Filter bag is the necessary component for bag filter housing. There are various filter bags with different material and precision. How to choose the right one?
Step 1. Choose suitable material
Material
Temperature(℃)
Water
Aliphatic series
Aromatic series
Weak base
Weak acid
Alkali
strong acid
PP
90
●
●
●
●
●
●
PE
160
●
●
●
●
●
●
Nylon
160
●
●
●
●
●
* approximate value ●applicable
According to the actual requirements of the filtration process, to determine the filtration mode (deep filtration, surface filtration) first, and then choose the filter bag material.
Step 2. Check the technical specifications
Size
Max flowrate(m3/h)
Filter area
(m2)
Volume
(L)
Dia.
(mm)
Length
(mm)
Processing mode
Material
1-3μm
5-200μm
#01
8
16
0.25
8.0
180
440
Steel wire seam
/Plastic hot melting
PE/PP/MO
#02
20
32
0.50
17.0
180
810
Steel wire seam
/Plastic hot melting
PE/PP/MO
#03
3
6
0.09
1.3
102
210
Steel wire seam
PE/PP/MO
#04
6
12
0.16
2.5
102
380
Steel wire seam
PE/PP/MO
According to the filter flow rate, medium viscosity, filter precision, to determine the size of the filter bag.
Step 3. Consider the chemical compatibility
MOC
Solvent
Strong acid
Weak acid
Strong base
Weak base
Surface affinity
Temp. tolerance (℃)
NC
3
5
5
1
1
Oleophilic, hydrophilic
150
PP
4
1
1
1
1
Slightly oleophilic, lyophobic
93
PE
3
3
2
5
3
Oleophobic, hydrophile
150
NY
3
5
4
1
1
Slightly oleophilic, lyophobic
150
PT
2
1
1
1
1
Oleophobic, lyophobic
260
In general, for filtrates with a higher polarity such as acid-alkali and salt, polypropylene (PP) will do. For filtrates with lower filtrate such as solvent, polyester (PE) or Nylon (NY) will be the right choice.
