Reverse Osmosis (RO) Membranes

Sterlitech reverse osmosis (RO) flat sheet membranes may be used in our process filtration units for evaluation or for any of your general separations needs.

Sterlitech carries three brands of reverse osmosis (RO) membranes:

Veolia flat sheet membranes
TriSep flat sheet membranes
FilmTec™ flat sheet membranes

Please note: custom sample selections of our flat sheet membranes are also available upon request.

Detailed List Of Sterlitech Flat Sheet Membranes

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SKU	Product Name	Designation	Polymer	Size	Pack Size	Est Ship	Price
YMBW304060	Dow Filmtec Flat Sheet Membrane, BW30, PA-TFC, RO, 1016 x 1524mm, 1/Pk	BW30	Polyamide-TFC	1016 x 1524mm	1	2 weeks	$538.44	View Details
YMBW303001	Dow Filmtec Flat Sheet Membrane, BW30, PA-TFC, RO, 305 x 305mm, 1/Pk	BW30	Polyamide-TFC	305x305mm	1	5-7 days	$127.20	View Details
YMBW30475	Dow Filmtec Flat Sheet Membrane, BW30, PA-TFC, RO, 47mm, 5/Pk	BW30	Polyamide-TFC	47mm	5	5-7 days	$83.88	View Details
1121896	Dow Filmtec Flat Sheet Membrane, BW30, PA-TFC, RO, 90mm, 5/Pk	BW30	Polyamide-TFC	90 mm	5	5-7 days	$227.93	View Details
1120980	Dow Filmtec Flat Sheet Membrane, BW30, PA-TFC, RO, CF016, 5/Pk	BW30	Polyamide-TFC	CF016	5	5-7 days	$167.78	View Details
YMBW304205	Dow Filmtec Flat Sheet Membrane, BW30, PA-TFC, RO, CF042, 5/Pk	BW30	Polyamide-TFC	CF042	5	5-7 days	$167.78	View Details
YMBW301905	Dow Filmtec Flat Sheet Membrane, BW30, PA-TFC, RO, Sepa, 5/Pk	BW30	Polyamide-TFC	Sepa	5	5-7 days	$296.26	View Details
1122018	Dow Filmtec Flat Sheet Membrane, BW30XFRLE, PA-TFC, RO, 305 x 305mm, 1/Pk	BW30XFRLE	Polyamide-TFC	305x305mm	1	5-7 days	$127.20	View Details
1122019	Dow Filmtec Flat Sheet Membrane, BW30XFRLE, PA-TFC, RO, 47mm, 5/pk	BW30XFRLE	Polyamide-TFC	47mm	5	5-7 days	$83.88	View Details
1122020	Dow Filmtec Flat Sheet Membrane, BW30XFRLE, PA-TFC, RO, 90mm, 5/pk	BW30XFRLE	Polyamide-TFC	90 mm	5	5-7 days	$227.93	View Details
1122021	Dow Filmtec Flat Sheet Membrane, BW30XFRLE, PA-TFC, RO, CF016, 5/pk	BW30XFRLE	Polyamide-TFC	CF016	5	5-7 days	$167.78	View Details
1122022	Dow Filmtec Flat Sheet Membrane, BW30XFRLE, PA-TFC, RO, CF042, 5/pk	BW30XFRLE	Polyamide-TFC	CF042	5	5-7 days	$167.78	View Details
1122023	Dow Filmtec Flat Sheet Membrane, BW30XFRLE, PA-TFC, RO, Sepa, 5/pk	BW30XFRLE	Polyamide-TFC	Sepa	5	5-7 days	$296.26	View Details
1122187	Dow Filmtec Flat Sheet Membrane, CR100, PA-TFC, RO, 1016 x 1524mm, 1/Pk	CR100	Polyamide-TFC	1016 x 1524mm	1	2 weeks	$538.45	View Details
1122025	Dow Filmtec Flat Sheet Membrane, CR100, PA-TFC, RO, 305 x 305mm, 1/Pk	CR100	Polyamide-TFC	305x305mm	1	5-7 days	$127.20	View Details
1122026	Dow Filmtec Flat Sheet Membrane, CR100, PA-TFC, RO, 47mm, 5/pk	CR100	Polyamide-TFC	47mm	5	5-7 days	$83.88	View Details
