3.2.3 Resistance and permitted operating temperature of the
sealing materials
The resistance and permitted operating temperature of the sealing materials depend on
the type and temperature of the medium conveyed. The exposure time can adversely
affect the service life of the seals. The sealing materials comply with the regulations of
FDA 21 CFR 177.2600 or FDA 21 CFR 177.1550.
The maximum operating temperature is defined by the sealing type and its mechanical
load.
Due to the versatile conditions of use (e.g. usage duration, switching frequency, type
and temperature of product and cleaning agents as well as usage environment), GEA
Tuchenhagen recommends that the user carries out resistance tests.
Resistance:
●
+ = good resistance
●
o = reduced resistance
●
– = no resistance
Medium
Maximum operating temper-
atures
EPDM
FKM
HNBR
Alkalis up to 3%
up to 80 °C (176°F)
+
o
+
Alkalis up to 5%
up to 40 °C (104°F)
+
o
o
Alkalis more than 5%
up to 80 °C (176°F)
+
–
-
Alkalis more than 5%
o
–
-
Inorganic acids up to 3%
up to 80 °C (176°F)
+
+
+
Inorganic acids up to 5%
up to 80 °C (176°F)
o
+
o
Inorganic acids up to 5%
up to 100 °C (212°F)
–
+
-
Water
up to 100 °C (176°F)
+
+
+
Steam
up to 135 °C (275°F)
+
o
o
Steam, approx. 30 min
up to 150 °C (302°F)
+
o
-
Fuels/hydrocarbons
-
+
+
Product with a fat content of max. 35%
+
+
+
Product with a fat content of more than 35%
-
+
+
Oils
-
+
+
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