Multilayer structure based on recycled polyamide

A multilayer tubular structure for transporting fluids for a motor vehicle, the structure comprising at least three layers:

• at least one layer (1) consisting of a composition comprising at least 50% by weight of at least one semi-crystalline aliphatic polyamide, said composition consisting of at least 50% of recycled material from a single layer and/or multilayer tube that initially transported fluids for a motor vehicle, wherein a sum of constituents of the composition is equal to 100%, said tube consisting of a composition that comprises at least 50% by weight of at least one polyamide,
• at least one layer (2) consisting of a composition comprising at least 50% by weight of at least one semi-crystalline aliphatic polyamide and optionally at least one impact modifier,
• and when the layer (2) consists of a composition comprising at least 50% by weight of at least one semi-crystalline aliphatic polyamide that is PA12 and/or PA612 and/or PA1010, then said composition comprises said impact modifier, and
• at least one barrier layer,
• said layer (2) and the barrier layer each consisting of at least 90% of non-recycled material.