1122027	Dow Filmtec Flat Sheet Membrane, CR100, PA-TFC, RO, 90mm, 5/pk	CR100	Polyamide-TFC	90 mm	5	5-7 days	$227.93	View Details
1122028	Dow Filmtec Flat Sheet Membrane, CR100, PA-TFC, RO, CF016, 5/pk	CR100	Polyamide-TFC	CF016	5	5-7 days	$167.78	View Details
1122029	Dow Filmtec Flat Sheet Membrane, CR100, PA-TFC, RO, CF042, 5/pk	CR100	Polyamide-TFC	CF042	5	5-7 days	$167.78	View Details
1122030	Dow Filmtec Flat Sheet Membrane, CR100, PA-TFC, RO, Sepa, 5/pk	CR100	Polyamide-TFC	Sepa	5	5-7 days	$296.26	View Details
1122053	Dow Filmtec Flat Sheet Membrane, SEAMAXX, PA-TFC, RO, 305 x 305mm, 1/Pk	SEAMAXX	Polyamide-TFC	305x305mm	1	5-7 days	$127.20	View Details
1122054	Dow Filmtec Flat Sheet Membrane, SEAMAXX, PA-TFC, RO, 47mm, 5/pk	SEAMAXX	Polyamide-TFC	47mm	5	5-7 days	$83.88	View Details
1122055	Dow Filmtec Flat Sheet Membrane, SEAMAXX, PA-TFC, RO, 90mm, 5/pk	SEAMAXX	Polyamide-TFC	90 mm	5	5-7 days	$227.93	View Details
1122056	Dow Filmtec Flat Sheet Membrane, SEAMAXX, PA-TFC, RO, CF016, 5/pk	SEAMAXX	Polyamide-TFC	CF016	5	5-7 days	$167.78	View Details
1122057	Dow Filmtec Flat Sheet Membrane, SEAMAXX, PA-TFC, RO, CF042, 5/pk	SEAMAXX	Polyamide-TFC	CF042	5	5-7 days	$167.78	View Details
1122058	Dow Filmtec Flat Sheet Membrane, SEAMAXX, PA-TFC, RO, Sepa, 5/pk	SEAMAXX	Polyamide-TFC	Sepa	5	5-7 days	$296.26	View Details
1122060	Dow Filmtec Flat Sheet Membrane, SW30HRLE, PA-TFC, RO, 305 x 305mm, 1/Pk	SW30HRLE	Polyamide-TFC	305x305mm	1	5-7 days	$127.20	View Details
1122061	Dow Filmtec Flat Sheet Membrane, SW30HRLE, PA-TFC, RO, 47mm, 5/pk	SW30HRLE	Polyamide-TFC	47mm	5	5-7 days	$83.88	View Details
1122062	Dow Filmtec Flat Sheet Membrane, SW30HRLE, PA-TFC, RO, 90mm, 5/pk	SW30HRLE	Polyamide-TFC	90 mm	5	5-7 days	$227.93	View Details
1122063	Dow Filmtec Flat Sheet Membrane, SW30HRLE, PA-TFC, RO, CF016, 5/pk	SW30HRLE	Polyamide-TFC	CF016	5	5-7 days	$167.78	View Details
1122064	Dow Filmtec Flat Sheet Membrane, SW30HRLE, PA-TFC, RO, CF042, 5/pk	SW30HRLE	Polyamide-TFC	CF042	5	5-7 days	$167.78	View Details
1122065	Dow Filmtec Flat Sheet Membrane, SW30HRLE, PA-TFC, RO, Sepa, 5/pk	SW30HRLE	Polyamide-TFC	Sepa	5	5-7 days	$296.26	View Details
1122067	Dow Filmtec Flat Sheet Membrane, SW30XFR, PA-TFC, RO, 305 x 305mm, 1/Pk	SW30XFR	Polyamide-TFC	305x305mm	1	5-7 days	$127.20	View Details
1122068	Dow Filmtec Flat Sheet Membrane, SW30XFR, PA-TFC, RO, 47mm, 5/pk	SW30XFR	Polyamide-TFC	47mm	5	5-7 days	$83.88	View Details
1122069	Dow Filmtec Flat Sheet Membrane, SW30XFR, PA-TFC, RO, 90mm, 5/pk	SW30XFR	Polyamide-TFC	90 mm	5	5-7 days	$227.93	View Details
1122070	Dow Filmtec Flat Sheet Membrane, SW30XFR, PA-TFC, RO, CF016, 5/pk	SW30XFR	Polyamide-TFC	CF016	5	5-7 days	$167.78	View Details
