Instruction for use

PuraMem® Membrane Flat Sheet

4.

5.

GENERAL NOTES:OSN membrane sheets are asymmetric polymeric
membranes, and have a shiny yellow side (the activemembrane surface) and a matte side (the supportlayer). The membrane should always be installed in
the filtration equipment with the active membranesurface facing the process solution. Flat sheet
membranes are generally provided as DIN A4 sized(210x297mm) sheets. The sheets generally lie flat,
however some samples will have a tendency to curl –this is normal and special care should be taken whencutting disks from curly sheets. It is also normal forthe membrane color to darken over time – colourchange does not affect membrane performance. The
membrane sheets should always be handled withcare and not be folded.

INSTRUCTIONS FOR USE:
1.
2.
3.

The shiny yellow side is the active surface ofthe membrane. Care should be taken to
avoid scratching this surface where possible.
Cut the membrane to the correct size for thefiltration test cell and insert in the filtration
cell.
PuraMem® membranes contain apolyethylene glycol preservative that is easily
washed out prior to use with a solvent suchas toluene, ethanol, or THF. Permeate atleast 50 L per m2 (255mL for a 90mm
diameter disk (51 cm2)) of solvent throughthe membrane t operating filtration pressure
to flush the preservative from a newmembrane disk, and discard the resulting
permeate.

Evonik Resource Efficiency GmbH | PuraMem® | March 2017 1/2

6.
7.

NOTE: Do not exceed the maximum working
pressure of the membrane when flushing thepreservative from the membrane – pleaserefer to the table on page 1 for themaximum operating pressure of each
PuraMem® membrane type.
Once wetted, the membrane should remain
wet and not be allowed to dry out. Using
membranes that have dried-out will result inpoor membrane performance and rapid
failure.
Once wetted, the membrane should not be
re-used after it has been removed from thefiltration cell, even if it has been kept wet. As
the sealing process in the filtration cellcompresses the membrane at the seal point,
any misalignment when the membrane is reused will lead to leaks and by-passing of themembrane – this is undesirable as data
generated with a misaligned membrane will
not be representative of the membrane type.
Stable membrane performance is achieved
after 2 to 4 hours of filtration
Please store in dry condition and away fromlight.

If the goods supplied hereby by Evonik Resource
Efficiency GmbH are used in any work which ispublished, or submitted for publication, in anyforum, including, but not limited to, conferences,seminars, internet publications, academic journals,
magazines, newspapers, and any other public media
not explicitly described above, the authors of thiswork undertake to include reference to Evonik
Resource Efficiency GmbH as the supplier of theseproducts, and to include in the publication theEvonik Resource Efficiency GmbH OSN membrane
website (www.puramem.com) and other company
details as appropriate.

SPECIFICATIONSPURAMEM® 280, PURAMEM® S600
General Membrane Material: Polyimide
 Flat Sheet: 210 x 297 mm

SOLVENT STABILITY PuraMem® membranes are stable in mild and nonpolar solvents2:- e.g. Alcohols (e.g. Methanol,Ethanol, 2-Propanol)- Aliphatic hydrocarbons (e.g.
Hexane, Heptane)- Aromatic hydrocarbons (e.g.
Toluene, Xylene)- Butyl Acetate, Ethyl Acetate- Methyl-Ethyl-Ketone- Methyl-tert-Butyl-Ether,
PuraMem® membranes are not recommended for use
in aqueous/water mixtures. For aqueous/organic
solvent mixtures, please contact us for membrane
recommendations.

USE CONDITIONSMembrane CodePuraMem®

PuraMem® S

MWCO (g.mol-1)3,4280

600

Minimum Flux (L.m-2.h-1)31830

Typical Operating
Pressure (barg)

20-40

Maximum Pressure (barg)

60

Maximum Temperature (ºC)

50

Allowable pH

71 Membrane area is a nominal value and depends on the spacer dimensions

used in the module.
2 Data referring to membrane sheets with pure solvents. If you intend to use asolvent not listed above please contact us for further advice.
3 Performance Data are approximate and based on flat-sheet membrane. Test
conditions: toluene at 30 barg and 30ºC.
4 Based on rejection of styrene oligomers dissolved in toluene. MWCO =molecular weight cut-off which is defined as the molecular weight at which 90%
rejection is obtained from a curve of rejection versus molecular weight ofstyrene oligomers dissolved in toluene.

Evonik Resource Efficiency GmbH | PuraMem® | March 2017 2/2Disclaimer
This information and all technical and other advice are based on
Evonik’s present knowledge and experience. However, Evonikassumes no liability for such information or advice, including theextent to which such information or advice may relate to third party
intellectual property rights. Evonik reserves the right to make anychanges to information or advice at any time, without prior orsubsequent notice. Evonik disclaims all representations andwarranties, whether express or implied, and shall have no liability
for, merchantability of the product or its fitness for a particularpurpose (even if Evonik is aware of such purpose), or otherwise.
Evonik shall not be responsible for consequential, indirect orincidental damages (including loss of profits) of any kind. It is thecustomer’s sole responsibility to arrange for inspection and testingof all products by qualified experts. Reference to trade names usedby other companies is neither a recommendation, nor anendorsement of the corresponding product, and does not imply
that similar products could not be used.

Evonik Resource Efficiency GmbHHigh Performance Polymers
Paul-Baumann-Straße 145772 Marl
Germany
Phone +49 02365 49-4800
emet@evonik.com
www.puramem.com