MEMBRANE FILTER
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  FILTERMEMBRANE FILTERHM Membrane Filter |
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HM MEMBRANE FILTER
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The pore size of membrane
filters is indicated by testing in
three different ways.
For example, Microorganism
sampling (actual filtration for
microorganism), Porosimeter
(measuring changes of air
pressure on filters / air flow)
and Bubble point (pressure
when air emits through a pore
size of a wet filter)
 As many fine holes are open, it is suitable to sample microorganism or particles.
A membrane filter has a porous film shape. Unlike filter paper which is formed with meshed fibers, it has a structure
of circular
holes connected to each other.
PTFE membranes are largely divided into four types: PTFE-H (hydrophilic), PTFE-J (thin membranes supported),
PTFE-D (thick membranes supported), and PTFE-T (strong thermal resistance)
(Select a proper filter depending on solvents. Selecting filters is an important factor for successful analysis.)
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| Type |
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MCE |
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PES |
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CA |
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PVDF |
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PVDF-D |
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Hydrophilic |
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Hydrophilic |
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Hydrophilic |
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Hydrophilic/
Mild
organic
solvents |
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Hydrophobic/
Mild
organic
solvents |
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| Binding |
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high |
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low |
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low |
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very low |
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low |
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Chemical
Compatibility |
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PH(3.5~8)
Restrictive |
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PH(1~14)
Restrictive |
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Restrictive |
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well |
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well |
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| Applications |
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General
filtration,
aqueous
solutions,
board
experiments,
particle,
micro
organism |
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Aqueous
solutions,
filtration of
alcoho
l
media solvents,
filtration
sterilization of
medium and
sample solution,
low protein
absorption |
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Biochemical
experiments
or alcohol
media,
particle
removal tests |
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Aqueous solutions,
mild organic
solvents, HPLC
sample,
prefiltration,
low
protein
absorption |
|
Hydrophobic,
filter
used for
mild organic
solvents |
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| SEM Image |
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| Type |
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Nylon |
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PTFE-D |
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PTFE-J |
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PTFE-H |
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PTFE-T |
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Hydrophilic/
Mild
polarity
organic solvents |
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Organic solvents |
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Hydrophilic+
Organic solvents |
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Organic solvents |
|
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| Binding |
|
medium |
|
low |
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low |
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low |
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low |
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Chemical
Compatibility |
|
well |
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very well |
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very well |
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very well |
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the best |
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| Applications |
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Hydrophilic,
purification
of mild
organic
solvents,
high protein
absorption |
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Mild organic
solvents,
easy
to handle
due
to thick
membrane,
air vent and
all
type of
solvents |
|
Mild organic
solvents,
air
vent,
electric,
chemical |
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Filtration of water
or mixed solvents
in HPLC sample,
acid, alkali
particles |
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Mild organic
solvents, excellent
chemical
resistance,
high
temperature,
special reagents,
acid, alkali |
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| SEM Image |
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