BRONKHORST EL-FLOW Select Series - Sealing material compatibility

Bronkhorst®
Instruction Manual EL-FLOW® Select 9.17.099F12
1.8 Sealing material compatibility
EL-FLOW® Select instruments are fitted from factory with internal seals compatible with the specified gas type. Before using
other media, always check their compatibility with the applied sealing materials. Check the corresponding indication in the
model key on the serial number label to see which sealing materials have been incorporated in your specific instrument.
When in doubt, do not hesitate to contact your Bronkhorst representative for more information.
The table below lists compatibility with some commonly used gases:
Gas
Sealing material
Viton®
EPDM
Kalrez®/FFKM
Air
ü
ü
ü
Ar (Argon)
ü
ü
ü
CH4 (Methane)
ü
û
ü
CO (Carbon monoxide)
ü
ü
ü
CO2 (Carbon dioxide)
max 10 bar(g), 50°C
ü
max 10 bar(g), 50°C
(ED compound
1
max 30 bar(g))
C2F6 (Freon-116)
ü
ü
ü
C2H2 (Acetylene)
ü/û
2
ü
ü
C2H4 (Ethylene)
max 10 bar(g)
3
max 10 bar(g)
max 10 bar(g)
C2H6 (Ethane)
ü
û
ü
C3H6 #2 (Propylene)
max 10 bar(g)
û
max 58 bar(g)
3
C3H8 (Propane)
ü
û
ü
Cl2 (Chlorine)
ü
û
ü
He (Helium)
ü
ü
ü
H2 (Hydrogen)
ü
ü
ü
H2S (Hydrogen sulfide)
û
ü
ü
Kr (Krypton)
ü
ü
ü
NF3 (Nitrogen trifluoride)
û
û
ü
NH3 (Ammonia)
û
ü
ü
NO (Nitric oxide)
û
û
ü
N2 (Nitrogen)
ü
ü
ü
N2O (Nitrous oxide)
max 20 bar(g), 50°C
ü
ü
O2 (Oxygen)
ü
ü
ü
SF6 (Sulfur hexafluoride)
û
ü
ü
SiH4 (Silane)
ü/û
2
û
ü
Xe (Xenon)
ü
ü
ü
1) ED: Explosive Decompression resistant
2) Only O-ring seals, not suitable for control valve plunger
3) For higher pressures ED compounds are used
· Do not use process gases/mixtures that are incompatible with the sealing materials the instrument is equipped with
· Do not exceed the indicated maximum operating pressure/temperature. Using the instrument outside the given
operating limits may lead to serious damage to the instrument
· The gas(es) used in the fluid system in which the instrument is mounted must be clean and dry