC, IPQC and OQC checks throughout production, and key performance indicators are tested in our CNAS-accredited laboratory. The company holds IATF 16949 (obtained in 2024) and ISO 9001, ISO 14001 and ISO 45001 certifications. Products comply with REACH and RoHS requirements.
Please provide your device or vehicle model, the required size or a drawing, the airflow or water flow, the operating conditions, and the quantity you expect to order. With these details, Oltaven can propose a suitable finished filter and provide a quotation. <a href="/en/contact">Contact us</a> to start your project.