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PVDF characteristics, benefits, comparisons with other materials Membrane filter types and characteristics |
Material | Abbr. | Advantages | Disadvantages | | Polypropylene | PP | - Low cost
- High pH range tolerance
| - No chlorine tolerance
- Expensive cleaning chemicals required
| | Polyvinylidene fluoride | PVDF | - High chlorine tolerance
- Simple cleaning chemicals
| | | Polyether sulfone & polysulfone | PES/PS | - Chlorine tolerance
- Reasonable cost
| - Brittle material requires support or flow inside to outside
| | Polyacrylonitrile | PAN | - Low cost
- Typically used for UF membranes
| - Less chemically resistant than PVDF
| | Cellulose acetate | CA | | - Narrow pH range
- Biologically active
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PP or PE Membrane | PVDF Membrane | Prone to membrane fouling | Anti-fouling properties | | Low flux 6cu m / day / m2 | Higher flux 15 to 20 cu m / day / m2 | Degrades easily when in contact with commonly used chemical for membrane cleaning e.g. chlorine, sodium hypochlorite, H2O2
| Oxidant resistane e.g. membrane cleaning agents, chlorine, sodium hypochlorite, H2O2
| | Short membrane life span (2-5 years) | Longer membrane life span (> 5 years) | | Strength limited compared with PVDF | Good mechanical and physical strength | | Compared to PVDF materials are more readily degraded in presence of high temperature, radiation and chemicals | Can withstand high temperatures. Resistant to many corrosive chemicals. Radiation resistance properties |
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