How to differentiate low-end air filer and high quality air filters

- Apr 13, 2018 -

How to differentiate low-end air filter and high quality air filters!First need to make full understanding of process technology:

Such as galvanized steel frame HEPA filter,Prized Hepa filter's frame work 1.0mm thickness no riffled galvanized plate; The sealant glue made of environmentally friendly polyamine ester sealant with no odor and will not turn yellow for more than three years. Use super fine water proof HEPA filter, The low end of the outer frame adopts 0.6 mm galvanized riffled plate this is not environmental friendly can't resistahunidity. And the sealant glue is made of acidic castor oil, This synthetic glue will tune yellow very soon, The filter paper is made of non-water proof filter paper this is a fatal error,becauser the useful life period will get short. Even worse is the mini pleat filter or deep pleat air filter the pleat heights and fold times all jerry-build bead results is the air volume is very small.

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Most of the factories have sealed strip (gasket) made of EVA. EVA slowly releases traces of toxic gases while sealing, causing secondary pollution to the environment,for high demand the clean environment such as pharmacy, oprating room is more deadly.How to solve this problem!New polyurethane foam seamless sealing technology, which can ensure HEPA-filter installation of zero leakage, so as to ensure the cleanliness of dust-free workhop, and zero release of harmful gases,environmental science and technology materials, will not cause secondary pollution of the environment.

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Priority among priorities is the test methods and test technology! Before come out of air filter work shop, test it each by each before out of workshop.

HEPA/ULPA air filter testing:

Testing is performed in Class 100(M3.5) clean zones within a Class 10,000(M5.5)clean room. All testing is conducted by the controlled and documented procedures of ISO 9008-2000 certified quality system. To enhancer upstream sampling capability,Leak-scanning systems are equipped with dilution equipment for measuring high particle concentrations. Probe geometry has been optimezed to maximize traverse rate and eliminate undetected leaks while maintainingh isokinetic sampling. The entire face of the filter is scanned with over lapping strokes including the media to frame interface. As per customer requirements, Polystyrene Latex Spheres(PSL)and Emery 3004 are standard challenge aerosols.

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Smoke test 

As in scanning test, leaks are located with the aid of heterogeneous, highly concentrated oil mist. Thefilter is placed horizontally and the oil mist is allowed to filter gently through the filter. With a dark backgroud and suitabler lighting leakage can be fonfirmed purely visually. Wisps of smoke passing the filter through holes in the filter are clearly visible. 

Scanning Electron Microscope

This unique tool allows to study and identify contaminants as small as 50nm(=0.00005mm), found in used filters and air samples. The microscope is used as a problem solving and quality control capability for our customers, and also to study and evaluate new filter media.

Inspection label

 After gaining approval, feach filter receives and inspection lavel stting its serial number,efficiency for MPPS particles as well as pressure drop at the test flow rate.

Another important is build up own database of how filters work and perform in real life.Standards have so far been concentrating on finding fast,economical methods to classify filters

On-site testing

 For On-site measurements including particle counters, pressure gauges, air flow meters, energy data loggers, corrosion monitors and gas analysis equipment.Combined with the expertise can help trouble shoot and improve ventilation system