Fluororubber seals can be used for bromine compatibility
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We want to use fluororubber O-rings for planar sealing, with bromine as the medium. We’re not sure if there will be corrosion; the service life of the pump depends on the effectiveness of this seal. We don’t want to use PTFE seals or fluorinated O-rings, as they are too hard. Bromine has a strong ability to penetrate materials. Those with experience, please let us know. Thank you!!!
EPDM sealing rings are a bit softer; they might offer better performance, so it’s worth giving them a try.
EPDM is incompatible with bromine; it will corrode rapidly and will not provide any sealing function. Another option available today is perfluoroelastomer, which is definitely compatible and also belongs to the category of rubber elastomers – only its price is high! ! I checked the relevant manuals for fluororubber; fluororubber (VITON) is compatible with bromine. Fluororubber diaphragms are used in diaphragm pumps; during the pumping of bromine, the diaphragms were immersed in bromine for 16 days, and they ruptured. We are a bit concerned about whether fluororubber is corroded by bromine Although the diaphragm is broken, the fluororubber remains soft and has not hardened; it is slightly bulged in some areas and its color has changed in certain spots, indicating that corrosion has occurred. Using a fluororubber O-ring might help improve the situation. The width of the sealing surface is currently 3.5 millimeters; it remains to be seen how long this will hold As long as bromine does not penetrate this seal, the pump will be fine.
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Perfluoroethers have a high fluorine content, so they should be able to withstand it. For now, use fluororubber (VITON); check its compatibility with bromine, and see how it performs. If that doesn’t work, then use perfluoroethers
In practice, fluororubber FKM can withstand bromine
LZ, what material is used for your bromine pipelines? Bromine has too high a permeability. .
The customer’s pipeline wasn’t given proper attention; it is said to be PVDF
PVDF is used for pipes; PTFE cannot be used