Abstract: A bladder for tire vulcanizing containing a crosslinked fluoroelastomer obtained by peroxide-crosslinking a fluoroelastomer composition including a peroxide-crosslinkable fluoroelastomer (A), a carbon black (B), and a peroxide cross-linking agent (C), wherein the crosslinked fluoroelastomer has a hardness at 25° C. of 60 to 90, a number of foreign particles selected from the group consisting of lumps of carbon and carbon grit having an aspect ratio of 1.1 or less and a Heywood diameter of 5 ?m or more present on a fracture surface obtained by tensile fracture of the crosslinked fluoroelastomer at 170° C. is 10/mm2 or less, and the fluoroelastomer (A) includes a vinylidene fluoride (VdF) fluoroelastomer.

Abstract: Provided is a tire vulcanizing bladder comprising fluororubber, wherein a plurality of grooves extending in a width direction are formed on a circumference of an outer surface of the tire vulcanizing bladder, and a plurality of recesses connecting the grooves to each other are formed between the grooves. Also provided is a pneumatic tire comprising one or more fluorine-containing particles having a maximum diameter of 1.0 ?m or more per area of 100 ?m2 of a tire inner surface, wherein a plurality of bladder ridges extending in a tire width direction are formed on a circumference of the tire inner surface, and a plurality of protrusions connecting the bladder ridges to each other are formed between the bladder ridges.

Abstract: A fluoroelastomer composition, and a crosslinked fluoroelastomer obtained by crosslinking the fluoroelastomer composition. The fluoroelastomer composition contains 10 to 60 parts by mass of a carbon black (B) and 0.1 to 10 parts by mass of a peroxide cross-linking agent (C) per 100 parts by mass of a peroxide-crosslinkable fluoroelastomer (A). The carbon black (B) has a number of foreign particles of 30/mm2 or less measured as described herein.

Abstract: An object of the present disclosure is to provide a tire production method which effectively inhibits the migration of sulfur to a vulcanizing bladder in a process of vulcanizing an unvulcanized tire provided at an inner surface thereof with a member having a high concentration of sulfur. Specifically, a tire production method includes a vulcanization process of vulcanizing an unvulcanized tire which is provided, in at least a portion of the innermost surface thereof, with a high sulfur concentration rubber member made of a rubber composition containing sulfur by ?1.0 parts by mass with respect to 100 parts by mass of a rubber component, wherein the vulcanization process employs a vulcanizing bladder made of a rubber composition for a bladder, which rubber composition contains fluororubber by 50 mass % to 100 mass %.