Can chemical filters remove formaldehyde?

Yes, but only if you choose the right medium.

The situation of formaldehyde is a bit special. It is a volatile organic compound, but its molecules have strong polarity and small molecular weight, and have different properties from common benzene and alkane solvents. Ordinary activated carbon has limited adsorption capacity for formaldehyde , because the adsorption of formaldehyde on the surface of activated carbon is weak and easy to penetrate. Treating formaldehyde usually requires specially treated media, or specialized chemical adsorption materials.

Another difficulty is that the release of formaldehyde is often continuous, low concentration, and long-term . Decoration materials, adhesives, and certain production materials may continue to be released for months or even years. This means that the filtration scheme should not only look at the initial removal efficiency, but also the long-term capacity performance. For specific selection logic, please refer to Discussion on why chemical filters should be selected according to the target gas .

Investigate the source of sustained release

The first step in formaldehyde control is to understand where it comes from and the rules of its release.

decoration materials. Urea-formaldehyde resin glue used in artificial boards, plywood, and density boards is a common source of indoor formaldehyde. This type of release usually lasts for a long time, with a high concentration in the early stage, and gradually decays but does not disappear completely in the later stage.

Adhesives and coatings. Certain glues, sealants, and wall coatings may release formaldehyde during the initial stages of use.

Production materials. Some industrial materials, cleaning agents or processes may also involve the release of formaldehyde.

Release is affected by temperature and humidity. When the temperature and humidity increase, the rate of formaldehyde release may increase. Therefore, testing and evaluation must cover different seasons or different working conditions. For specific sampling methods, please refer to whether to do air sampling before choosing a chemical filter . Discuss

Inspection report corresponding conditions

When selecting a model, make sure the data on the product information is for formaldehyde.

The test gas must be specified. The report should indicate that the target gas is formaldehyde, and state the test concentration, air volume, temperature and humidity conditions. Data for other VOCs (such as toluene, xylene) cannot directly replace the verification results of formaldehyde. The molecular properties of different organic substances are quite different, and the media applicability is not necessarily the same. For specific report interpretation methods, please refer to Discussion of why chemical filter performance reports list specific target gases .

Focus on capacity and penetration time. Formaldehyde has a long release cycle, and the capacity of the filter determines how long it can last. High initial efficiency does not mean sufficient capacity. When selecting a model, you need to know how long it will take to need to be replaced under the target concentration and air volume. For specific life assessment methods, please refer to Discussion of how long chemical filters last .

Temperature and humidity conditions need to match. The performance of some media may change in high temperature or high humidity environments. involving MAU box-type chemical filter , the position of the filter section will affect the actual temperature and humidity conditions. For the fresh air project of

Pay attention to subsequent changes

Formaldehyde concentration is not fixed and needs to be tracked during operation.

Increased temperature may result in increased outlet concentrations. If the filter has been running for a period of time, the media is close to consumption, the release volume increases when the temperature rises, and the outlet concentration may exceed expectations. This is not a sudden failure of the filter element, but that the capacity is close to the limit.

Exit inspections should cover representative conditions. For example, during high temperature periods in summer, peak production periods, or periods with poor ventilation conditions. Only taking a low reading once does not guarantee long-term compliance.

Regular testing is more important than one-time acceptance. For continuously released pollution sources, it is recommended to detect the outlet concentration periodically and determine the replacement timing based on the operating time and load records. Device-side applications such as The FFU is equipped with a chemical filter or internal protection of the equipment, and the location of the sampling point must be confirmed based on the equipment structure.

Project judgment example

After a certain office area was renovated, formaldehyde could still be detected under ventilation conditions.

Preliminary plans use conventional activated carbon filters. After running for a period of time, it was found that the outlet concentration did not drop significantly. Investigation and confirmation: Ordinary activated carbon has limited adsorption capacity for formaldehyde, and the medium itself is not configured for formaldehyde.

Adjust the direction: First confirm the main release sources (decoration materials, furniture, etc.), and evaluate source control and ventilation measures. Then, based on the detected formaldehyde concentration and air volume, select a chemical filter medium with formaldehyde suitability. After the trial, it is confirmed that the outlet concentration reaches the target, and then the formal plan is determined.

This case shows that formaldehyde requires a targeted media solution, and ordinary activated carbon cannot automatically meet the requirements. involving When selecting the chemical filter product series , it is recommended to provide the target gas and working conditions to the supplier for verification.

Key points for selection and acceptance inspection

About Aili Industrial’s formaldehyde filtration package

The core of formaldehyde filtration is to match the release source, concentration, temperature, humidity and air volume, and then select the matching media and structure.

Aili Industrial has independent manufacturing capabilities in filters, motors, fans, control systems and sheet metal processing, and can provide chemical filter product series and supporting air supply equipment. For projects that need to deal with formaldehyde or other VOCs, we can help check the filter material type and structural configuration based on the release source characteristics, concentration range, environmental conditions and installation space. When the filter is matched with MAU, FFU, EFU and other equipment, the resistance, interface and maintenance methods can be confirmed uniformly.

Related products:Chemical filter product series、MAU box chemical filter、FFU comes with chemical filter . Providing target gases, concentration ranges and system conditions when inquiring can help confirm the appropriate filtration solution. The specific selection is subject to the technical documents and test results confirmed by the project.