Materials for membranes in FDA material
Materials for membranes in FDA material
(OP)
We are often asked to improve on the diaphrammaterials used in for example Alfa Laval Saunders diaphramvalves.
Have anyone got experience in replacing the EPDM rubbers with other materials.
The problem is that the EPDM cracks/hardens - and they have to replace the diaphrams every 10 - 12 weeks in the whole system.
PTFE covering the EPDM does not help.
Anyone having improved solutions to the problem ?
Have anyone got experience in replacing the EPDM rubbers with other materials.
The problem is that the EPDM cracks/hardens - and they have to replace the diaphrams every 10 - 12 weeks in the whole system.
PTFE covering the EPDM does not help.
Anyone having improved solutions to the problem ?





RE: Materials for membranes in FDA material
RE: Materials for membranes in FDA material
The medias themselves are more a matter of chemical attack -for example does epdm not do well in milk with fat content.
The problem is more the sterilisation process with live steam at 145 degrees C - 3 Bar - maybe 2 or 3 times a day up to an hour each time.
the maximum temperature is the 145 degrees C, the operating temperature from 5 to 60 degrees C.
RE: Materials for membranes in FDA material
RE: Materials for membranes in FDA material
For silicone contact GE or Shin Etsu and for Viton, Dupont.
Both suppliers provide a full technical service.
Regards
Peter Goodwin
RE: Materials for membranes in FDA material
RE: Materials for membranes in FDA material
some comments.
Silicone is not best choice for equipment which is in contact with hot steam, even if there are special "steam-resistant" types. SHIN-ETSU and UNIROYAL have EPDM/Silicone-"Copolymers" worth trying.
Another recommendation: try surface fluorination of your EPDM parts. You will find this as a service.
If all this does not help - as we saw in case of hot tomatoe ketchup- only fluoro rubber (there are some more than VITON
Hope to help
Berti