design principle：
The microfilter element with large specific surface area and filtering precision over 0.22um is mainly used to prevent impurities in air and harmful bacteria and microorganisms from entering tank,
production line and aseptic room, which causes changes in water quality, products and environment of aseptic room and meets the process requirements of food, biochemical,
beverage, beer, medicine and electronics industries.
The filter element materials include mixed cellulose ester, polypropylene, polyvinylidene fluoride, polyethersulfone, nylon, polytetrafluoroethylene, etc.
technical parameter：
Working pressure：0.6～0.8MPa；
? Inlet temperature：0～80℃；0～121℃（Steam）；
? Filtration accuracy：Above 0.22um belongs to microfiltration；
?Applicable media：Application in gas and liquid filtration；
Configuration Options (Quotes need to be selected on demand)：
? Pall/Donaldson Filter element + domestic filter housing
? full set Pall/Donaldson product
Product features：
1. Generally, the sterilization filter adopts the cross hanging type, which is in and out horizontally. Multi core filter can be designed as floor type.
2. Some use occasions are divided into pre filter and fine filter according to actual needs.
3. Air flow direction: from the outside to the inside through the filter element.
4. The compressed air entering the sterilization filter must pass through at least three stages of precision filter and dryer. For oil removal, water removal and dust removal, the oil mist concentration shall be ≤ 0.01ppm, otherwise the service life of the filter element will be affected and the expected sterilization effect will not be achieved.
5. Regular sterilization, according to the actual use situation, 1-2 times a week or a month, each time for 30 minutes, using clean saturated steam with 1 μ filtering accuracy for sterilization. Steam temperature < 140 ℃, steam pressure < 0.3MPa. Slowly open and close the valve.
6. When used as the respirator of tank and equipment, its function is mainly to connect the atmosphere to prevent the negative pressure inside the equipment and isolate the pollution source in the air. The function of filtration is not very good, so there is basically no requirement for filtration.
Integrity test：
In order to ensure the filtering effect of the sterilization filter, it is necessary to test the integrity of the filter before and after use to ensure its filtering effect. The main integrity testing methods include forward flow, bubble point and water intrusion.
The mainstream testers include flow star of Pall and intergritest of millipore
With the deepening of the implementation of GMP version 98 and the implementation of the new GMP certification inspection and evaluation standards, the integrity test of the filter has been paid more and more attention by the enterprises and the drug supervision and inspection officials,
almost every inspection must be carried out, especially the integrity test of the filter in the key process and key control steps has become the focus of every inspection.