Basic Performance Data and Applications of High-Temperature Separator HEPA Filters in Air Filtration Equipment

Basic Performance Data

1. Core Technical Parameters

Performance parameter | Typical value | Technical characteristic

Filtration efficiency | H13 under EN 1822: at least 99.97% for particles ≥0.3 μm; H14: at least 99.995% | Ultrafine glass-fiber paper 0.03–0.05 mm thick is combined with aluminum separators to form dense pleats. The media area is three to five times that of a panel structure.

Temperature resistance | Continuous operation at 250°C and short-term exposure at 300°C with red high-temperature silicone sealant; special models can operate continuously at 350°C with black high-temperature inorganic adhesive | A stainless-steel frame 1.5–2.0 mm thick and a heat-resistant sealant such as silicone rubber maintain structural stability and prevent seal cracking or media deformation.

Initial and final pressure drop | H13 initial pressure drop ≤220 Pa at a face velocity of 0.5 m/s; recommended final pressure drop 400 Pa, with replacement before dust capacity is exhausted | Corrugated separators distribute airflow uniformly and create 15%–20% less resistance than a separatorless structure.

Dust-holding capacity | 500–800 g/m² for H13 using standard test dust | Aluminum separators spaced 4 mm apart create wedge-shaped pleats that hold dust effectively and resist clogging.

Airflow range | 500–3,000 m³/h per unit; for example, a 610 × 610 × 120 mm model is rated at 620 m³/h | A strong stainless-steel frame withstands air velocity above 3 m/s.

Seal integrity | Leakage rate ≤0.01% in a sodium-flame test | A dual seal consisting of sealant and a silicone-rubber gasket prevents leakage at high temperature.

2. Key Materials and Construction

• Filter media: Imported ultrafine glass-fiber paper, such as the HV series, treated to prevent volatilization and fiber shedding at high temperature.

• Separators: Corrugated 0.03 mm aluminum foil with spacing controlled precisely at 4 mm to keep the pleats uniform.

• Frame: 1.5 mm 304 stainless steel or powder-coated galvanized steel with strong corrosion resistance.

• Sealant: Silicone rubber rated to 250°C or ceramic-based inorganic adhesive rated to 350°C. A curing period of 3–7 days is required to prevent cracking at high temperature.

3. Certification and Test Standards

• International standards: EN 1822 in Europe, ISO 16890 internationally, and ASHRAE 52.2 in the United States.

• Chinese standard: GB/T 13554-2008, High Efficiency Particulate Air Filter, using the sodium-flame test.

• Industry certification: Some models are certified for FDA GMP applications and are suitable for high-temperature sterilization in pharmaceutical manufacturing.

Practical Applications

1. High-Temperature Industrial Equipment

• Ultra-clean ovens and tunnel furnaces: Filter hot air during sterilization of electronic components and medical devices at 180–250°C, removing dust and microorganisms to maintain product sterility.

• Typical example: A semiconductor plant uses a 250°C-rated H14 model to filter hot drying air in a wafer-cleaning system and prevent particles from contaminating wafer surfaces.

• Automotive paint-curing booths: Filter 180–220°C curing air and capture paint-mist particles that could otherwise create pinholes or bumps in the finish.

• Chemical-reactor exhaust: Filter exhaust at 200–300°C, removing catalyst dust and organic vapors and protecting downstream treatment equipment.

2. High-Temperature Clean Applications in Pharmaceutical Manufacturing

• High-temperature sterilization tunnels: Filter air in the cooling section of systems sterilizing vials and rubber stoppers at 300–350°C, maintaining Grade A cleanliness.

• Aseptic filling-line ovens: Filter dry sterilization air at 250°C and prevent heat-resistant Bacillus spores from contaminating medicines.

• Active-pharmaceutical-ingredient drying rooms: Filter 200°C drying air, capture API powder, and prevent cross-contamination.

3. Food and Packaging Industries

• High-temperature baking equipment: Filter 150–200°C process air, remove flour particles and oil fumes, and support QS and HACCP requirements.

• Aseptic packaging lines: Filter 220°C air used to sterilize packaging materials, supporting seal integrity and microbiological compliance.

• Dairy drying towers: Filter 250°C drying air and prevent metal fragments or fibers from entering milk powder.

4. Electronics and Semiconductor Manufacturing

• Wafer photolithography areas: Filter 180°C clean-oven air and protect photoresist coating from particle contamination.

• LCD panel curing furnaces: Filter 200°C UV-curing air, capture resin fragments, and improve panel light transmission.

• LED packaging equipment: Filter 250°C air in die-bonding ovens and prevent silver-epoxy particles from clogging dispensing nozzles.

5. Specialized High-Temperature Environments

• Radioactive exhaust treatment at nuclear power plants: Models rated to 350°C filter hot exhaust generated during reactor maintenance and capture radioactive aerosols.

• Aerospace component cleaning: Filter exhaust from supercritical CO₂ cleaning equipment at 280°C, recovering CO₂ while removing metal particles.

• Glass-melting furnace exhaust: Special models filter furnace exhaust at 400°C, removing silica dust and heavy-metal oxides to meet environmental-emission requirements.

Advantages Compared with High-Temperature Separatorless HEPA Filters

Comparison factor | High-temperature separator HEPA | High-temperature separatorless HEPA

Maximum temperature | 350°C with inorganic adhesive | 250°C with hot-melt adhesive

Structural stability | Aluminum separators support the media and resist collapse at high temperature | Hot-melt separators may soften and deform at high air velocity

Dust-holding capacity | High, 500–800 g/m² | Medium, 300–500 g/m²

Maintenance cost | Long replacement interval of 6–12 months | Short replacement interval of 3–6 months

Suitable environment | Hot, humid, and dusty conditions | Moderate temperature and low dust concentration

Selection and Operating Recommendations

Select the Model by Temperature

• Below 250°C: Prefer a lower-cost H13 filter sealed with red silicone.

• From 250°C to 350°C: Use an H13 or H14 filter sealed with black inorganic adhesive and verify that the adhesive has cured for the required period.

Installation Precautions

• After installation in hot equipment, raise the temperature gradually. For a model rated to 250°C, for example, increase from 100°C to 250°C in stages and hold each stage for one hour. This prevents the seal from cracking under thermal stress.

• Use a silicone-rubber sealing gasket 3–5 mm thick to prevent leakage between the frame and the equipment connection.

Monitoring and Replacement

• Install a differential-pressure gauge for continuous resistance monitoring and replace the filter when pressure drop reaches twice its initial value.

• In a hot environment, inspect media integrity every quarter, for example by scanning with a particle counter.

With stable construction and high filtration efficiency at elevated temperatures, the high-temperature separator HEPA filter is a core component for clean hot-air applications. It is especially important in high-value pharmaceutical, electronics, and food manufacturing. The correct model must be selected for the operating conditions and installed and maintained according to the specified procedures to ensure compliant performance.