|
|
|
|
|
 |
|
|
Membranes act like a sieve: certain particles or molecules
are retained while others can pass the pores. In order to ensure the quality of the products from Membrana
all membranes are regularly controlled optically and tested extensively by special methods.
|
|
|
 Permeability
|
|
|
The number of pores and the mean pore size are estimated
by flow rate measurement using clean liquids (water, isopropanol).
|
|
|
 |
Maximum pore size
|
|
|
|
The maximum pore size is based either upon the retention properties
of special molecules e.g. albumin, Cytochrome C and dextran, or, on bubble pressure measurements.
|
|
|
|
Haemocompatibility
|
|
|
|
The biological suitability of any polymer intended for a medical
application must be known as early as possible.
|
|
Membranes for blood-contacting applications are screened and characterised in term of their compatibility
with human blood using in vitro methods.
|
|
|
Mechanical strength
|
|
|
Membrane processing is assured by regularly evaluating the mechanical
properties (break strength, burst pressure, shrinking, dimensions).
|
|
|
Extractables
|
|
|
Elaborate analytical methods are used to ensure minimal extractables
(e.g. heavy metals, oligomers, solvents) from the membranes.
|
|
|
Special testing
|
|
|
According to the requirements of our customers, new methods are continuously being developed
to test special properties, for instance self sealing and leak testing of dialysers etc.
|
