Washable Activated Carbon Odor Filter (Adhesive Carbon Type)

This washable activated carbon odor filter is a finished filter made by bonding activated carbon onto a flexible polyurethane sponge. It captures coarse particles such as hair and dust while adsorbing formaldehyde, benzene, ammonia and other odorous gases. It is designed for air purifier pre-filters, fresh air systems, car cabin filters, central air return grilles and industrial vacuum cleaners, and it is available from Oltaven as a customizable OEM/ODM product.

From Media to Finished Filter

Activated carbon has a huge internal surface area, but loose powder or granules cannot be used directly in an appliance. The media must be fixed in place so air passes through it evenly and the carbon stays put during handling, installation and washing. That is the role of the finished filter: it turns carbon into a stable, mountable part with predictable airflow and service life.

Oltaven bonds selected activated carbon onto a polyurethane sponge base. The sponge gives the filter its shape and flexibility; the carbon provides the adsorption. The bonding process must keep the carbon exposed to the air stream while preventing it from rubbing off. A filter that sheds carbon loses capacity quickly; one with blocked pores creates too much resistance. The finished product balances these two risks.

Because the carbon is bonded rather than simply enclosed, the filter can be rinsed and reused. Water flows through the open sponge structure and carries away captured dust, leaving the bonded carbon in place. This washable design reduces the cost of replacement compared with single-use filters. The same construction also acts as a pre-filter, protecting downstream filter stages from coarse debris.

What Decides Finished Performance

Three factors determine how a finished carbon filter performs: the carbon itself, the way it is bonded, and the physical form of the filter.

Carbon selection. The grade and loading of activated carbon set the adsorption capacity for gases such as formaldehyde, benzene and ammonia. Higher carbon loading generally means more capacity, but it can also increase resistance if the carbon fills the open pores of the sponge. The right balance depends on the target gas and the allowable pressure drop.

Bonding quality. The adhesive must hold carbon particles securely without sealing their pores. If the bond is too weak, carbon dust migrates into the air stream and the filter loses capacity. If the bond is too heavy, it coats the carbon and reduces adsorption. Oltaven controls this step so that the finished filter keeps its carbon through repeated washing.

Forming and dimensions. Thickness, pore density and overall size affect both airflow and contact time. A thicker filter or a finer pore structure gives more contact time for adsorption but raises resistance. The filter can be die-cut into circles, squares or custom shapes to fit specific housings. Edge quality matters: clean cuts prevent loose carbon at the edges and ensure a proper fit.

Together, these choices explain why two filters of the same size can behave differently. A filter with well-exposed carbon and an open structure will have lower resistance and higher usable capacity than one where the carbon is overcrowded or the pores are blocked. The finished filter, not the raw media alone, is what determines real-world efficiency, resistance and capacity.

Applications

The washable activated carbon odor filter is used where both coarse dust and odorous gases need to be handled in a thin, flexible layer. Typical installations include:

• Air purifier pre-filtration, where it protects the main filter and reduces odors.
• Fresh air ventilation systems, as a pre-filter for outdoor pollutants and odors.
• Car cabin air filters, for odor removal in compact spaces.
• Central air conditioning return grilles, to capture dust and reduce odors.
• Industrial vacuum cleaners, as an exhaust odor filter.

In each case, the filter can be washed and reused, which suits applications where regular replacement would be costly or inconvenient.

Technical Specifications

The Oltaven Factory and Certifications

Oltaven has more than 20 years of experience in filter development and manufacturing, with over 1,000 filter solutions developed for customers. Our 50,000 m² plant includes six cleanrooms covering 20,000 m², and our in-house laboratory is CNAS-accredited and can issue test reports for filtration efficiency, dust holding capacity and resistance. We are certified to IATF 16949 (2024), ISO 9001, ISO 14001 and ISO 45001, and our products meet REACH and RoHS requirements with compliance documents available. We have exported to Europe, the United States, Japan and South Korea for more than 20 years.

OEM/ODM Workflow

1. Requirement review. Share your device model, target size or drawing, airflow or water flow, operating conditions and estimated quantity.
2. Feasibility and proposal. We confirm carbon grade, thickness, pore density and shape, and propose a specification.
3. Sampling. Custom samples are typically ready in 7–15 working days; standard samples ship in 1–3 working days.
4. Validation. You test the sample; we can support with CNAS laboratory data on adsorption, resistance and wash durability.
5. Production. After sample approval, orders are scheduled; custom orders typically ship in 25–35 days.
6. Quality control. IQC, IPQC and OQC checks cover incoming carbon, bonding uniformity, dimensions and final performance.

Start a Custom Project

To quote accurately, please tell us your device or vehicle model, the required size or a drawing, the airflow or water flow, the operating conditions (temperature, humidity, gas type) and your estimated quantity. We will respond with a specification and sample plan. Contact Oltaven to start the conversation.