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Supplying original equipment manufacturer (OEM) round HEPA filter cartridges requires a clear understanding of the filtration mechanics that protect sensitive processes. This page outlines the
Request a QuoteSupplying original equipment manufacturer (OEM) round HEPA filter cartridges requires a clear understanding of the filtration mechanics that protect sensitive processes. This page outlines the engineering considerations that define cartridge performance, the material choices that influence longevity, and the validation steps that reduce procurement risk.
| Parameter | Typical Value | Customizable Options |
|---|---|---|
| Nominal Diameter | 300 mm | 200 mm – 500 mm (step 25 mm) |
| Height | 300 mm | 150 mm – 600 mm (step 25 mm) |
| Pleat Count | 120 pleats | 80 – 180 pleats (depending on media) |
| Media Type | Microglass fiber | Polyester, PTFE‑coated, hydrophobic blends |
| Efficiency (MPPS) | ≥99.97 % @ 0.3 µm | 99.95 % – 99.999 % (ULPA options) |
| Initial Pressure Drop @ 0.5 m/s | 120 Pa | 80 Pa – 200 Pa (media & pleat geometry) |
| Max Operating Temperature | 80 °C (continuous) | 120 °C (high‑temp media), –20 °C (low‑temp) |
| Frame Material | ABS plastic | Polypropylene, aluminum, stainless steel |
| Gasket Material | EPDM foam | Silicone, neoprene, PU foam |
The filter media determines both particle capture efficiency and resistance to airflow. Microglass fiber media provides a fine, uniform pore structure that achieves HEPA classification (≥99.97 % at 0.3 µm) while maintaining a low initial pressure drop. Alternative media such as polyester offer higher chemical resistance for solvent‑laden airstreams, whereas PTFE‑coated media add hydrophobic properties that reduce moisture‑related efficiency loss.
Efficiency is measured using the most penetrating particle size (MPPS) test method. For standard HEPA media, the MPPS lies near 0.3 µm, where diffusion and interception mechanisms are least effective. By tightening pleat spacing and optimizing fiber diameter, manufacturers can shift the MPPS to smaller particles, enabling ULPA performance (≥99.999 % at 0.12 µm) without a disproportionate increase in pressure drop.
The cartridge frame must retain pleat geometry under differential pressure while providing a sealing surface for the gasket. ABS frames are common for general‑purpose HVAC because they are lightweight, corrosion‑free, and cost‑effective. In environments with higher mechanical loads or exposure to UV, polypropylene or aluminum frames provide greater stiffness and temperature tolerance. Stainless steel frames are selected for clean‑room or pharmaceutical applications where outgassing and particulate shedding must be minimized.
Gasket material influences both seal integrity and service life. EPDM foam gaskets compress uniformly to fill microscopic gaps between the cartridge housing and the filter flange, delivering a leak rate below 0.01 % of nominal flow. Silicone gaskets retain elasticity over a broader temperature range (‑40 °C to 200 °C) and resist degradation from ozone or silicone‑based lubricants. Neoprene offers a middle ground with good oil resistance, while polyurethane foam provides high rebound strength for frequent‑changeout systems.
Round HEPA cartridges are preferred in installations where radial flow distribution reduces velocity gradients across the filter face. In turbine inlet filtration, the cylindrical geometry matches the circular ductwork, eliminating transition losses that would otherwise increase fan power consumption. The pleated configuration provides a large effective surface area within a compact envelope, allowing high airflow rates (up to 2 m³/s per cartridge) while fitting within restrictive nacelle spaces.
In semiconductor wafer processing, the cartridges serve as terminal filters for recirculating air in lithography bays. The absence of metal components in the media path prevents particle generation from corrosion, and the option for stainless‑steel frames eliminates outgassing sources. The ability to customize gasket chemistry ensures compatibility with the specific solvent vapors used in photoresist processes, maintaining filter integrity over extended run times.
Customization begins with the process conditions: required airflow, permissible pressure drop, temperature extremes, and chemical exposure. From these inputs, engineers select media type and pleat density to meet the target efficiency while staying within the pressure‑drop budget. Frame material is then chosen based on mechanical strength needs and environmental compatibility, followed by gasket selection that aligns with temperature cycling and sealing requirements.
Dimensional adjustments are limited by manufacturing tooling; however, diameter and height can be altered in 25 mm increments using adjustable mandrels and pleat‑forming dies. Pleat count is adjusted by changing the pleat height and the number of folds per revolution, which directly impacts media surface area. All customizations are documented in a configuration sheet that links each parameter to a verified test report, ensuring traceability for qualification audits.
Quality assurance starts with incoming media inspection, where fiber diameter distribution and basis weight are verified against supplier certificates using laser diffraction and gravimetric analysis. During pleating, each cartridge undergoes a visual scan for pleat deformation or media tears; any deviation beyond 0.5 mm triggers automatic rejection. Frame dimensions are checked with coordinate‑measuring machines to ensure concentricity within 0.2 mm.
Finished cartridges are subjected to a batchwise integrity test: a particle challenge aerosol (0.02 µm–10 µm) is fed upstream, and downstream particle counts are measured with a laser particle counter. The resulting efficiency curve must meet or exceed the specified MPPS rating. Pressure drop is recorded at the design flow rate; cartridges exceeding the allowable drop by more than 10 % are investigated for pleat blockage or media compaction. All test data are retained for a minimum of five years to support regulatory audits.
Cartridges are packed in single‑wall corrugated cartons with internal polyethylene foam inserts that prevent radial movement. Each carton includes a desiccant packet to control humidity during transit, which is critical for media that can absorb moisture and experience a temporary efficiency dip. For overseas shipments, cartons are placed on ISPM‑15 compliant pallets and stretch‑wrapped with UV‑stable film to protect against precipitation and pallet shifting.
Labeling follows the client‑specified format, containing part number, configuration code, batch identifier, and a QR code linking to the digital test report. Handling instructions indicate the correct orientation (flow arrow) and warn against excessive bending, which could permanently deform pleats. Upon receipt, customers are advised to perform a visual inspection and a quick pressure‑drop check before installation to confirm that no shipping damage has occurred.
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