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Cleanroom Air Filters Material Composition and Operating Conditions

In modern cleanrooms, laboratories, pharmaceutical facilities, and precision manufacturing environments, maintaining ultra-clean air is essential. Air filters serve as the core component of cleanroom HVAC systems, providing effective particle control and ensuring that the indoor environment meets strict cleanliness standards. This article explains the purpose of air filters and presents the material composition, operating conditions, and key performance parameters of high-efficiency cleanroom air filters.

1. Purpose of an Air Filter in a Cleanroom

The primary purpose of an air filter is to remove airborne contaminants and maintain a controlled environment. In cleanroom applications, air filters provide the following functions:

1.1Particle Removal

High-efficiency air filters—such as HEPA (H13/H14) and ULPA—capture ultrafine particles, including dust, spores, aerosols, and microorganisms, preventing them from entering the workspace.

1.2 Protection of Cleanroom Processes

Sensitive operations such as semiconductor processing, pharmaceutical production, pathology experiments, and medical device assembly rely on purified air to avoid product defects or contamination.

1.3 Consistent Air Quality

Air filters maintain stable airflow patterns and pressure levels, which are essential for cleanroom classification and compliance with ISO and GMP requirements.

1.4 Equipment and Personnel Protection

Filtration helps prevent hazardous particles, biological agents, and chemical residues from circulating in the work area, improving occupational safety.

2. Cleanroom Air Filters: Material Composition

Cleanroom HEPA filters are engineered with durable materials designed for high-efficiency filtration under strict environmental conditions.

**● Filter Media:

Ultrafine Fiber Glass Filter Paper with Aluminum Frame**
The fiberglass filter media provides exceptionally small fiber diameters, enabling capture of ≥99.95% (H13) to ≥99.995% (H14) of particles sized 0.1–0.3 microns. The aluminum frame enhances rigidity and prevents deformation.

**● Dividers:

120 g/m³ Adhesive Paper or 0.035 mm Aluminum Foil**
These dividers ensure uniform spacing of the filter layers, optimizing airflow distribution and maximizing effective filter area.

**● Sealing Strip:

EVA or Melt Adhesive**
The sealing strip provides an airtight connection between the filter frame and the filter housing to prevent bypass leakage.

**● Sealant:

PU Two-Component Polyurethane AB Adhesive**
High-strength PU sealant ensures long-term bonding of filter media and frame, even under fluctuating environmental conditions.

**● Filtration Efficiency Levels:

H13 / H14**

H13: ≥99.95% particle capture efficiency

H14: ≥99.995% particle capture efficiency

3. Operating Conditions of Cleanroom Air Filters

Cleanroom filters must operate within specific environmental limits to maintain performance and protect the integrity of the filter material.

● Maximum Operating Temperature:70°C

● Maximum Relative Humidity:80%

These conditions ensure the structural stability of the fiberglass media and adhesives, preventing filter deformation or reduced efficiency.

4. Cleanroom Air Filters Technical Parameters

The following are key performance specifications of cleanroom HEPA filters, including size, rated airflow, filtration area, efficiency, and resistance.

Cleanroom Air Filters Parameters

Note: Higher airflow values require a larger filter area to maintain low resistance and stable system performance.

5. Conclusion

Air filters play a vital role in ensuring cleanroom safety, product quality, and stable airflow control. With high-efficiency fiberglass media, durable construction, and strict operating limits, HEPA filters such as H13 and H14 are widely used in pharmaceutical cleanrooms, electronics plants, medical laboratories, and precision workshops.

Understanding the material composition and performance parameters helps buyers select the right air filters based on airflow, efficiency, and cleanroom classification requirements.