ULPA (Ultra Low Penetration Air Filter), also known as an ultra-efficient air filter or ultra-low penetration air filter, achieves a filtration efficiency of over 99.999% for dust particles such as 0.1~0.2μm-sized particles, smoke, and microorganisms [1]. According to standards like GB/T 13554-2020 or EN1822, its filtration efficiency for 0.1~0.2μm particles under rated airflow is no less than 99.999% [2] [8]. It is widely used in fields such as semiconductor manufacturing, biopharmaceuticals, precision instruments, and sterile food filling [1] [8] [10-11].
Ultra-Low Penetration Air (ULPA) filters typically consist of components such as filter elements and housing, with the filter element being the core part [1]. According to the EN1822 standard, ULPA filters are classified into grades like U15, U16, U17, etc., with filtration efficiencies ranging from 99.9995% to 99.999995% [10] [13]. Their Most Penetrating Particle Size (MPPS) range generally falls between 0.1~0.2μm [2] [10]. Compared to High-Efficiency Particulate Air (HEPA) filters, ULPA filters offer higher filtration efficiency, stronger blocking capacity, and longer service life, but they also incur higher costs and greater airflow resistance
Details:
Filtering objects: ultrafine particles ≥ 0.12μm (nano-sized dust, viruses, radioactive particles)
Efficiency class: U15-U17 (EN 1822)
Efficiency ≥ 99.9995% (MPPS, Most Penetrating Particle Size)
Structural design: ultra-thin design without baffles, with denser pleats
Frame material: High-quality anodized aluminum alloy, 304/316 stainless steel
Filter material: Borosilicate ultrafine glass fiber (extremely high density, extremely small pores)
Core Features
World-class top-tier purification precision
Extremely low leakage rate, 100% laser particle counting scanning inspection per unit
The resistance is higher than HEPA, requiring a dedicated high-static-pressure fan system
The price is high, and the installation environment and sealing requirements are stringent
Application
Semiconductor / Wafer Manufacturing (Class 1-5 Cleanroom);
Biopharmaceuticals, Genetic Engineering, Sterile Filling (Grade A Area);
Aerospace, precision optics, and nuclear industry;
Biological Safety Laboratory (BSL-3/4), High-Efficiency Particulate Air Filtration System.
Air Filter Product Parameters
| Parameter | Primary Filter | Medium Efficiency Bag Filter | HEPA Filter | ULPA Filter |
| Filtration Accuracy | ≥5μm large particles | 1–5μm medium particles | ≥0.3μm fine particles | ≥0.12μm nano-scale particles |
| Efficiency Grade | G1–G4 | F5–F9 | H13–H14 | U15–U17 |
| Typical Efficiency | 20%–90% (gravimetric method) | 45%–97% (counting method) | 99.97%–99.995% | ≥99.9995% |
| Filter Media | Non-woven fabric, metal mesh | Non-woven fabric, fiberglass | Ultra-fine glass fiber | Borosilicate glass fiber |
| Initial Resistance | ≤50Pa | ≤150Pa | 200–250Pa | 250–350Pa |
| Service Life | 1–3 months | 6–12 months | 1–3 years | 2–5 years |
| Main Function | Pre-filtration, rear-end protection | Intermediate filtration, dust removal | Terminal fine filtration, bacteria removal | Ultra-clean filtration, nano-particle removal |
