Technical Data
Resistance of Sealing Materials
56
Operating Instructions · VARIVENT
®
Mixproof Valve L with Lifting Actuator, suitable for pigging operation
Edition 26/08/2016
Resistance of Sealing Materials
The resistance of sealing materials depends 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.
Resistance:
•
+ = good resistance
•
o
= reduced service life
•
–
= not resistant
Table Resistance of Sealing Materials
Medium
Temperature
Sealing material (general operation temperature*)
EPDM
-40...+135°C
-40...+275°F
FKM
-10...+200 °C
+14...+392°F
HNBR
-25...+140 °C
-13...+284°F
Caustics up to 3%
up to 80 °C (< 176°F)
+
o
+
Caustics up to 5%
up to 40 °C (< 104°F)
+
o
o
Caustics up to 5%
up to 80 °C (< 176°F)
+
–
–
Caustics at 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 80 °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
–
+
+
* depending on the installation position