1122071	Dow Filmtec Flat Sheet Membrane, SW30XFR, PA-TFC, RO, CF042, 5/pk	SW30XFR	Polyamide-TFC	CF042	5	5-7 days	$167.78	View Details
1122072	Dow Filmtec Flat Sheet Membrane, SW30XFR, PA-TFC, RO, Sepa, 5/pk	SW30XFR	Polyamide-TFC	Sepa	5	5-7 days	$296.26	View Details
YMSW30XLE4060	Dow Filmtec Flat Sheet Membrane, SW30XLE, PA-TFC, RO, 1016 x 1524mm, 1/Pk	SW30XLE	Polyamide-TFC	1016 x 1524mm	1	2 weeks	$538.44	View Details
YMSW30XLE3001	Dow Filmtec Flat Sheet Membrane, SW30XLE, PA-TFC, RO, 305 x 305mm, 1/Pk	SW30XLE	Polyamide-TFC	305x305mm	1	2 weeks	$127.20	View Details
YMSW30XLE475	Dow Filmtec Flat Sheet Membrane, SW30XLE, PA-TFC, RO, 47mm, 5/Pk	SW30XLE	Polyamide-TFC	47mm	5	2 weeks	$83.88	View Details
1121038	Dow Filmtec Flat Sheet Membrane, SW30XLE, PA-TFC, RO, CF016, 5/Pk	SW30XLE	Polyamide-TFC	CF016	5	2 weeks	$167.78	View Details
YMSW30XLE4205	Dow Filmtec Flat Sheet Membrane, SW30XLE, PA-TFC, RO, CF042, 5/Pk	SW30XLE	Polyamide-TFC	CF042	5	2 weeks	$167.78	View Details
YMSW30XLE1905	Dow Filmtec Flat Sheet Membrane, SW30XLE, PA-TFC, RO, Sepa, 5/Pk	SW30XLE	Polyamide-TFC	Sepa	5	2 weeks	$296.26	View Details
YMACM23001	TriSep Flat Sheet Membrane, ACM2, PA, RO, 1016 x 305mm, 1/Pk	ACM2	Polyamide-TFC	1016x305mm	1	5-7 days	$152.52	View Details
YMACM2475	TriSep Flat Sheet Membrane, ACM2, PA, RO, 47mm, 5/Pk	ACM2	Polyamide-TFC	47mm	5	5-7 days	$83.88	View Details
1121978	TriSep Flat Sheet Membrane, ACM2, PA, RO, 90mm, 5/Pk	ACM2	Polyamide-TFC	90 mm	5	5-7 days	$227.93	View Details
1120973	TriSep Flat Sheet Membrane, ACM2, PA, RO, CF016, 5/Pk	ACM2	Polyamide-TFC	CF016	5	5-7 days	$167.78	View Details
YMACM24205	TriSep Flat Sheet Membrane, ACM2, PA, RO, CF042, 5/Pk	ACM2	Polyamide-TFC	CF042	5	5-7 days	$167.78	View Details
YMACM21905	TriSep Flat Sheet Membrane, ACM2, PA, RO, Sepa, 5/Pk	ACM2	Polyamide-TFC	Sepa	5	5-7 days	$296.26	View Details
YMACM33001	TriSep Flat Sheet Membrane, ACM3, PA, RO, 1016 x 305mm, 1/Pk	ACM3	Polyamide-TFC	1016x305mm	1	5-7 days	$152.52	View Details
YMACM3475	TriSep Flat Sheet Membrane, ACM3, PA, RO, 47mm, 5/Pk	ACM3	Polyamide-TFC	47mm	5	5-7 days	$83.88	View Details
1121980	TriSep Flat Sheet Membrane, ACM3, PA, RO, 90mm, 5/Pk	ACM3	Polyamide-TFC	90 mm	5	5-7 days	$227.93	View Details
1120974	TriSep Flat Sheet Membrane, ACM3, PA, RO, CF016, 5/Pk	ACM3	Polyamide-TFC	CF016	5	5-7 days	$167.78	View Details
YMACM34205	TriSep Flat Sheet Membrane, ACM3, PA, RO, CF042, 5/Pk	ACM3	Polyamide-TFC	CF042	5	5-7 days	$167.78	View Details
YMACM31905	TriSep Flat Sheet Membrane, ACM3, PA, RO, Sepa, 5/Pk	ACM3	Polyamide-TFC	Sepa	5	5-7 days	$296.26	View Details
YMACM43001	TriSep Flat Sheet Membrane, ACM4, PA, RO, 1016 x 305mm, 1/Pk	ACM4	Polyamide-TFC	1016x305mm	1	5-7 days	$152.52	View Details
