Thixotropic fluorinated curable compositions and articles sealed therewith

A thixotropic fluorinated curable composition comprising

• (A) a linear polyfluoro compound of the general formula (1):
• CH2═CH—(X)a—Rf1—(X′)a—CH═CH2 (1)
• wherein X is —CH2—, —CH2O—, —CH2OCH2— or —Y—NR1—CO—, Y is —CH2— or a group of the following structural formula (Z):
• 20
• X′ is —CH2—, —OCH2—, —CH2OCH2— or —CO—NR1—Y′—, Y′ is —CH2— or a group of the following structural formula (Z′):
• 21
• R1 is hydrogen, methyl, phenyl or allyl, Rf1 is a divalent perfluoropolyether group, and “a” is independently 0 or 1,
• (B) an organohydrogensiloxane having at least two hydrogen atoms each attached to a silicon atom in a molecule,
• (C) an effective amount of a platinum group metal catalyst, and
• (D) finely divided silica hydrophobized with a polysiloxane and having a specific surface area of at least 50 m2/g.