Cellulose Nitrate (CN) Membrane Filters, Sterile, 0.8 Micron, 47mm, 100/Pk
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Frequently Asked Questions
Q: What are the advantages of MCE Membranes?
MCE membrane filters offer fast flow rates, high protein-binding capacity, and strong thermal stability, making them a common choice for environmental and biological laboratory filtration. They’re available as presterilized, individually wrapped membranes, and gridded MCE filters can be used for easy microbial colony counting and quantification.
Q: What is the maximum temperature for the different filter membranes?
The maximum operating temperatures for Sterlitech filter membranes are listed below.
- Sterlitech Silver Metal - 427°C
- Sterlitech Ceramic - 350°C
- Sterlitech Polycarbonate Track Etch - 140°C
- Sterlitech Polyester - 140°C
- Sterlitech Nitrocellulose (MCE) - 130°C
- Sterlitech Nylon - 180°C
- Sterlitech Polyethersulfone (PES) - *130°C
- Sterlitech Polypropylene - 82°C
- Sterlitech Cellulose Acetate - 135°C
- Sterlitech PTFE (Laminated) - 130°C
- Sterlitech PTFE (Unlaminated) - 260°C
*5.0um and 8.0um - max temp is 180°C
Q: Do mixed cellulose esters (MCE) membrane filters have a limited shelf life?
Q: What is the shelf life of your membranes?
Cellulose acetate (CA) and nitrocellulose (MCE) membranes will last 2 1/2 to 3 years before reverting to their natural hydrophobic states. Nylon, on the other hand, is naturally hydrophilic so it does not have a shelf life.
An easy test for older membranes is to perform a "wetting out" test. Dipping a small portion of the membrane into water (hydrophilic membranes) or an alcohol (hydrophobic membranes) works well. If the membrane absorbs the material, or "wets out", it has not gone past the shelf life.
Q: Can mixed cellulose esters (MCE) membrane filters be substituted for nitrocellulose (NC) membrane filters?
Ideally, nitrocellulose (NC) membranes would be made entirely of nitrocellulose polymer. However, almost all commercially available filtration grade membrane filters labeled as “nitrocellulose” are actually composed of membranes made with a mixture of nitrocellulose and cellulose acetate polymers. This is because pure nitrocellulose membrane filters are very difficult to manufacture with acceptable characteristics.
In an effort to provide clarity to consumers, some manufactures refer to membranes containing a mixture of nitrocellulose and cellulose acetate polymers as mixed cellulose esters (MCE) membranes. In almost all filtration applications, mixed cellulose esters (MCE) membrane filters are equivalent to nitrocellulose (NC) membrane filters.
Q: Do you need a Chemical Compatibility Chart?
We have a Chemical Compatibility Chart that you can use for reference.
Q: Does Sterlitech offer mixed cellulose esters (MCE) membrane disk filters with custom diameters?
Unfortunately, in most instances, we are unable to supply the MCE membrane filters with custom diameters. Please inquire with your Sterlitech sales representative about alternatives.
Q: Why are non-sterile MCE Membrane filters more expensive than presterilized MCE membranes filters?
Sterile mixed cellulose esters (MCE) membrane filters are used in vast quantities for microbiological studies across many industries and are manufactured in very high volumes to accommodate this demand. Economies of scale and process automation allow the sterile MCE membrane filters to be offered at lower pack costs compared to non-sterile MCE membrane filters. Non-sterile MCE filters are used much less frequently, necessitating less efficient, smaller volume manufacturing runs and packaging methods. Consequently, the non-sterile MCE membrane filters have intrinsically greater manufacturing costs and must be offered at higher prices.
Q: Which membranes are recommended for gravimetric analysis?
A. We have several membranes to recommend for gravimetric analysis.
- Mixed Cellulose Esters (MCE) Membrane Filters, Plain: In gravimetric analysis using ashing techniques, (MCE) Nitrocellulose filters yield a residue of less than 0.045% of their initial weight. They are hydrophilic with a non-cytotoxic wetting agent extractable level of less than 4% of their weight.
- Polycarbonate Track-Etch Membranes (PCTE) - 25mm: Polycarbonate Track-Etch or our Polyester Track-Etch (PETE) membranes are two membranes that offer exceptionally low tare weights, are non-hygroscopic, and exhibit extremely low absorption and adsorption losses.
Since these membranes are non-hygroscopic, they are particularly well suited for gravimetric analysis. They do not require drying when used directly out of the package. If they are wet, they can be dried rapidly and will not pick up moisture from the air during weighing. - Glass Fiber Filters & Prefilters: Glass fiber filters without binders are recommended for analytical and gravimetric determinations.
Q: What's the benefit of purchasing sample packs?
Sample packs allow the customer to purchase small quantities of membrane filters at nominal cost, with various diameters and pore sizes as selected. This allows the customer to preform trials as needed to determine the optimal filter for their application before committing to purchasing standard pack quantities.
Q: Are membrane filter samples available in diameters others than 13, 25, or 47mm?
In most cases, membrane filter samples can be purchased in sizes that are not listed in the standard sample packs. Please contact us at [email protected] to inquire about availability and pricing.
