Tube

Abstract: This tube has an even thickness and the load thereon is not concentrated on one point during use. The tube is highly durable, and the discharge performance thereof is stable even when the tube is used for a peristaltic pump or the like. The tube has a long shape constant in the longitudinal direction and has: a flow passage 12 penetrating the inside of the tube in the longitudinal direction; and a resin part 13 surrounding the flow passage 12. The resin part 13 is formed from a laminated body in which multiple expanded polytetrafluoroethylene layers 16 laminated in the radial direction of the flow passage 12 and elastomer layers 18 bonding the polytetrafluoroethylene layers 16 are alternatively laminated. The elastomer layer 18 is formed from at least one kind of elastomer, and a gap of the polytetrafluoroethylene layers 16 is impregnated with part of the elastomer. The average value of the thicknesses of the resin part 13 in at least four directions intersecting one another in the radial direction of the flow passage 12, the thickness ratio calculated from thicknesses in directions opposing each other among the thicknesses in the four directions, and the lamination number of the polytetrafluoroethylene layers 16 and the elastomer layers 18 satisfy predetermined conditions.

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