Provided is a multilayer tube that has a layer containing an aliphatic polyamide (such as Polyamide 11 or Polyamide 12), a layer containing a Polyamide 6 composition or Polyamide 6/66/12 composition, a layer containing a saponified ethylene-vinyl acetate copolymer, and a layer containing a semi-aromatic polyamide composition that contains a semi-aromatic polyamide having a specific structure, and further has a fluorine-containing polymer in which a functional group having reactivity with an amino group is introduced into the molecular chain thereof.

The present disclosure comprises a multi-layer tube including an inner layer comprising a thermoplastic material, an intermediate layer comprising high density polyethylene (HDPE); and an outer layer comprising a thermoplastic material. The HDPE intermediate layer is sandwiched between the outer layer and the inner layer of a thermoplastic material. The thermoplastic material is selected to facilitate extrusion and provide a low cost, robust multi-layer tube for any low temperature glycol cooling system applications.

A fluid transport tube and method for forming including either of a monolayer or multiple layers and having a polymer or copolymer which is formed into a circular cross sectional profile and with a Graphene material included in the layer. The Graphene material further includes any graphene derivative not limited to single layer Graphene, few layered Graphene, Graphene oxide and reduced Graphene oxide. Versions of the tube can further include inner and outer layers, between which at least one barrier layer is provided. Any of a polyamide 12 (PA 12) or polyamide 612 (PA 612) can be incorporated into the layer for increased environmental barrier resistance.

A multilayer tubular structure (MLT) for transport of alcohol-containing petrol. The MLT from the outside inwards has at least one barrier layer and at least one inner layer located below the barrier layer. The inner layer, or all the layers contain on average at most 1.5% of plasticizer relative to the total weight of the composition of each layer or to the total weight of all the compositions of the layers. The inner layer is predominantly made of at least one polyamide having more than 75% aliphatic units. The aliphatic polyamide has a mean number of carbon atoms per nitrogen atom selected from the following: A: from 4 to 8.5; B: from 7 to 10; C: from 9 to 18; with the proviso that when the inner layer comprises at least three polyamides, at least one of the polyamides A, B and C is excluded.

A tubing to supply diesel exhaust fluid to an exhaust system of a diesel engine includes an inner layer made of a first material and an outer layer made of a second material. The first material includes polyethersulfone polymer or polyphenylene sulfide. The second material includes a polyamide or polyphthalamide. An outer surface of the inner layer and an inner surface of the outer layer include a reactive material that facilitates bonding between the inner layer and the outer layer of the tubing.

The present invention relates to a multilayer tubular structure (MLT) intended for the transport of fluids, in particular of petrol, especially alcohol-containing petrol, comprising, from the outside inwards, at least one barrier layer (1) and at least one inner layer (2) located below the barrier layer,

said inner layer (2), or all the layers (2) and the other optional layers located below the barrier layer, containing on average from 0 to 1.5% by weight of plasticizer relative to the total weight of the composition of the layer (2) or to the total weight of all the compositions of the layers (2) and the other optional layers located below the barrier layer, respectively,
said inner layer (2) predominantly comprising at least one polyamide of aliphatic type or consisting of more than 75% of aliphatic units, said aliphatic polyamide being chosen from: a polyamide denoted A, having a mean number of carbon atoms per nitrogen atom, denoted C.sub.A, of from 4 to 8.5, advantageously from 4 to 7; a polyamide denoted B, having a mean number of carbon atoms per nitrogen atom, denoted C.sub.B, of from 7 to 10, advantageously from 7.5 to 9.5; a polyamide denoted C, having a mean number of carbon atoms per nitrogen atom, denoted C.sub.C, of from 9 to 18, advantageously from 10 to 18;
with the proviso that when said inner layer (2) comprises at least three polyamides, at least one of said polyamides A, B and C is excluded.

A tubing to supply diesel exhaust fluid to an exhaust system of a diesel engine includes an inner layer made of a first material and an outer layer made of a second material. The first material includes polyethersulfone polymer or polyphenylene sulfide. The second material includes a polyamide or polyphthalamide. An outer surface of the inner layer and an inner surface of the outer layer include a reactive material that facilitates bonding between the inner layer and the outer layer of the tubing.

The disclosure relates to a fluid line having a pipe which includes at least two plastic layers. A first plastic layer includes hydrolysis-resistant polyamide 6 (PA6). The disclosure provides a fluid line which may be cost-effective.

The disclosure introduces a multi-layer automotive tube, said layers comprising an inner layer made of thermoplastic polyurethane (TPU); a first intermediate layer made of ethylene vinyl alcohol (EVOH); a second intermediate layer made of polyamide and an outer layer made of polyamide. The inner layer made of TPU provides excellent chemical stability and is significantly less susceptible to degradation caused by frequent contact with fuels and/or fuel vapors. Said automotive tube can be produced using methods widely known in the prior art, such that industrial lines for producing said automotive tube can be adapted without great difficulty.

A hose is provided comprising a rubber backing layer directly bonded to a continuous polyamide layer without an intervening adhesive layer, wherein the hose exhibits increased low and high temperature capability and decreased permeation compared to standard automotive refrigerant hoses.