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Fluoroelastomeric compositions comprising:A) a fluoroelastomeric matrix;B) a semi-crystalline fluoropolymer, in an amount from higher than 40% to 90% by weight based on the total of A)+B);the fluoroelastomer A) incorporates the fluoropolymer B), the fluoropolymer B) being formed by tetrafluoroethyle

Fluoroelastomeric compositions comprising:A) a fluoroelastomeric matrix;B) a semi-crystalline fluoropolymer, in an amount from higher than 40% to 90% by weight based on the total of A)+B);the fluoroelastomer A) incorporates the fluoropolymer B), the fluoropolymer B) being formed by tetrafluoroethylene (TFE) homopolymers, or by TFE by copolymers with one or more monomers containing at least one unsaturation of ethylene type, the average sizes of the semi-crystalline fluoropolymer particles being from 10 to 100 nm, preferably from 10 to 60 nm.

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1. Fluoroelastomeric compositions comprising:A) a perfluoroelastomeric matrix; B) a semi-crystalline fluoropolymer, in an amount from higher than 40% to 90% by weight based on the total of A)+B); the fluoroelastomer A) incorporates the fluoropolymer B), the fluoropolymer B) being formed by tetrafluo

1. Fluoroelastomeric compositions comprising:A) a perfluoroelastomeric matrix; B) a semi-crystalline fluoropolymer, in an amount from higher than 40% to 90% by weight based on the total of A)+B); the fluoroelastomer A) incorporates the fluoropolymer B), the fluoropolymer B) being formed by tetrafluoroethylene (TFE) homopolymers, or by TFE copolymers with one or more monomers containing at least one unsaturation of ethylene type, in an amount from 0.01 to 10% by moles, the average sizes of the semi-crystalline fluoropolymer particles being from 10 to 100 nm.2. Fluoroelastomeric compositions according to claim 1, wherein the semi-crystalline fluoropolymer B) amount incorporated, in the fluoroelastomeric matrix is higher than 40% by weight, based on the total of the polymer mixture.3. Compositions according to claim 1, wherein the semi-crystalline fluoropolymer B) comprises comonomers having an ethylene unsaturation both of hydrogenated and fluorinated type.4. Compositions according to claim 3, wherein the fluorinated comonomers are selected from the following:C3-C8 perfluoroolefins; C2-C8 hydrogenated fluoroolefins; C2-C8 chloro-fluorolefins (per)fluoroalkylvinylethers (PAVE) CF2?CFORf, wherein Rf is a C1-C6 (per)fluoroalkyl; (per)fluoro-oxyalkylvinylethers CF2?CFOX, wherein X is: C1-C12 alkyl, or C1-C12 oxyalkyl, or C1-C12 (per)fluoro-oxyalkyl having one or more ether groups; fluorovinylethers (MOVE) of general formula CFXAI?CXAIOCF2ORAI (A-I) wherein RAI is a C2-C6 linear, branched, or C5-C6 cyclic (per)fluoroalkyl group, or a C2-C6 linear, branched (per)fluorooxyalkyl group containing from one to three oxygen atoms; when RAI is a fluoroalkyl or a fluorooxyalkyl group as above defined it can contain from 1 to 2 atoms, equal or different, selected from the following: H, Cl, Br, I; XAI?F, H. 5. Compositions according to claim 4, wherein the comonomers are selected among PAVES, MOVEs, and fluorodioxoles.6. Compositions according to claim 1, wherein the fluoroelastomers A) are VDF- or TFE-based copolymers and are selected from the following:(1) VDF-based copolymers, wherein VDF is copolymerized with at least one comonomer selected from the following: C2-C8 perfluroolefins; C2-C8 chloro- and/or bromo- and/or iodo-fluoroolefins; (per)fluoroalkylvinylethers (PAVE) CF2?CFORf, wherein Rf is a C1-C6 (per)fluoroalkyl; perfluoro-oxyalkylvinylethers CF3?CFOX, wherein X is a C1-C12 perfluorooxyalkyl, having one or more ether groups; fluorovinylethers (MOVE) of general formula CFXAI?CXAIOCF2ORAI (A-I) wherein RAI is a C2-C6 linear, branched or C5-C6 cyclic (per)fluoro-alkyl group, or a C2-C6 linear, branched (per)fluorooxyalkyl group containing from one to three oxygen atoms; when RAI is a fluoroalkyl or a fluorooxyalkyl group as above it can contain from 1 to 2 atoms, equal or different, selected from the following: H, Cl, Br, I; XAI?F, H; C2-C8 non fluorinated olefins (Ol); (2) TFE-based copolymers, wherein TFE is copolymerized with at least one comonomer selected from the following: (per)fluoroalkylvinylethers (PAVE) CF2?CFORf, wherein Rf is as above; perfluoro-oxyalkylvinylethers CF2?CFOX, wherein X is as above; fluorovinylethers (MOVE) of formula CFXAI?CXAIOCF2ORAI (A-I) wherein RAI and XAI are as above; C2-C8 fluoroolefins containing hydrogen and/or chlorine and/or bromine and/or iodine atoms; C2-C8 non fluorinated olefins (Ol); perfluorovinylethers containing hydrocyanic groups. 