A rubber composition containing 100 parts by mass of a chloroprene polymer, more than 0 parts by mass and 25 parts by mass or less of a diene-based polymer having an epoxy group, and 0.2 to 2.5 parts by mass of at least one selected from the group consisting of a thiourea compound and a thiazolidinethione compound. A vulcanizate and a vulcanized molded article of the rubber composition.

A rubber composition containing 100 parts by mass of a chloroprene polymer, more than 0 parts by mass and 25 parts by mass or less of a diene-based polymer having an epoxy group, and 0.2 to 2.5 parts by mass of at least one selected from the group consisting of a thiourea compound and a thiazolidinethione compound. A vulcanizate and a vulcanized molded article of the rubber composition.

A power transmission V-belt includes a tension member, an adhesion rubber layer in which at least part of the tension member is embedded, and a tension rubber layer and a compression rubber layer stacked via the adhesion rubber layer. A rubber hardness of the tension rubber layer is smaller than a rubber hardness of the compression rubber layer. In the adhesion rubber layer, a rubber hardness on a tension rubber layer side relative to the tension member is smaller than a rubber hardness on a compression rubber layer side.

A power transmission V-belt includes a tension member, an adhesion rubber layer in which at least part of the tension member is embedded, and a tension rubber layer and a compression rubber layer stacked via the adhesion rubber layer. A rubber hardness of the tension rubber layer is smaller than a rubber hardness of the compression rubber layer. In the adhesion rubber layer, a rubber hardness on a tension rubber layer side relative to the tension member is smaller than a rubber hardness on a compression rubber layer side.

A power transmission V-belt includes a tension member, an adhesion rubber layer in which at least part of the tension member is embedded, and a tension rubber layer and a compression rubber layer stacked via the adhesion rubber layer. A rubber hardness of the tension rubber layer is smaller than a rubber hardness of the compression rubber layer. In the adhesion rubber layer, a rubber hardness on a tension rubber layer side relative to the tension member is smaller than a rubber hardness on a compression rubber layer side.

An improved Type C air conditioning hose is provided that meets or exceeds SAE J2064 and J3062 requirements, offers good flexibility and fracture resistance, and exhibits improved permeation ratings for refrigerants including R134a and R1234yf. The multilayer type C barrier air conditioning hose includes a novel inner elastomeric tube layer capable of direct bonding to plastic without an intervening adhesive.

An improved Type C air conditioning hose is provided that meets or exceeds SAE J2064 and J3062 requirements, offers good flexibility and fracture resistance, and exhibits improved permeation ratings for refrigerants including R134a and R1234yf. The multilayer type C barrier air conditioning hose includes a novel inner elastomeric tube layer capable of direct bonding to plastic without an intervening adhesive.

An air spring bellow formed from a rubber composition including a rubber component that contains a polyisoprene rubber and syndiotactic 1,2-polybutadiene. The syndiotactic 1,2-polybutadiene has a low crystallinity of 40 percent or less and the rubber composition includes a filler.

An air spring bellow formed from a rubber composition including a rubber component that contains a polyisoprene rubber and syndiotactic 1,2-polybutadiene. The syndiotactic 1,2-polybutadiene has a low crystallinity of 40 percent or less and the rubber composition includes a filler.

The present invention relates to a thermally expandable fire resistant material comprising at least one matrix resin selected from the group consisting of a thermoplastic resin and a rubber and a thermally expandable graphite, having an expansion pressure of 3.0 N/cm.sup.2 or more. According to the present invention, a fire resistant material capable of exhibiting excellent fire resistance can be provided.