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General Electric (GE) - Biosciences Whatman Filtration Schleicher Schuell (S&S) - Laboratory Filters
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| Stock Symbol GE
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20-20 Whatman House
St Leonards Rd
Maidstone, Kent (UK) ME16 OLS
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| Phone: |
44 162267 6670 |
| Fax: |
44 162267 7011 |
| Company Description |
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General Electric Biosciences Whatman Schleicher Schuell $220 Million US Dollar sales 1100 employees, filter papers, membrane filters, laboratory syringe filters, microbiological quality control, blotting multiwell plates, crossflow filtration |
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Paper and Membrane
Filters
for
Sample Preparation, CrossFlow Filtration and Microbiology
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Paper filtration
Filter papers for thimbles retain impurities on their surfaces and in the
filter matrix. They are also often known as deep-bed filters, have a high
particle retention capacity and allow a large sample throughput. As the
filtration progresses the impurities accumulate on the filter and
influence the filtering properties. A secondary filter bed is formed in
the randomly arranged fibers of the deep-bed filter. This means that it is
not possible to give a nominal pore size for deep-bed filter. For
orientation purposes we have given retention ranges in the product
overview; however, these only apply at the start of filtration. Our range
includes deep-bed filters with a retention range from 1 up to approx. 30
µm.
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Membrane filtration
With membrane filters filtration mainly occurs on the filter surface.
Particles which are larger than the nominal pore size remain on the
filter, smaller particles pass through it unless other interactions within
the filter retain them in the matrix. The integrity of membrane filters
can be checked. Filtration is noticeably slower than with deep-bed
filters. Our range includes membrane filters with pore size from 0.1 to 12
µm.
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Ready-to-use filter units
The membrane filter and filtration apparatus from a pre-assembled unit.
This is the ideal and time-saving solution wherever a lot of samples have
to be filtered; it is also a real alternative if filtration is only
carried out occasionally. The filter and apparatus are perfectly matched
to each other; the sterile filter units offer the best product protection
available. Our ready-to-use filter units correspond to the 'plug and play'
technique found in the computer world. They are available for samples
volumes from 1 µl to 500 ml.
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Special laboratory products
For a variety of applications we offer special laboratory products made of
paper. These have
been developed for specific use (e.g. chromatography or seed testing) and
their properties
have been optimized to meet the requirements of the special application.
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Microbiological Quality
Control
Schleicher & Schuell MicroScience offers a broad range of high quality products for
Microbiological Quality Control in food & beverage, pharma and water testing.
We develop solutions for microbiological
applications and set today's standards in many areas. This is a result of long-term
relationships with our customers who give the input to new ideas and
product improvements.
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CrossFlow filtration
The CrossFlow filtration (tangential flow filtration) involves recirculation
of the feed stream pumped across the membrane surface. The "sweeping
action" created by fluid flow across the membrane surface promotes
consistent productivity over the long term. Tangential flow, which is
utilized in ULTRAN® cassettes, creates a gentle turbulence at
the membrane surface, thus minimizing concentration polarization.
ULTRAN®- membrane cassettes are available in a wide range of
ultrafiltration (5 - 500 kD) and microfiltration (0.1 - 0.45 µm) pore
sizes. |
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