This disclosure aims to provide a hose rubber composition capable of ensuring the flame retardance and simultaneously achieving both the tear resistance and the flexibility after vulcanization. The hose rubber composition of this disclosure comprises a rubber component and a carbon black, wherein: a chloroprene rubber is contained at an amount of 60 parts by mass or more in 100 parts by mass of the rubber component; the carbon black is compounded at an amount of more than 30 parts by mass and less than 80 parts by mass per 100 parts by mass of the rubber component; and the carbon black contains 13 mass % or more of a specific carbon black having an iodine adsorption of 100 to 160 mg/g and a DBP oil absorption of 70 to 180 mL/100 g.

A hose assembly includes a hose defining an internal fluid passage and an exterior surface, an end connection attached to a first end of the hose, an insulation material wrapped onto the exterior surface of the hose, a cover installed over the insulation material, and an elastomeric sleeve extending over and in compressive engagement with at least a portion of the end connection and the cover. The insulation material, the cover, and the elastomeric sleeve are each rated for continuous use at a temperature of at least about 135 C.

The subject invention discloses a low permeation curb pump hose comprising: (a) a tube layer, wherein the tube layer is comprised of a first nitrile rubber; (b) a barrier layer which is situated over the tube layer, wherein the barrier layer is comprised of a fluorothermoplastic; (c) a friction layer which is situated over the barrier layer, wherein the friction layer is comprised of a second nitrile rubber; (d) a reinforcement layer which is situated over the friction layer, wherein the reinforcement layer is comprised of braided steel wire, wherein the braided steel wire has a wire pack coverage of about 30 percent to about 60 percent; and (e) a cover layer which is situated over the reinforcing layer, wherein the cover layer is comprised of a chlorinated polyethylene.

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.

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.

Provided is a method of determining whether a multilayer tubular structure (MLT) satisfies an extractables test by filling the multilayer tubular structure MLT with an alcohol-containing petrol of FAM B type to obtain a filled MLT and measuring the amount of extractable material. The MLT satisfies the extractables test when the residue of the filtrate is less than or equal to 6 g/m.sup.2 of the inner surface area of the MLT.

A four-layer-structured water passing device is provided, in which a first sleeve and a second sleeve are disposed between an elastic inner tube and an outer cloth sheath. When the water passing device is connected with a pressurized water source, the first sleeve can quickly eliminate or reduce the impact wave strength when receiving a strong expansion impact from the elastic inner tube, such that the first sleeve can gently transmit the fluctuation to the second sleeve, and the second sleeve extends the outer cloth sheath to the limit length, so as to avoid damage caused by frequent direct contact friction between the elastic inner tube and the outer cloth sheath. The water passing device is also configured to avoid permanent deformation and abrasion at the joint position between the elastic inner tube and the outer cloth sheath, and thus prolong the service life of the water passing device.

A device for transporting a medium includes at least one channel which extends in an axial direction and through which the medium is guided. The channel is enclosed by an electrically conductive inner envelope that is connected to a first potential equalization conductor. An electrically conductive outer envelope is provided between the channel and an electrically conductive outer casing and is connected to an electrically conductive second potential equalization conductor. Arranged between the channel and the outer envelope is an electrically insulating intermediate layer which is produced from heat-insulating material.

A multilayer plastic tubing for motor vehicles includes a first layer of tubing and a second layer of tubing positioned about the first layer of tubing. The first layer is stiffer and thinner than the second layer.

An ultrahigh-pressure acid-fracturing isodiametric hose assembly, comprising a hose body and a metal joint. The metal joint comprises an inner tube, a first outer tube the inner tube, and a second outer tube. The first outer tube and the second outer tube each is an independent pressing part. An external groove is provided at an outer wall of the inner tube. An end of the first outer tube comprises an internal ridge which matches the external groove for snapping. The terminal of the inner tube comprises a connecting portion. An outer wall of the inner tube comprises a first protrusion, and an inner wall of the first outer tube comprises a second protrusion engaging with the first protrusion. The hose body is clamped between the first protrusion and the second protrusion that are engaged. An inner wall of the second outer tube comprises multiple micro-protrusions.