Rubber composition, method for preparing same, fuel hose and fuel feed circuit incorporating same

A tubular extrudate, wherein the tubular extrudate is formed from a crosslinkable composition, the crosslinkable composition being based on at least one fluoroelastomer (FKM) and comprising a filler and a micronised powder of at least one fluorinated thermoplastic polymer which are dispersed in said at least one fluoroelastomer,

• wherein the crosslinkable composition comprises said micronised powder according to a quantity greater than 40 phr (phr:
• parts by weight per 100 parts of elastomer(s)),
• wherein the filler comprises at least one inorganic filler having lamellas which has an aspect ratio greater than 30 and which is based on a phyllosilicate chosen from kaolinite and micas, or is based on a talc, said aspect ratio being defined as being the ratio of an average largest dimension over an average smallest dimension of the lamellas, said ratio being measured by a scanning electron microscopy technique,
• wherein the tubular extrudate is able to form after crosslinking an inner layer of a fuel hose for a motor vehicle,
• wherein said at least one fluoroelastomer is an FKM chosen from terpolymers of vinylidene fluoride (VDF)-hexafluoropropylene (HFP)-tetrafluoroethylene (TFE) with a fluorine mass rate greater than or equal to 70%, and
• wherein the crosslinkable composition comprises at least two of said fluoroelastomers (FKM), comprising a first FKM and a second FKM with respective Mooney viscosities ML(1+10) at 121° C., measured according to the standard ASTM D 1646, comprised between 17 and 21 and between 22 and 26.

A fuel hose for a motor vehicle with a combustion or hybrid engine, including a radially internal layer and at least one radially external layer, wherein the radially internal layer is formed from a crosslinked rubber composition which is the product of a chemical crosslinking by a peroxide or a bisphenol of a crosslinkable rubber composition, with the fuel hose further including, between the radially internal and external layers, at least one radially intermediate layer and a textile reinforcement,

• wherein the crosslinkable rubber composition is based on at least one fluoroelastomer (FKM) chosen from terpolymers of vinylidene fluoride (VDF)-hexafluoropropylene (HFP)-tetrafluoroethylene (TFE) with a fluorine mass rate greater than or equal to 70%, and comprises a filler and a micronised powder of at least one fluorinated thermoplastic polymer which are dispersed in said at least one fluoroelastomer,
• wherein the crosslinkable rubber composition comprises said micronised powder according to a quantity greater than 40 phr (phr:
• parts by weight per 100 parts of parts of elastomer(s)),
• wherein the filler comprises at least one inorganic filler having lamellas which has an aspect ratio greater than 30 and which is based on a phyllosilicate chosen from kaolinite and micas, or is based on a talc, said aspect ratio being defined as being the ratio of an average largest dimension over an average smallest dimension of the lamellas, said ratio being measured by a scanning electron microscopy technique, and
• wherein the crosslinkable rubber composition comprises at least two of said fluoroelastomers (FKM), comprising a first FKM and a second FKM with respective Mooney viscosities ML(1+10) at 121° C., measured according to the standard ASTM D 1646, comprised between 17 and 21 and between 22 and 26.