MS Hydrophobic PVDF Membrane

Membrane Solutions' polyvinylidene fluoride (PVDF) hydrophobic membrane is produced through a proven manufacturing process and features superhydrophobic performance. It has high mechanical strength and wide chemical compatibility, and can be used in solvent filtration, air and gas filtration, sterilizing filtration, as well as sample preparation in HPLC and GC. In the highly competitive national market, Membrane Solutions' PVDF membrane has unique advantages and provides customers with a better experience.
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Hydrophobic PVDF Membrane

 

Features

The hydrophobic PVDF membrane has many excellent properties, especially its superhydrophobicity and wide chemical compatibility.

  • Superhydrophobic, low adsorption
  • Excellent oxidation resistance, widely applicable
  • Usable for liquid filtration after soaking in 30% ethanol
  • Excellent heat resistance: can operate continuously at high temperatures (90°C)
  • Filtration area ≥ 0.7 square meters (10")
  • Particle retention rate > 99.99%
  • Low extractables
  • Good antioxidant properties
  • Sterilization method: high-temperature steam sterilization, gamma sterilization

Applications

  • Sterilization Filtration
  • Air and Gas Purification
  • Sample Preparation
  • Solvent Filtration

Technical Parameters

Membrane Material

PVDF

Wetting Performance

hydrophobic

Support

None

Structure

Symmetry

Thickness

110-130um

Width

260mm-300mm

Length

100-200m

Sterilization

High-temperature steam sterilization, Gamma

Pore Size

0.1/0.22/0.45/0.8/1.0/3.0/5.0μm

Membrane Testing Reports Available

Bubble Point and Flow Test Report
Pore Size Analysis Report
SEM
FTIR

Contact Angle Test
Bacterial Retention Test Report
HPLC Test Report

Tensile Strength Test Report

FAQ

1. Basic Characteristics and Selection

Q1: What is the difference between hydrophobic and hydrophilic PVDF membranes, and what are their core uses?

A: Hydrophobic PVDF: not wetted by water, high water entry pressure-dedicated to gas/steam filtration, organic solvents, vents/respirators. Hydrophilic PVDF: used for aqueous solutions.

Q2: Common pore sizes and applications of hydrophobic PVDF membranes?

A: 0.05–5.0μm:

  • 0.22μm: Gas sterilization, sterile respirators
  • 0.45μm: Solvent clarification, gas particle removal
  • ≥1.0μm: High-flow gas/steam, fermenter respirators

Q3: Temperature resistance and sterilization of hydrophobic PVDF?

A: Continuous ≤ 90°C, short-time steam sterilization at 121°C; resistant to gamma and EO sterilization; not resistant to high-temperature drying.

Q4: Chemical compatibility of hydrophobic PVDF membranes?

A: Resistant to most organic solvents, acids/bases, oxidants. Not compatible with DMSO, DMF, DMAc, NMP, concentrated strong bases (>10% NaOH), or high-temperature polar solvents.

2. Applications and Operation

Q5: What are the main applications of hydrophobic PVDF membranes?

A: ① Gas/sterile air filtration (fermentation, pharmaceutical, electronics). ② Organic solvent filtration (HPLC samples, chemical reagents). ③ Tank top respirators (contamination prevention, pressure maintenance). ④ Steam filtration, high-temperature liquids.

Q6: What happens when hydrophobic PVDF is used to filter aqueous solutions? How to wet it?

A: Water cannot spontaneously enter the pores; it will hardly pass. Pre-wet with a low-surface-tension solvent (ethanol/IPA) and then exchange with water. Once wetted, it is no longer hydrophobic and cannot be used for gas filtration.

Q7: What to do if gas filtration flow rate is low or differential pressure is high?

A: ① Choose a larger pore size or larger area. ② Check for line blockages and correct filter orientation (gas inside→outside). ③ For hot gas, preheat housing to prevent stress cracking. ④ Regular back-blowing/cleaning.

Q8: Precautions when using hydrophobic PVDF for liquid filtration?

A: Only for organic solvents / non-aqueous liquids. Aqueous solutions must be pre-wetted. Do not apply excessive reverse differential pressure (≤0.2MPa). After filtration, dry thoroughly to restore hydrophobicity for gas use.

3. Maintenance and Troubleshooting

Q9: How to clean and regenerate hydrophobic PVDF membranes?

A: ① Gas fouling: back-blow with hot air/nitrogen (≤0.2MPa). ② Liquid/particle fouling: soak in ethanol/IPA + backflush. ③ Protein/colloid fouling: 0.1% NaOH + 0.5% NaClO, circulate at 40°C. ④ After cleaning, dry until fully hydrophobic.

Q10: How to judge failure and when to replace hydrophobic PVDF membranes?

A: ① Loss of hydrophobicity (water can pass). ② Differential pressure > 0.25MPa, flow rate drop. ③ Membrane cracking, powdering, deformation. ④ Integrity/retention fails. ⑤ Respirator frequently gets liquid or becomes contaminated.