| abstract |
The tubes of the present invention contain the following layers, in the radial direction from inside to outside;n n n A layer (1) formed of a polyamide P 1 / polyolefin PO 1 mixture with a polyamide P 1 matrix or formed of polyamide P 1 ,n n n -Layer (2) formed of copolyamide,n n n A layer (3) formed of polyamide P 3 ,n n n (P 1 and P 3 may be the same or different, and layers (1), (2) and (3) are continuous and are attached to each other at their respective contact sites).n n n Additional layers made of EVOH or containing electrically conductive carbon black can be added to these three layers (1, 2 and 3). |