YMACM4475	TriSep Flat Sheet Membrane, ACM4, PA, RO, 47mm, 5/Pk	ACM4	Polyamide-TFC	47mm	5	5-7 days	$83.88	View Details
1121982	TriSep Flat Sheet Membrane, ACM4, PA, RO, 90mm, 5/Pk	ACM4	Polyamide-TFC	90 mm	5	5-7 days	$227.93	View Details
1120975	TriSep Flat Sheet Membrane, ACM4, PA, RO, CF016, 5/Pk	ACM4	Polyamide-TFC	CF016	5	5-7 days	$167.78	View Details
YMACM44205	TriSep Flat Sheet Membrane, ACM4, PA, RO, CF042, 5/Pk	ACM4	Polyamide-TFC	CF042	5	5-7 days	$167.78	View Details
YMACM41905	TriSep Flat Sheet Membrane, ACM4, PA, RO, Sepa, 5/Pk	ACM4	Polyamide-TFC	Sepa	5	5-7 days	$296.26	View Details
YMACM53001	TriSep Flat Sheet Membrane, ACM5, PA, RO, 1016 x 305mm, 1/Pk	ACM5	Polyamide-TFC	1016x305mm	1	5-7 days	$152.52	View Details
YMACM5475	TriSep Flat Sheet Membrane, ACM5, PA, RO, 47mm, 5/Pk	ACM5	Polyamide-TFC	47mm	5	5-7 days	$83.88	View Details
1121984	TriSep Flat Sheet Membrane, ACM5, PA, RO, 90mm, 5/Pk	ACM5	Polyamide-TFC	90mm	5	5-7 days	$227.93	View Details
1120976	TriSep Flat Sheet Membrane, ACM5, PA, RO, CF016, 5/Pk	ACM5	Polyamide-TFC	CF016	5	5-7 days	$167.78	View Details
YMACM54205	TriSep Flat Sheet Membrane, ACM5, PA, RO, CF042, 5/Pk	ACM5	Polyamide-TFC	CF042	5	5-7 days	$167.78	View Details
YMACM51905	TriSep Flat Sheet Membrane, ACM5, PA, RO, Sepa, 5/Pk	ACM5	Polyamide-TFC	Sepa	5	5-7 days	$296.26	View Details
YMSB503001	TriSep Flat Sheet Membrane, SB50, CA Blend, RO, 1016 x 305mm, 1/Pk	SB50	Cellulose acetate blend	1016x305mm	1	5-7 days	$152.52	View Details
YMSB50475	TriSep Flat Sheet Membrane, SB50, CA Blend, RO, 47mm, 5/Pk	SB50	Cellulose acetate blend	47mm	5	5-7 days	$83.88	View Details
1121986	TriSep Flat Sheet Membrane, SB50, CA Blend, RO, 90mm, 5/Pk	SB50	Celulose Acetate Blend	90 mm	5	5-7 days	$227.93	View Details
1121030	TriSep Flat Sheet Membrane, SB50, CA Blend, RO, CF016, 5/Pk	SB50	Cellulose Acetate	CF016	5	5-7 days	$167.78	View Details
YMSB504205	TriSep Flat Sheet Membrane, SB50, CA Blend, RO, CF042, 5/Pk	SB50	Cellulose acetate blend	CF042	5	5-7 days	$167.78	View Details
YMSB501905	TriSep Flat Sheet Membrane, SB50, CA Blend, RO, Sepa, 5/Pk	SB50	Cellulose acetate blend	Sepa	5	5-7 days	$296.26	View Details
YMX2013001	TriSep Flat Sheet Membrane, X201, PA-UREA, RO, 1016 x 305mm, 1/Pk	X201	Polyamide-urea-TFC	1016x305mm	1	5-7 days	$152.52	View Details
YMX201475	TriSep Flat Sheet Membrane, X201, PA-UREA, RO, 47mm, 5/Pk	X201	Polyamide-urea-TFC	47mm	5	5-7 days	$83.88	View Details
1121996	TriSep Flat Sheet Membrane, X201, PA-UREA, RO, 90mm, 5/Pk	X201	Polyamide-urea-TFC	90 mm	5	5-7 days	$227.93	View Details
1121054	TriSep Flat Sheet Membrane, X201, PA-UREA, RO, CF016, 5/Pk	X201	PA-UREA	CF016	5	5-7 days	$167.78	View Details
YMX2014205	TriSep Flat Sheet Membrane, X201, PA-UREA, RO, CF042, 5/Pk	X201	Polyamide-urea-TFC	CF042	5	5-7 days	$167.78	View Details
