Patent ID: 7705083

Claim:
Ionically curable fluoroelastomers based on vinylidenefluoride (VDF) comprising: a) 100 parts by weight of fluoroelastomer based on vinylidenefluoride (VDF) substantially polar end groups free, wherein the amount of polar end groups is lower than the detectability limit of the determination method based on FT-IR, 1 H-NMR (300 MHz) and 19 F-NMR (188 MHz) analysis, wherein said detectability limit is 0.1 mmol/kg; b) from 0.1 to 0.15 phr of accelerating agent; c) from 1 to 15 phr of curing agent; d) from 2 to 20 phr of one or more inorganic acid acceptors; e) from 0 to 3 phr of one or more basic compounds; f) from 0 to 80 phr of reinforcing fillers; and g) from 0 to 3 phr of coadjuvants of processability, wherein when the ionically curable fluoroelastomers are used in O-rings, the ionically curable fluoroelastomers have compression set values lower than 20% after crosslinking in press at 190° C.-200° C. for 5-10 minutes and compression set values lower than 12% with post-treatment times at 250° C. lower than 30 minutes.