High-temperature non-partitioned HEPA filters are specialized air purification technologies designed for high-temperature environments. Their core feature is the ability to operate continuously and stably in high-temperature conditions (typically ranging from 250°C to 400°C or even higher) while maintaining high-efficiency filtration (usually ≥99.97% H13 grade or higher) of particles 0.3 micrometers and larger. Compared to traditional "partitioned" filters, the "non-partitioned" design uses glass fiber strips instead of aluminum partitions, offering a more compact structure, lighter weight, and relatively higher dust capacity.
The following are the main application scenarios and industries for this technology, which typically have special requirements for the cleanliness, temperature, or processes of the production environment:
I. Pharmaceuticals and Biotechnology Industry
This is one of the most classic and stringent application areas.
1.1 Dry Heat Sterilization Cabinets (Tunnel Ovens)
Used for sterilizing and removing pyrogens from ampoules, vials, and other pharmaceutical containers. The internal temperature of these devices often exceeds 300°C. HEPA filters are installed at the cooling section outlet to ensure that the containers entering the Class 100 laminar flow protection are not contaminated by particles and bacteria in the ambient air. This is the most core and common application scenario.
1.2 Sterile Manufacturing Processes (API)
In the production and packaging of high-temperature sterile APIs, a high-temperature clean environment is required. High-temperature HEPA filters are used to ensure this environment.
1.3 Process Ovens
Used for high-temperature sterilization and drying of equipment components and tools, ensuring the air cleanliness during the drying process.
II. Food and Beverage Industry
2.1 High-Temperature Sterilization Processes
Such as UHT (Ultra-High Temperature) production lines and the sterile compartments of filling machines. In these areas, hot air needs to be HEPA-filtered to ensure that products are filled in a sterile state and to prevent secondary contamination.
2.2 Drying Equipment
For the drying production lines of powdered or granular foods such as milk powder, tea, and spices, high-temperature clean hot air is required to avoid product contamination and ensure quality.
III. Chemical and New Materials Industry
3.1 Lithium-Ion Battery Manufacturing
- Electrode Drying Furnaces: During the drying process of electrodes after coating, the temperature inside the drying oven is very high. High-temperature HEPA filters can provide clean hot air to the electrodes, preventing metal dust and other particles from adhering to the electrodes, which is a critical step affecting battery safety and performance.
3.2 Semiconductor and Electronics Industry
- Although most cleanrooms operate at room temperature, in some special process steps, such as the intake systems of high-temperature oxidation furnaces and diffusion furnaces, high-temperature HEPA filters are required to provide ultra-clean hot air.
3.3 Fine Chemicals
Certain chemical reactions or material synthesis processes that require a high-temperature clean environment.
IV. Hospitals and Medical Facilities
4.1 Central Sterile Supply Department (CSSD)
In large hospitals, high-temperature HEPA filters are sometimes installed at the exhaust ports of large sterilizers in the CSSD to prevent the contamination of the external environment by biological aerosols that may be generated during the sterilization process, especially when handling high-risk contaminants.
V. Laboratories and Research Institutions
5.1 Biosafety Laboratories (BSL-3/BSL-4)
The exhaust systems of these laboratories must be HEPA-filtered. If the experimental process involves high-temperature equipment or the exhaust may be at a high temperature, high-temperature HEPA filters are required to ensure absolute safety.
5.2 Animal Facilities
High-temperature cage washing and sterilization passages.
#### 5.3 Material R&D Laboratories
Ventilation systems for various high-temperature experimental furnaces and reactors.
VI. Industrial Coating and Surface Treatment
6.1 Spray Drying Rooms/Furnaces
In the coating lines of the automotive and home appliance industries, after the workpieces are sprayed, they need to enter high-temperature drying rooms for curing. High-temperature HEPA filters are used to provide clean hot air to the drying rooms, preventing dust particles from settling on the uncured paint surface and causing defects.
VII. Core Value Summary of High-Temperature Non-Partitioned HEPA Filter Technology
7.1 Ensuring Product Quality
Eliminating particle contamination in high-temperature processes is key to producing high-reliability products, such as sterile pharmaceuticals, high-performance batteries, and high-end chips.
#### 7.2 Meeting Regulatory Requirements
Under strict regulations such as GMP (Good Manufacturing Practice) and FDA (Food and Drug Administration), these filters are mandatory.
7.3 Ensuring Process Safety
In the chemical and biosafety fields, preventing the release of hazardous substances, protecting the environment, and ensuring personnel safety.
7.4 Improving Product Yield
In the electronics and coating industries, significantly reducing the scrap rate caused by dust.
In summary, high-temperature non-partitioned HEPA filters are the bridge connecting "high-temperature processes" with "ultra-high cleanliness requirements" and are indispensable key components in modern high-end manufacturing and life sciences fields.