YMX2011905	TriSep Flat Sheet Membrane, X201, PA-UREA, RO, Sepa, 5/Pk	X201	Polyamide-urea-TFC	Sepa	5	5-7 days	$296.26	View Details
YMAGSP3001	Veolia Flat Sheet Membrane, AG, PA-TFC, RO, 305 x 305mm, 1/Pk	AG	Polyamide-TFC	305x305mm	1	5-7 days	$99.94	View Details
YMAGSP475	Veolia Flat Sheet Membrane, AG, PA-TFC, RO, 47mm, 5/Pk	AG	Polyamide-TFC	47mm	5	5-7 days	$83.88	View Details
1121942	Veolia Flat Sheet Membrane, AG, PA-TFC, RO, 90mm, 5/Pk	AG	Polyamide-TFC	90 mm	5	5-7 days	$227.93	View Details
1120977	Veolia Flat Sheet Membrane, AG, PA-TFC, RO, CF016, 5/Pk	AG	Polyamide-TFC	CF016	5	5-7 days	$167.78	View Details
YMAGSP4205	Veolia Flat Sheet Membrane, AG, PA-TFC, RO, CF042, 5/Pk	AG	Polyamide-TFC	CF042	5	5-7 days	$167.78	View Details
YMAGSP1905	Veolia Flat Sheet Membrane, AG, PA-TFC, RO, Sepa, 5/Pk	AG	Polyamide-TFC	Sepa	5	5-7 days	$310.37	View Details
YMAKSP3001	Veolia Flat Sheet Membrane, AK, PA-TFC, RO, 305 x 305mm, 1/Pk	AK	Polyamide-TFC	305x305mm	1	5-7 days	$99.94	View Details
YMAKSP475	Veolia Flat Sheet Membrane, AK, PA-TFC, RO, 47mm, 5/Pk	AK	Polyamide-TFC	47mm	5	5-7 days	$83.88	View Details
1121944	Veolia Flat Sheet Membrane, AK, PA-TFC, RO, 90mm, 5/Pk	AK	Polyamide-TFC	90 mm	5	5-7 days	$227.93	View Details
1120978	Veolia Flat Sheet Membrane, AK, PA-TFC, RO, CF016, 5/Pk	AK	Polyamide-TFC	CF016	5	5-7 days	$167.78	View Details
YMAKSP4205	Veolia Flat Sheet Membrane, AK, PA-TFC, RO, CF042, 5/Pk	AK	Polyamide-TFC	CF042	5	5-7 days	$167.78	View Details
YMAKSP1905	Veolia Flat Sheet Membrane, AK, PA-TFC, RO, Sepa, 5/Pk	AK	Polyamide-TFC	Sepa	5	5-7 days	$310.37	View Details
1120717	Veolia Flat Sheet Membrane, AP, PA-TFC, RO, 47mm, 5/Pk	AP	Polyamide-TFC	47mm	5	5-7 days	$83.88	View Details
1121946	Veolia Flat Sheet Membrane, AP, PA-TFC, RO, 90mm, 5/Pk	AP	Polyamide-TFC	90 mm	5	5-7 days	$191.15	View Details
1120715	Veolia Flat Sheet Membrane, AP, PA-TFC, RO, CF042, 5/Pk	AP	Polyamide-TFC	CF042	5	5-7 days	$167.78	View Details
YMSESP3001	Veolia Flat Sheet Membrane, SE, PA-TFC, RO, 305 x 305mm, 1/pk	SE	Polyamide-TFC	305x305mm	1	5-7 days	$99.94	View Details
YMSESP475	Veolia Flat Sheet Membrane, SE, PA-TFC, RO, 47mm, 5/Pk	SE	Polyamide-TFC	47mm	5	5-7 days	$83.88	View Details
1121956	Veolia Flat Sheet Membrane, SE, PA-TFC, RO, 90mm, 5/Pk	SE	Polyamide-TFC	90 mm	5	5-7 days	$227.93	View Details
1121034	Veolia Flat Sheet Membrane, SE, PA-TFC, RO, CF016, 5/Pk	SE	Polyamide-TFC	CF016	5	5-7 days	$167.78	View Details
YMSESP4205	Veolia Flat Sheet Membrane, SE, PA-TFC, RO, CF042, 5/Pk	SE	Polyamide-TFC	CF042	5	5-7 days	$167.78	View Details
YMSESP1905	Veolia Flat Sheet Membrane, SE, PA-TFC, RO, Sepa, 5/Pk	SE	Polyamide-TFC	Sepa	5	5-7 days	$310.37	View Details

