GEA ECOVENT - Resistance and Permitted Operating Temperature of the Sealing Materials

3.2.3 Resistance and permitted operating temperature of the
sealing materials
The r
esistance 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 dened 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 r
esistance
●
o = r
educed 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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