To provide a tube having an inner layer which comes into contact with a circulating fluid, a binder layer of an optional component and a vulcanized elastomer in the radial direction from the inside outwards.

The inner layer comprises (i) a fluoropolymer, (ii) an electrically conductive compound to be added optionally and (iii) a triblock copolymer ABC, the blocks A, B and C being linked together in that order. In addition, each of the blocks is a homopolymer or a copolymer obtained from two or more kinds of monomers, and the block A is linked to the block B and the block B to the block C by means of a covalent bond or an intermediate molecule respectively. This intermediate molecule is linked to one of the blocks by means of a covalent bond and to the other block by means of another covalent bond. The block A is compatible with the fluoropolymer; the block B is incompatible with the fluoropolymer and the block A; and the block C is incompatible with the fluoropolymer, the block A and the block B.