MICRODYN CAPILLARY MODULES | USER MANUAL
MANN+HUMMEL Water & Fluid Solutions | REVISION DATE: 09/09/2021
17
Resistance to chemicals
Most MICRODYN capillary modules are made of polypropylene (PP) capillary membranes potted in polyurethane, with a plastic
casing made of polypropylene. The below content is only valid for modules with PP housing. For resistance of modules with
housings made of stainless steel, polysulfone, or PVC/PVC-C, please contact your MANN+HUMMEL WFS representative.
Aromatic and aliphatic hydrocarbons with low boiling points – such as petrol ether, benzene, and carbon tetrachloride – diffuse
into the polymers of the membrane and will cause swelling and decrease mechanical strength. Before filtration of these
substances, please consult with your MANN+HUMMEL WFS representative. Exceptions include low volatile substances such as
grease, oil, and wax; these substances cause negligible swelling and little reduction to mechanical strength.
Peroxides may be used in small quantities and for short periods of time for cleaning purposes. Before applying, please consult your
MANN+HUMMEL WFS representative.
The chemical resistance of MICRODYN capillary modules is listed in the following table. The resistance depends on many factors
such as temperature, concentration, and intensity of mechanical stress. The data in the table is for reference only.
The symbols in the below table are as follows:
+
resistant at operating conditions as per data sheet
/
limited resistance, swelling (only limited operating conditions)
-
not resistant
Table 1. Chemical Resistance
Chemical
Module
O-Rings (Viton Material)
20°C (68°F)
60°C (140°F)
Acetone
+
/
+
Ethanol, 96%
+
+
+
Ethyl acetate
/
-
-
Ethyl ether
+
+
/
Ethylene glycol
+
+
+
Formic acid (diluted)
+
+
-
Amylic alcohol
+
+
+
Aniline dye
+
+
+
Petrol ether, K
P
100-140 C
/
-
+
Benzene
/
-
/
Succinic acid (diluted)
+
+
+
Beer
+
+
+
Bromic water, cold saturated
-
-
+
Butanol
+
/
+
Butyl
/
-
/
Butyl glycol
+
+
+
Calcium chloride sol. aqueous
+
+
+
Chlorobenzene
+
/
+
Chloroform
+
-
+
Chlorosulfonic acid
-
-
/
Chloric water (short time)
+
/
+
Cyclohexane
+
+
+
Cyclohexanol
+
/
+
Cyclohexanon
/
+
/
Diethanol amine
+
+
+
Dichloroethylene
/
+
/
Dichlorobenzene, cold saturated
/
N/A
/
Dimethyl amine
/
-
+
Ferric chloride (III), saturated
+
+
+
Vinegar
+
+
+
Acetic acid, 10%
+
/
+
Hydrofluoric acid, 10%
+
+
+
Formaldehyde, 30%, aqueous
+
+
+
