Guizhou Yasu Tube Industry Co.,Ltd

Guizhou Yasu Tube Industry Co.,Ltd is one of the leading hdpe silicore duct manufacturers and suppliers in China, welcome to buy and wholesale cheap, fashion and customized jetnet tube made in China from our factory.

HDPE silicore duct, a kind of protection tube for communication cables, is produced by synchronously extruding an unique silicon core raw material with low coefficient of friction into the inside of HDPE duct. It provides the convenience of cable laying and permanent solid lubrication channels with low coefficient of friction, presently regarded as the world's most advanced protection tube of optical cables. Its advanced nature lies in using cable blowing machine to blow cables with high pressure air into pre-embedded HDPE tube line of low friction instead of manual operation of cable traction adapted by other communications tube line. Cables in the tube line are in a suspended state and laid forward in a high speed, making cables free from the damage caused by stretching. The blown cables can reach more than 1000 meters at a time, solving the problem of signal attenuation caused by the destruction of mechanical traction and overmuch joints formed by limited traction length, which can greatly reduce the number of manual well excavations and construction costs. Silicore duct has the advantages of high mechanical strength, excellent high and low temperature resistance, chemical corrosion resistance, long service life, good flexibility and can adapt to the change of slope and bending of all kinds of terrains.

Product Specification Data:

Scope of Application Range

It can be applied to the tube line system of outdoor communication optical fiber, optical and electric cable as well as power supplies line. Besides, it is suitable to subsidiary conduit, special tube line, long-distance communication channel, and protective wire within buildings or wiring duct of cables.

Performance Feature

The silicon core layer of inner surface is solid, permanent lubricant; it is synchronously extruded into the wall of HDPE tube line and evenly distributed throughout the tube wall. It will not peel off and has the same service life with silicon tube and same physical and mechanical properties with HDPE. Its friction characteristics remain unchanged so that cables can be repeatedly extracted in the tube line. Without reacting with water, its tube line can be washed by water after an accident.

Technical Indexes

Number Items Technical Indexes

Appearance Quality ---uniform appearance color; flat, uniform and smooth inside and outside wall entities without defects of collapse, dimple, holes, tear, impurities and so on; sections without bubble and crack; closely sintered inner wall without dropping off; a complete and clear product identification on outer wall;

Hardness of outer wall is not less than 59(D-Shore Hardness Type);

Friction coefficient of inner wall in static state is not more than 0.25 (plate method, standard test bar for HDPE);

In dynamic state, not more than 0.15;

Radius of cold bending (mm), 400;

Ring stiffness (KN/m2), not less than 50;

Flattening test-- Unload immediately until deformation of outer diameter up to 50% of the original under vertical compression, and the sample will not become broken or hierarchical;

Recovery rate (%)--- Unload immediately until deformation of outer diameter up to 50% of the original under vertical compression, and the sample will not become broken or hierarchical; 10 min outer diameter can naturally restore to over 85% of the original; 

Impact resistance to drop hammer at normal temperature-- At room temperature of 23 ℃ and height of 2 m, with 15.3 kg heavy hammer impacting 10 samples, more than nine samples should have no cracking phenomenon;

Low temperature  At temperature of -20 ℃, height of 2 m, with 15.3 kg heavy hammer impacting 10 samples, more than nine samples should have no cracking phenomenon;

Resistance to water pressure and sealing property --Under the condition of 20 ℃, 50 KPa pressure, it can maintain 24 hours without leakage;

Cracking resistance (MPa), not less than 2.0;

Connection force of tube joints (N), not less than 6700;

Longitudinal shrinkage ratio (%), not more than 3.0;

Curing temperature （℃）-75;

Environment stress cracking resistance, 48h; Invalid number not more than 20%;

MFR (melt flow rate) （g/10min）MFR(190/2.16) not more than 0.5;

Heat stress cracking resistance, 168 hours; invalid number not more than 20%;

Power frequency breakdown strength（MV/m）, not less than 24;

Resistance to chemical medium corrosion-- Put tube samples into the solution of 5% of NaCL, 40% of H2SO4, and 40% NaOH respectively for 24 hours without obvious corrosion phenomenon;

Hydrocarbon Resistance-- External force of 528 N exerted on silicore duct after soaking it with heptanes for 72 hours, the sample is not damaged and the permanent deformation is not over 5%;

Product Specification and Application Range

Specification Table of Silicore Duct

Wall Thickness-- The minimum thickness of Silicon tube is 2 mm, the maximum is 6 mm. With special requirements to wall thickness, it can also be produced. The most common thickness is 3.0 mm, 3.5 mm and 4.0 mm. 

Length-- 1000m of endless knot in factory standard for 50/42 silicon tubes, 1000m endless knots for 40/33-silicon tube, and 1500m for 32/26 silicon tube. With special needs of customers, products can leave the factory with longer or arbitrary length under the condition of convenient transportation and operation.

Color-- Any kind of pure color can be chosen or a silicon tube of pure color can be inlaid with vertical stripes of other colors.

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