Frequently Asked Questions

Q: I have a membrane sample that is too large to fit in my stirred cell. Can I cut it to fit?

Yes—flat sheet membranes can be cut to fit your stirred cell. For best results, use the stirred cell support disk as a template to trace the correct size, then cut the membrane carefully to match.

Q: I have a polymeric stirred cell and discovered that my disk size is not listed in the ordering information for the flat sheet membranes. Can I purchase the flat sheet membranes in the correct disk size for my stirred cell?

Yes, we can supply the flat sheet membranes in the correct disk size for your stirred cell. Please contact us at [email protected] for pricing and availability.

Q: How do I store used flat sheet crossflow membranes?

Used flat sheet crossflow membranes must be stored wet at all times. If a membrane is allowed to dry out, it can irreversibly lose water permeability and performance.

For storage, place the membrane fully submerged in one of the following solutions:
0.5% formaldehyde solution (helps prevent microbial growth)
1.0% sodium metabisulfite (SMBS) solution -- Replace the SMBS solution monthly to maintain effectiveness

UPDI water (ultrapure deionized water)--Replace the water weekly to reduce contamination and biofouling

Q: Are the flat sheet membranes available as roll stock?

Yes, we are able to offer some of the flat sheet membranes as roll stock. Please contact us at [email protected] to inquire about pricing and availability.

Q: Why is the flat sheet membrane I'm using measuring a flux value less than the published flux value?

Flow characteristics for a spiral element and flat sheet membrane are significantly different and are really only comparable on a qualitative basis. Variability in the membrane manufacturing process, differences in water composition, test procedures, and test equipment, used in a factory, laboratory, or elsewhere, will impact water flux results.

Reference: Understanding Variation of Experimental Flux and Rejection

Q: Do you offer samples of the flat sheet cross flow membranes?

We do not offer complimentary samples of the flat sheet crossflow membranes. However, most customers find the standard pack quantities to be quite reasonable for initial evaluations. For customers that want to evaluate several different membranes, we do offer custom variety packs. And, in some instances, we may be able to offer custom packs containing smaller sheet quantities. Please contact us to inquire about pricing and availability.

