| abstract |
100 phr as (per) fluoroelastomer; 0.5 to 50 phr of silica having a pH value higher than 7, preferably higher than 8, as measured by DIN ISO 787-9 standard; I) (wherein R 1 , R 2 , R 3 , R 4 , R 5 , R 6 are the same or different and are each H or C 1 -C 5 alkyl; Z optionally contains an oxygen atom) Preferably selected from C 1 -C 18 linear or branched alkylene or cycloalkylene groups, or (per) fluoropolyoxyalkylene groups, which are preferably at least partially fluorinated. (Per) fluoroelastomer composition which can be cured by the peroxide method, comprising 0.5 to 10 phr of a bis-olefin having [Selection figure] None |