faq

I. Core Performance Advantages of HEPA Filters
The definition of a HEPA filter is "the filtration efficiency of particles with a diameter of 0.3 micrometers is ≥ 99.97%" (American standard). Its unique structure (such as the random stacking of ultra-fine glass fibers or polypropylene melt-blown materials) can capture tiny particles through multiple mechanisms such as interception, inertial collision, and diffusion.
II. Functional Requirements of Clean Rooms Depend on HEPA Filters
Clean rooms are widely used in the pharmaceutical, electronic, semiconductor, biological laboratory, and precision manufacturing industries. These scenarios have extremely strict requirements for air cleanliness (such as a Class 1 clean room requiring no more than 10 particles of ≥ 0.5 micrometers per cubic meter of air). The role of HEPA filters is reflected in:
Ensuring product quality and performance
Electronic/semiconductor industry: During chip and wafer production, even a 1-micron particle adhering to the surface can cause circuit shorting and yield drops. HEPA filters can control the particle concentration in the production environment to below millions or even billions, ensuring the stability of precision components.
Pharmaceutical industry: If there are microorganisms or dust in the production environment of injectables or sterile medical devices, it may cause drug contamination and patient infection. HEPA filters are the core equipment required by GMP (Good Manufacturing Practice) and directly relate to the safety of drugs.
Maintaining the stability of the experimental / production environment
Biological laboratory: When studying viruses, bacteria, or genetic engineering, HEPA filters can prevent harmful microorganisms from leaking (protecting operators), and at the same time prevent external bacteria from entering (avoiding sample contamination).
Precision optics industry: If there is dust in the processing / assembly environment of lenses and laser components, it will affect optical performance (such as light transmittance, imaging accuracy), and HEPA filters can ensure that the environmental cleanliness meets the optical grade standard.
III. Irreplaceability of HEPA Filters in Clean Room Systems
The air purification system of a clean room is usually composed of "primary efficiency → medium efficiency → high efficiency (HEPA)" three levels of filtration. Among them, the HEPA filter is the last and most crucial barrier:
Primary and medium efficiency filters can only remove large particles (≥ 10 micrometers) and cannot handle PM2.5-level tiny particles;
HEPA filters can directly filter particles with a diameter of ≥ 0.3 micrometers and have stable efficiency (the lifetime filtration efficiency decay is slow), and can maintain the designed cleanliness of the clean room for a long time.

High-temperature resistant air filters are specialized filtration equipment designed to filter particulate matter and impurities in the air under high-temperature conditions. Their core feature is the ability to maintain stable filtration performance and structural integrity at relatively high temperatures (typically ≥ 80°C, and some models can withstand temperatures above 200°C or even higher). They have a wide range of applications, mainly in scenarios where high-temperature operations are required and strict air quality standards are imposed. The specific applications are as follows:
1. Industrial production sector
High-temperature drying / baking processes
Food processing: such as drying lines for biscuits, instant noodles, and meat, which need to filter dust in the hot air to prevent product contamination.
Painting industry: high-temperature curing ovens (such as the drying stage of automotive painting lines), filtering the air entering the oven to prevent dust from adhering to the coating surface and causing defects.
Material processing: high-temperature shaping or drying processes for plastics, rubber, and composite materials, to avoid impurities in the air affecting material properties.
II. Energy and Chemical Production
Boilers and Generator Sets: Filter the high-temperature combustion air entering the boiler to reduce the wear on the furnace and heat exchangers caused by dust, and improve combustion efficiency.
Chemical Reaction Vessels: Some high-temperature chemical reactions require the introduction of clean air. High-temperature resistant filters can prevent impurities from interfering with the reaction process or contaminating the products.
III. Medical and Laboratory Fields
High-temperature Sterilization Environment: For example, hospital high-temperature steam sterilizers and laboratory dry heat sterilization ovens. During the cooling stage of the equipment, the air introduced needs to be filtered through high-temperature resistant filters to prevent external microorganisms or dust from entering the sterilized items (such as medical devices, laboratory equipment).
Biological Safety Laboratories: Some experimental sections involving high-temperature inactivation require high-temperature resistant filters to treat the contaminated high-temperature air, to prevent the spread of harmful microorganisms.

I. Air Purifier Filters
Primary Filter (for hair and large particles): Clean every 1-3 months, replace every 6-12 months.
Activated Carbon Filter (for odor and formaldehyde removal): Replace every 3-6 months (if formaldehyde concentration is high, shorten to 2-3 months).
HEPA Filter (for PM2.5 and bacteria): Replace every 6-12 months (in high-pollution areas, recommend 3-6 months).
Composite Filter: Replace according to the shortest filter cycle among them.
II. Commercial/Industrial Air Filters
Primary Filter (G1-G4): Usually replace every 1-3 months, used for pre-treatment of large particles.
Intermediate Filter (F5-F9): Replace every 3-6 months, protecting the rear-end high-efficiency filter.
High-Efficiency Filter (H10-U17, such as HEPA, ULPA):
General workshops: Replace every 6-12 months.
Cleanrooms (such as pharmaceutical and electronic workshops): Replace every 3-6 months, and regularly test air volume and resistance. If the resistance exceeds the initial value by 1.5 times, it must be replaced.
Special scenarios (such as hospital operating rooms): According to industry standards, high-efficiency filters must be forcibly replaced every 6-12 months, and professional testing is required.