Fluorine-containing elastomer blend

A polyol-vulcanizable, fluorine-containing elastomer blend comprising:

• 5 to 60 wt. % of a high-molecular-weight, fluorine-containing elastomer having a number average molecular weight of 3,000,000 or more;
• 20 to 80 wt. % of a medium-molecular-weight, fluorine-containing elastomer having a number average molecular weight of 100,000 to 1,000,000;
• and
• 10 to 50 wt. % of a low-molecular-weight, fluorine-containing elastomer having a number average molecular weight of 7,000 to 13,000;
• the number average molecular weight Mn of each fluorine-containing elastomer being measured by liquid chromatography using tetrahydrofuran as a developing solvent at a polymer concentration of 0.5 wt. % at a measurement temperature of 35° C.,
• wherein the low-molecular-weight fluorine-containing elastomer contains iodine as a crosslinking group and the high-molecular-weight fluorine-containing elastomer and the medium-molecular-weight fluorine-containing elastomer contain no iodine as a crosslinking group.