| abstract |
(57) [Summary] [Problem] A multilayer pipe for gasoline transport based on polyamide and EVOH. It has low gas permeability to gasoline, especially hydrocarbons, especially alcohols or ethers and additives, and has excellent durability to engine lubricating oils and fuels. SOLUTION: The multilayer tube has the following layers 1 to 5 in this order in a radial direction from the outside to the inside, and adjacent layers are bonded to each other: 1. outer layer made of polyamide; 2. a layer made of copolyamide; 3. layer composed of EVOH; 4. a layer made of copolyamide; Inner layer made of polyamide. Inner layer has surface resistivity It contains carbon black in an amount sufficient to bring it to 10 6 l / cm 2 or less. Gasoline pipe has 6-12mm outer diameter and 0.36mm-1.95 mm thickness, and also has the following dimensions: polyamide outer layer thickness: 50-700 μm, copolyamide layer thickness: 10 to 150 μm, thickness of EVOH layer: 10 to 200 μm, thickness of polyamide inner layer filled with conductive carbon black: 1 00-500 μm. |