7. Fluoroelastomeric compositions according to claim 6, wherein the monomer compositions, expressed as % by moles, which form the basic structure of the fluoroelastomer, are the following, being 100% the sum of the molar percentages of the monomers:(a) vinylidene fluoride (VDF) 45-85%, hexafluoropropene (HFP) 15-45%, tetrafluorethylene (TFE) 0-30%; C2-C8 non fluorinated olefins (Ol) 0-30%; (b) vinylidene fluoride (VDF) 45-85%, perfluoroalkyl vinyl ether (PAVE) and/or fluorovinyl-ethers (MOVE) 15-55%, tetrafluoroethylene (TFE) 0-30%; (c) vinylidene fluoride (VDF) 15-40%, C2-C8 non fluorinated olefins (Ol) 5-30%, hexafluoropropene (HFP) and/or perfluoroalkylvinylether (PAVE) 15-30%, tetrafluoroethylene (TFE) 1-30%; (d) vinylidene fluoride (VDF) 5-30%, perfluoroalkylvinylether (PAVE) and/or fluorovinylethers (MOVE) 15-55%, tetrafluoroethylene (TFE) 33-75%; (e) tetrafluoroethylene (TFE) 50-80%, perfluoroalkylvinylether (PAVE) and/or fluorovinylethers (MOVE) 15-55%; (f) tetrafluoroethylene (TFE) 45-65%, C2-C8 non fluorinated olefins (Ol) 20-55%, vinylidene fluoride 0-30%; (g) tetrafluoroethylene (TFE) 32-60% by moles, C2-C8 non fluorinated olefins (Ol) 10-40%, perfluoroatkylvinylether (PAVE) 20-40%. 8. Compositions according to claim 1, wherein the fluoroelastomeric matrix comprises monomeric units deriving from a bis-olefin having general formula: whereinR1, R2, R3, R4, R5, R6, equal to or different from each other, are H or C1-C5 alkyls; Z is a C1-C18 linear or branched alkylene or cycloalkylene radical, optionally containing oxygen atoms, or a (per)fluoropolyoxyalkylene radical, the amount of the units in the polymer chain deriving from said bis-olefins being in the range 0.01-1.0% by moles, per 100 moles based on the total of the other monomeric units. 9. Fluoroelastomeric compositions according to claim 1, obtained by mixing the latex of the semi-crystalline fluoropolymer B) with the latex of the fluoroelastomer A) and subsequent coagulation.10. Fluoroelastomeric compositions according to claim 1, obtained in the same reactor, by using two subsequent steps: in the first step the semi-crystalline fluoro-polymer B) is polymerized, while in the second step the fluoro-elastomer A) is polymerized.11. Compositions according to claim 1, cured by peroxidic or by ionic route or by combination of the two techniques.12. Compositions according to claim 4, wherein the fluorinated comonomers are selected from the following:hexafluaropropene (HFP) or hexafluoroisobutene; vinyl fluoride (VF), vinylidene fluoride (VDF), trifluoroethylene or perfluoroalkylethylene CH2?CH?Rf, wherein Rf is a C1-C6 perfluoroalkyl; chlorotrifluoroethylene (CTFE); (per)fluoroalkylvinylethers (PAVE) CF2?CFORf, wherein Rf is CF3, C2F5, C3F7; (per)fluoro-oxyalkylvinylethers CF2?CFOX, wherein X is: C1-C12 alkyl, C1-C12 alkyl, C1-C12 oxyalkyl, C1-C12 (per)fluoro-oxyalkyl having one or more perfluoro-2-propoxy-propyl groups or perfluoxodioxoles; fluorovinylethers (MOVE) of general formula CFXAI?CXAI?OCF2OCF2CF2YAI??(A-II) wherein YAI is F or OCF3, XAI as above defined; or (MOVE I) CF2?CFOCF2OCF2CF3 (A-III) and (MOVE II) CF2?CFOCF2OCF2CF2OCF3 (A-IV).13. Compositions according to claim 5, wherein the comonomers are selected from the group consisting of perfluoromethyl-, ethyl-, propyl-vinylether, MOVE I and MOVE II, and perfluoro-dioxoles.14. Compositions according to claim 6, wherein the VDF-based copolymers comprise at least one comonomer selected from the group consisting of tetrafluoroethylene (TFE); hexafluoropropene (HFP); chlorotrifluoroethylene (CTFE); bromotrifluoroethylene; (per)fluoroalkylvinylethers (PAVE) CF2?CFOX, wherein Rf is trifluoromethyl, bromodifluoromethyl or pentafluoropropyl, perfluoro-oxyalkylvinylethers CF2?CFOX, wherein X is a perfluoro-2-propoxy-propyl group; fluorovinylethers (MOVE) of formula CFXAI?CXAIOCF2ORAI (A-I)wherein RAI is as above defined, XAI is F or H, or of formula: XAI is F or H, or of formula CFXAI?CXAIOCF2OCF2CF2YAI (A-II) wherein YAI?F, OCF3; XAI, as above defined, or (MOVE I) CF2?CFOCF2OCF2CF3 (A-III) and (MOVE II) CF2?CFOCF2OCF2CF2OCF3 (A-IV). 15. Compositions according to claim 8, wherein the fluoroelastomeric matrix comprises the monomeric units deriving from a bis-olefin of formula (II) wherein Z is a partially fluorinated C1-C18 linear or branched alkylene or cycloalkylene radical, optionally containing oxygen atoms, or a (per)fluoropolyoxyalkylene radical.16. Sealing manufactured articles obtained by the compositions according to claims 1-11.17. Sealing manufactured articles according to claim 16, wherein said articles are gaskets, pipes, fittings, shaft seals and oil seal rings.18. Sealing manufactured articles according to claims 16-17 for oil industry.