| abstract |
Vulcanizable fluoroelastomer compositions comprising : A) a fluoroelastomer matrix based on vinylidene fluoride (VDF) with a Mooney viscosity (1+10) at 121°C of less than 35 MU (Mooney Units), preferably less than 25 MU and more preferably less than 20 MU, measured according to ASTM standard D 1646; B) a semi-crystalline fluoropolymer, in an amount of from 20 % to 70 % by weight relative to the total weight of A)+B), preferably from 25 % to 60 % by weight and more preferably from 35 % to 55 % by weight, the semi-crystalline fluoropolymer being constituted of tetrafluoroethylene (TFE) homopolymers and copolymers of TFE with one or more monomers containing at least one unsaturation of ethylenic type, in an amount of from 0.01 to 10 mol % and preferably from 0.05 to 7 mol %, said semi-crystalline fluoropolymer having a mean particle size between 10 and 400 nm, preferably between 40 and 300 nm and more preferably between 60 and 250 nm. |