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D7884 Sigma

Dialysis tubing, benzoylated

Avg. flat width 32 mm (1.27 in.)



Related Categories Core Bioreagents, Dialysis, Dialysis Tubing, Labware, Life Science Reagents for DNA/RNA Electrophoresis,
capacity   ~100 mL/ft
pore size   2000 NMWCO
storage temp.   2-8°C


Frequently Asked Questions

Frequently Asked Questions are available for this Product.


Cellulose tubing, benzoylated to reduce pore size. Useful for separating compounds with a molecular weight of ≤1,200 from compounds with a molecular weight >2,000.


Supplied in a water pack containing 0.002% 1-hydroxypyridine-2-thione as preservative.

Price and Availability

Mitex PTFE Membrane Filters
Safety & Documentation

Safety Information

NONH for all modes of transport
WGK Germany 


Certificate of Analysis

Certificate of Origin

Frequently Asked Questions

Which document(s) contains shelf-life or expiration date information for a given product?
If available for a given product, the recommended re-test date or the expiration date can be found on the Certificate of Analysis. These documents are located on the product detail page under Useful Links & Tools. Click on the following link to search for a Certificate of Analysis. Please click the following link to see the details on our Product Dating Information.
How do I get lot-specific information or a Certificate of Analysis?
A Certificate of Analysis is available by lot number and can be obtained through our Advanced Search Option: http://www.sigmaaldrich.com/catalog/AdvancedSearchPage.do
Is Product D7884, Dialysis tubing benzoylated, ready to use?
The dialysis tubing has been hydrated.  A preservative is present.  It is recommended that the tubing be washed well in running water before use.
What is the internal pressure Product D7884, Dialysis tubing benzoylated, can withstand?
The tubing has a wall strength of 6-9 psi.
Can Product D7884, Dialysis tubing benzoylated, be reused?
Sigma-Aldrich does not recommend that the tubing be reused.
What is the inflated volume of Product D7884, Dialysis tubing benzoylated?
The inflated volume is approximately 100 mL/foot.
What are the retention properties of Product D7884, Dialysis tubing benzoylated?
Benzoylation reduces the size of the pores in the membrane such that the molecular weight cut-off is reduced to approximately 2 kDa.  Compounds with a molecular weight of 1200 will freely pass through the membrane.  Compounds with a molecular weight of 2000 or greater will be retained by the membrane.
After removing the preservative, can Product D7884, Dialysis tubing benzoylated, be stored for future use?
We do not recommend storing the tubing without preservative. Simply prepare the tubing and use it the same day.
Are there certain conditions to avoid when using Product D7884, Dialysis tubing benzoylated?
The tubing is sensitive to pH above 8 and should not be exposed to temperatures above 70 °C, since this may alter the pore size. Methanol will not damage the dialysis tubing and it may be used to store it. Tubing becomes brittle when allowed to dry.
How do I find price and availability?
There are several ways to find pricing and availability for our products.  Once you log onto our website, you will find the price and availability displayed on the product detail page. You can contact any of our Customer Sales and Service offices to receive a quote.  USA customers:  1-800-325-3010 or view local office numbers. 
What is the Department of Transportation shipping information for this product?
Transportation information can be found in Section 14 of the product's (M)SDS. To access the shipping information for this material, use the link on the product detail page for the product, or search here. 
My question is not addressed here, how can I contact Technical Service for assistance?
Use the option to the right to "Ask a Question" by email of a Technical Service Scientist.
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Protocols & Articles


Dialysis Tubing

Dialysis tubing is a semi-permeable membrane, usually made of cellulose acetate. It is used in dialysis, a process which involves the removal of very small molecular weight solutes from a solution, a...
Keywords: Dialysis

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