Q: What is the shelf life for the flat sheet crossflow membranes?

Sterlitech flat sheet crossflow membranes should be stored sealed in the original packaging in a climate-controlled environment, protected from direct light, heat, and temperature extremes. While we recommend using membranes as soon as practical after receipt, most flat sheet membranes can typically be stored for up to one (1) year without affecting performance when stored properly.

Q: We noticed that there are water drops in the flat sheet membrane sealed bag. Is that a quality issue?

Some manufacturers supply their membrane in wet to prevent the membrane from going dry. There is always moisture in these sealed bags and it is not uncommon for some condensation (droplets) to form.

Q: How should I remove the preservative solution from the membrane and is there any specific recommendations before use?

Rinsing the membrane on both sides with a stream of clean water is sufficient to remove the preservative solution. There is no need to pre-condition.

Q: The Flat Sheet Membranes appear dry in their packaging. How do I pre-wet them? Do I need to do this?

Yes, you need to pre-wet the membranes. The best procedure is to place them in a dry holder and allow them to wet from the inlet side first. It may be best to perform this operation with water or a buffer, then dispose of the first rinse, and introduce the process fluid. This prevents any wetting agents or preservatives from mixing with the process solution.

Q: Can I reuse flat sheet membranes after they have been removed from a test cell?

Yes, you may attempt to reuse flat sheet membranes. However, you may find it difficult to achieve a leak free seal. The cell body o-rings necessarily compress the membrane during installation and the physical action of separating the membrane from the o-rings during removal may cause damage. This damage can impede that ability to achieve a leak free seal when the membrane is reused.

Q: I accidentally allowed my flat sheet crossflow membrane to dry out. Can I still use it?

Unfortunately, allowing a previously wetted crossflow membrane to dry usually results in permanent reduction of water permeability. Nevertheless, you can attempt to re-wet the membrane and use it. First, soak the membrane in a 50% alcohol solution for at least 15min (ethanol, methanol, or IPA would be acceptable). Next, install the membrane in the test cell and operate the cell with purified deionized water as though you were pre-conditioning the membrane. After about 30min, the permeate flux should stabilize to whatever rate the membrane is now capable of.

Q: How do I clean the flat sheet membranes?

Determining which solution to use to clean a flat sheet membrane depends on the substance it is fouled with. As a general rule, you can use a caustic or oxidant solution for organic fouling and an acidic solution for inorganic causes. Please remember that different membranes polymers have different pH tolerances.

Q: Do I need to pre-condition the flat sheet membranes? And, if so, what is the recommended procedure?

Yes, for flat sheet membranes that will be used with water or aqueous solutions, we recommend that you pre-condition the membranes prior to conducting your separation experiments. Pre-conditioning helps ensure that the membranes perform as expected. Also, pre-conditioning removes preservatives and other residuals from the membranes. Purified deionized water is used to pre-condition the membranes. For all flat sheet membranes except the forward osmosis (FO) membranes, install the membrane in the test cell and apply the purified deionized water feed at the normal operating rate and pressure for the membrane. Allow the system to operate with the purified deionized water feed until the permeate flux stabilizes at an expected value. You can now replace the purified deionized water feed with your feed solution and begin your experiments.

Q: What is the recommended cross flow velocity (CFV) for the flat sheet membranes?

Most membrane manufacturers recommend CFVs of 5 to 35cm/s for their spiral wound membrane elements. The flat sheet membranes can be operated in this range to simulate use in such elements. Additionally, the flat sheet membranes may be operated outside of this range by users that want to examine the relationship between CVF and fouling and membrane performance in their applications.

Q: How do I calculate the cross flow velocity (CFV) for flat sheet membranes?

Cross flow velocity (CFV) is the linear velocity of the feed flow tangential to the membrane surface and is typically reported in m/sec or ft/sec. It is calculated by dividing the volumetric flow rate through the feed channel by the cross-sectional area of the feed channel. Please refer to the CFV article at Tech Tips for more information.

Q: What is the recommended transmembrane pressure (TMP) for the flat sheet membranes?

