Membrane Separation Technology for Research and Quality Control

Membrane filters
Gridded Membranes, sterile and
individually packed, for colony counts
Sterile, individually packed membrane
filters have long become
standard for routine microbiological
quality control because of the user
benefits they offer. They are ready-touse
and save preparatory time, they
avoid the possibility of contamination
of remaining filters in opened packs
and are GLP conform, having filter
identification and lot number printed
on each individual envelope.
The ultra-modern packaging machine
recently installed by Sartorius was
designed specifically for this type of
packaging. It complements the userbenefits
with automatic, in-line quality
assurance. Each membrane is
checked to ensure it is not damaged
in any way, is positioned correctly
with no slippage under the edge
seal, has perfect grid printing and is
free from particles. Each envelope is
checked for readable lettering.
The membrane filters
All of the gridded membranes are
made of cellulose nitrate, a material
which assures excellent retention and
optimum colony growth. Their basic
specifications are as for the appropriate
pore size type 113 membranes
described on page 68. The grid
size is 3.1 x 3.1 mm. The various
colours allow the one to be chosen
which gives the best contrast to the
colonies which are to be counted
(see, for example, the membranes
selected for the various Nutrient Pad
Sets, page 76).
Hydrophobic edge membranes are
used mainly in the sterility testing of
solutions containing antibiotics.
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ORDER NUMBERS
for sterile, individually packed
membrane filters
1. Type 114, white with black grid,
for colony counts
47 mm diameter discs:
a) In packs of 100
11403-047ACN 1.2 µm
11404-047ACN 0.8 µm
11405-047ACN 0.65 µm
11406-047ACN 0.45 µm
11407-047ACN 0.2 µm
b) In packs of 1000
11403-047ACR 1.2 µm
11404-047ACR 0.8 µm
11406-047ACR 0.45 µm
50 mm diameter discs:
a) In packs of 100
11404-050ACN 0.8 µm
11405-050ACN 0.65 µm
11406-050ACN 0.45 µm
11407-050ACN 0.2 µm
b) In packs of 1000
11406-050ACR 0.45 µm
2. Type 130, gray (black when wet)
with white grid, for the detection
of yeasts and moulds
47 mm diameter discs:
a) In packs of 100
13004-047ACN 0.8 µm
13005-047ACN 0.65 µm
13006-047ACN
b) In packs of 1000
0.45 µm
13004-047ACR 0.8 µm
13006-047ACR 0.45 µm
50 mm diameter discs:
a) In packs of 100
13004-050ACN 0.8 µm
13005-050ACN 0.65 µm
13006-050ACN
b) In packs of 1000
0.45 µm
13005-050ACR 0.65 µm
13006-050ACR 0.45 µm
3. Type 131, white with black grid
and pink-coloured hydrophobic
edge, for sterility testing
3a. With 3 mm hydrophobic edge
47 mm diameter discs,
in packs of 100:
13106-047ACN 0.45 µm
13107-047ACN 0.2 µm
50 mm diameter discs
in packs of 100:
13106-050ACN 0.45 µm
13107-050ACN 0.2 µm
3b. With 6 mm hydrophobic edge
47 mm diameter discs,
in packs of 100:
13106-047HCN 0.45 µm