|
Whatman PTFE membranes are chemically stable and inert. They are
suitable for applications involving aggressive organic solvents, strong
acids and alkalis. PTFE membranes are particularly suitable for
preparing samples for HPLC analysis. The hydrophobic nature of the
membrane also has applications for air and gas sterilization. The
membrane is laminated onto a non-woven polypropylene support web for
improved strength and handling and can be used at temperatures up to
150ºC.
Chemically Stable and Inert
PTFE is the membrane of choice for use with the aggressive solvents,
liquids and gases that can attack other membranes. It is resistant to
most acids, alkalis and solvents.
Applications
One of the major applications for the PTFE (Type WTP) filter is the
clarification of corrosives, solvents and aggressive fluids. This
includes the important requirement in HPLC analysis for sample
filtration where any solid particles can cause permanent damage to the
column. The 0.5µm pore size is normally used. Air and gas sterilisation
make use of the hydrophobic characteristics of PTFE membranes and their
ability to stop aqueous aerosols. Usual pore sizes are 0.2µm and 0.5µm.
Sterile venting of vacuum manifolds, fermentation vessels and sterile
filtrate tanks and containers utilise PTFE 0.2µm membranes.
| Typical Data - PTFE |
| |
0.2 µm |
0.5 µm |
1.0 µm |
| Thickness |
130 µm |
120 µm |
90 µm |
| Porosity |
0.72 |
0.74 |
0.76 |
| Maximum Temperature |
150ºC |
150ºC |
150ºC |
| Ordering Information - PTFE
Membranes |
| Diameter (mm) |
Membrane |
Pore Size (µm) |
Catalogue Number |
Hydrophilic |
Protein Binding |
Solvent Resistance |
Quantity/Pack |
| 25 |
PTFE |
0.2 |
7582-002 |
No |
Low |
Very Good |
100 |
| 47 |
PTFE |
0.2 |
7582-004 |
No |
Low |
Very Good |
100 |
| 47 |
PTFE |
0.5 |
7585-004 |
No |
Low |
Very Good |
100 |
| 47 |
PTFE |
1 |
7590-004 |
No |
Low |
Very Good |
100 |
|
+32 (0) 16
58 90 45 
+32 (0) 16
50 90 45
