Water Electret Meltblown meet ASTM Level 2 & Level 3 Standard

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Cobetter Water Electret Meltblown, compared with traditional electrostatic electret meltblown, has higher filtration efficiency and lower resistance, which can meet the ASTM American mask standard《ASTMF2100-2019》Level 2 and Level 3.

 

The core of PPE protective facial mask is meltblown. The traditional corona thermal electret electrostatic meltblown material is made of polypropylene, adding corona when it is heated, thus formed not a permanent electrostatic electret, with little electricity charged and uneven distribution. When producing into masks, it needs stacking more polypropylene filaments to reach the qualified filtration efficiency, thus the breathing resistance will be high. Therefore, for ASTM Level 2 & Level 3 barrier masks that require extremely high filtration efficiency and low respiratory resistance, it is difficult for traditional electrostatic electret meltblown to meet both requirements at the same time. If the filtration efficiency is high, the corresponding resistance will exceed standard. 

Hydro Charging Meltblown Manufacturing Processes

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Cobetter water electret meltblown, passing through a water electret equipment, firstly undergoes a cold water cooling, the pure water passes through a certain angle, pressure, and flow rate to spray the meltblown. The friction between the water and the meltblown cloth generates static electricity, which is transported through conductive material in the electret masterbatch and enters into tourmaline or zircon to achieve static retention. The advantage of water electret lies in its electrification process, which is carried out in a high humidity environment. The static electricity on the surface of the meltblown cloth is washed away by the water, leaving the static electricity only inside the meltblown.


The second process of water electret is a process of drying and electricity locking for meltblown. The drying process uses the flow of hot air, the surface temperature is increased and the surface air flow is increased to dry. This process is actually a working principle of a static elimination equipment. All of the electricity staying outside of the electret masterbatch, will be taken away. In this second process, a part of the electricity on the surface of the meltblown cloth is eliminated, that is, virtual electricity. Therefore, after the above two processes, the electret on the polypropylene can be guaranteed to be permanent.


Excellent Cobetter Water Electret Melblown

Compared with the traditional corona thermal electret electrostatic meltblown material, water electret meltblown is more saturated with static electricity, and its electrostatic retention is more than three times that of the electric electret, so the corresponding filtration efficiency is higher. Because the electric field is high, there are few materials to be stacked, thus the amount of polypropylene stacked is only half of the electric electret. The material required is thinner, and the breathing resistance is correspondingly lower. Cobetter water electret meltblown is perfect for ASTM Level 2 & Level 3 Surgical face mask usage.

Production Base  

Cobetter meltblown adopts Japanese original production line, guarantees that all production and packaging are completed in a 100,000-class clean room to ensure high cleanliness.

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Cobetter experiments have verified that, target for American standard《ASTMF2100-2019》 LEVEL 2, LEVEL 3 masks, Cobetter water electret meltblown can achieve the requirement of 98% filtration efficiency under the premise that the resistance is not exceeded.




Features and Advantages

  • ·  Saturated amount of static electricity

  • ·   High particle filtration efficiency

  • ·   Few Polypropylene stacking volume

  • ·   Low resistance



LEVEL2 & LEVEL3 Standard


BFE

Differential Pressure (pa)

PFE  (%)

   Level 2

98 %

50

   98

   Level 3

98 %

60

   98

Remarks:《ASTMF2100-2019》requires, the bacteria filtration efficiency of Level 2 and Level 3 masks achieve 98% or higher, differential pressures are less than 50pa and 60pa respectively, and filtration efficiency for 0.1μm latex particles is higher than 98%.

Water Electret Meltblown Test Report


Weight (g/m²)

Differential Pressure (pa)

PFE  (%)

   Melt-Blown

30

< 30

 > 98

Cobetter experiments have verified that, target for American standard《ASTMF2100-2019》 Level 2, Level 3 face masks, Cobetter water electret meltblown can achieve the requirement of 98% filtration efficiency under the premise that the resistance is not exceeded. 


Links:

Cobetter water electret meltblown-meet FFP2 & FFP3 standards

Cobetter PTFE mask membrane-meet EU mask standards《EN14683:2019+AC》TYPE ⅡR level


ASTMF2100-2019 Standard.pdf

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For technical data sheet or application inquiry, you are more than welcome to contact our sales representative by sales@cobetterfilter.com or leave a message