The recommended TMP will depend on the type of flat sheet membrane and on the application. Typically, a reasonable TMP will be the same as that noted for the permeate flux specification of the membrane. The specifications for any of the flat sheet membranes can be easily found on our website by clicking the “application/specification” tab on the product web page and scrolling down as necessary. Please contact us at [email protected] if you need additional assistance.

Q: I have noticed that the flat sheet membranes come in sizes described as CF016, CF042, and Sepa CF. What are these sizes?

These membrane sizes are intended for use in the bench-scale crossflow test cells offered by Sterlitech. Please see the list of flat sheet membranes we offer and their dimensions: HP4750 Stirred Cell: 47 mm (1.85") discs, CF016 cell: 58 x 75 mm (2.26 x 2.95") coupons, CF042 cell: 56 x 115 mm (2.20 x 4.53") coupons, Sepa CF cell: 140 x 190 mm (5.51 x 7.48") coupons, CF047 circular cell: 47 mm discs, CF090 circular cell: 90 mm discs

Frequently Asked Questions

Q: I have a membrane sample that is too large to fit in my stirred cell. Can I cut it to fit?

Q: I have a polymeric stirred cell and discovered that my disk size is not listed in the ordering information for the flat sheet membranes. Can I purchase the flat sheet membranes in the correct disk size for my stirred cell?

Q: How do I store used flat sheet crossflow membranes?

Q: Are the flat sheet membranes available as roll stock?

Q: Why is the flat sheet membrane I'm using measuring a flux value less than the published flux value?

Q: Do you offer samples of the flat sheet cross flow membranes?

Q: What is the shelf life for the flat sheet crossflow membranes?

Q: We noticed that there are water drops in the flat sheet membrane sealed bag. Is that a quality issue?

Q: How should I remove the preservative solution from the membrane and is there any specific recommendations before use?

Q: The Flat Sheet Membranes appear dry in their packaging. How do I pre-wet them? Do I need to do this?

Q: Can I reuse flat sheet membranes after they have been removed from a test cell?

Q: I accidentally allowed my flat sheet crossflow membrane to dry out. Can I still use it?

Q: How do I clean the flat sheet membranes?

Q: Do I need to pre-condition the flat sheet membranes? And, if so, what is the recommended procedure?

Q: What is the recommended cross flow velocity (CFV) for the flat sheet membranes?

Q: How do I calculate the cross flow velocity (CFV) for flat sheet membranes?

Q: What is the recommended transmembrane pressure (TMP) for the flat sheet membranes?

Q: I have noticed that the flat sheet membranes come in sizes described as CF016, CF042, and Sepa CF. What are these sizes?

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Frequently Asked Questions

Q: I have a membrane sample that is too large to fit in my stirred cell. Can I cut it to fit?

Q: I have a polymeric stirred cell and discovered that my disk size is not listed in the ordering information for the flat sheet membranes. Can I purchase the flat sheet membranes in the correct disk size for my stirred cell?

Q: How do I store used flat sheet crossflow membranes?

Q: Are the flat sheet membranes available as roll stock?

Q: Why is the flat sheet membrane I'm using measuring a flux value less than the published flux value?

Q: Do you offer samples of the flat sheet cross flow membranes?

Q: What is the shelf life for the flat sheet crossflow membranes?

Q: We noticed that there are water drops in the flat sheet membrane sealed bag. Is that a quality issue?

Q: How should I remove the preservative solution from the membrane and is there any specific recommendations before use?

Q: The Flat Sheet Membranes appear dry in their packaging. How do I pre-wet them? Do I need to do this?

Q: Can I reuse flat sheet membranes after they have been removed from a test cell?

Q: I accidentally allowed my flat sheet crossflow membrane to dry out. Can I still use it?

Q: How do I clean the flat sheet membranes?

Q: Do I need to pre-condition the flat sheet membranes? And, if so, what is the recommended procedure?

Q: What is the recommended cross flow velocity (CFV) for the flat sheet membranes?

Q: How do I calculate the cross flow velocity (CFV) for flat sheet membranes?

Q: What is the recommended transmembrane pressure (TMP) for the flat sheet membranes?

Q: I have noticed that the flat sheet membranes come in sizes described as CF016, CF042, and Sepa CF. What are these sizes?

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