Flat sheet membrane

Unfortunately, Koch has discontinued the ultrafiltration membrane HFM-100. The HFM-180 is a viable alternative to the 100 and 116, it is PVDF with a separation range of 100,000. The good news is we will be adding 4 new membranes in the next couple of weeks.

Compare the specifications for all of our UF membrane designations here.

Sterlitech is now carrying Dow FilmTec flat sheet membranes for reverse osmosis and nanofiltration separations. These high-performance membranes are available in Sepa CF, CF042, or HP4750 sizes, or as 12 x 12 inch sheets.

The FilmTec line of spiral wound membranes was created by the experts at Dow Water & Process Solutions for industrial, municipal and commercial water applications. While they have often been used for large industrial processes like power generation and semiconductor plants, with our precut sizes it is easier than ever to implement these membranes for laboratory scale testing with a membrane test cell. For information on how to best utilize each membrane type, consult our application tab for recommended uses on each designation.

We’re sorry to say that we have just been informed that one of our ultrafiltration (UF) range flat sheet membrane designations, SelRO MPF-U20-S, has been discontinued. This means that we will no longer be able to offer our catalog numbers YMMPFU20S1818, YMMPFU20S195, YMMPFU20S475, or YMMPFU20S425. The SelRO MPF-U20-S designation was made from a proprietary Koch Membrane Systems polymer and used for a variety of research and industrial applications.

While this particular designation will be missed, we still have several other UF designations for sale that can meet your separation needs. To determine which designation is best for you, check out the Sterlitech UF specifications table.

Also, we have a very limited stock of these items still available so get in touch with us immediately if you are interested in your last chance to secure this membrane!

On the surface (no pun intended) the DK and DL series of nanofiltration (NF) membranes appear identical. They’re both thin-film membranes from Osmonics, and they are used for the same applications, such as dye concentration and acid purification, so why the separate designations?

In actuality, the difference is that the DL series has a higher flow rate, while the DK series provides higher rejection. If you look at our NF specifications page, you can see that the DK series has a rejection size of 98% -MgSO4, compared to 96% for DL. Conversely, DL has a Typical Flux/PSI of 31/100 (GFD@PSI), whereas DK rates at 22/100.

So there you have it, a small distinction perhaps, but hopefully it helps you pick the best possible item for your needs!

If you've ever worked with a Polyamide flat sheet membrane, there's a good probability that you may have noticed some slight discoloration on the active layer side of the filter, as seen below:

And additionally, this may have caused some uneasy speculation; is it mold? contamination? time to purchase a new membrane?

The good folks at Toray Membranes were able to shed some light on this common concern... literally.

Brown discoloration can be due to small amounts of residual amine from the manufacturing process.  The amine, (one of the building block compounds used to create the polymer constituting  the polyamide membrane family),  can turn brown with exposure to sunlight.

This effect doesn't make for a pretty membrane,  but it does not affect the performance of the membrane in any way.

Note: if it is in fact mold that you're seeing, you can try irrigating the area with dechlorinated water with a laboratory wash bottle to see if it lifts off.  Any rubbing of the membrane surface should be kept to an absolute minimum, as there is the possibility to scratch or damage the integrity of the membrane layer. And again, while not pretty, the mold shouldn't affect the integrity of the membrane.

Starting this week you can power your process filtration units and membrane test cells with the full line of flat sheet membranes from TriSep Corporation! These membrane elements are designed to provide premium efficiency in water treatment applications.

What is especially great about this news is that now you can get these membranes in precut sizes to fit the CF042, Sepa CF, and HP4750 membrane test cell (individual sheets are available too)! Performing desalination and wastewater purification just got a lot easier…

See the full announcement here.