Both polyvinylidene fluoride (PVDF) and polytetrafluoroethylene (PTFE) membranes are fluorine-containing materials. These microfiltration membranes have excellent chemical stability and are suitable for use at high temperatures.
PTFE stands for Poly Tetra Fluoroethylene. People generally call it non-sticking lining or easy-cleaning material. The material of PTFE has the characteristics of antiacid and antisolvent, which means it is hardly insoluble in all solvents. And PTFE is heat-resistant and with low friction coefficients. People always not only use it for lubricating but also regard it as the ideal coating material for the lining of water pipes.
PTFE membrane filter is a kind of material named ultra-fine fiber glass coated with PTFE resins. Its durability, fireproofing and antifouling property are all outstanding. The PTFE membranes are usually white, have high transmittance, and the ability to maintain their performance for more than 25 years.
Different from PTFE, PVDF is the abbreviation for Polyvinylidene Fluoride. PVDF membrane filter is from PVC membrane that is coated with PVDF resins on it, which is better than PVC membrane in durability. PVDF membrane is a kind of solid-phase carriers for the western blot in common use. It is hydrophobic.
Let us understand the difference between PVDF and PTFE in the following three aspects.
PVDF vs PTFE
1. Solvent resistance, acid, and alkali resistance are different for PVDF vs PTFE.
PTFE membrane, its use temperature is -40~260℃, can withstand strong acid, strong alkali, and various organic solvents. Because of its hydrophobicity, it can be used to filter the vapor and various corrosive liquids. But the PVDF membrane has the characteristics of fluororesin and general-purpose resin.
In addition to good chemical resistance, high-temperature resistance, oxidation resistance, weather resistance, and radiation resistance, it also has special properties such as piezoelectricity, dielectric, and pyroelectricity. Hawach also supplies hydrophilic PTFE membrane filter, which has the highest tolerance, best used for an aqueous organic mixed solution.
2. Different uses for PVDF vs PTFE.
The difference between PVDF and PTFE membranes in industrial applications, PTFE membrane is basically not used, but CMC + SBR is used for water, and PVDF membrane is used for oil.
3. The chemical reaction is different between PVDF and PTFE.
PVDF membrane is used in the low-potential test area of the negative electrode material. PTFE membrane can only be used at a higher potential. PTFE membrane is easy to decompose at low potential.
The smaller the aperture of the PVDF membrane is, the firmer the PVDF membrane is. There is an interesting phenomenon that PVDF membranes are popular than PTFE membrane filters in the northern territory. Maybe the reason is that the glass transition temperature of PVDF membranes is close to 40 degrees below zero, it is better in low-temperature resistance.