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Time:2016-04-21
Silicon Core Pipe
Silicon Core Pipe
Silicon Core Pipe is a new type complex pipe whose inner wall is with silicone solid lubricant. It has good sealing property and chemical corrosion. Because of lower engineering cost, it can be widely used to optical cable communication network systems of high speed road, railway and etc. HDPE Silicon Core Pipe, called silicon pipe for short is a new type complex pipe whose inner wall is with silicone solid lubricant. It is made by synchronous squeezing via three plastic extruders. Its main material is HDPE and core is silicone solid lubricant with the mini. friction coefficient. This project is widely used in optical cable communication network systems.
Characteristics of Performance
Its silicon layer of inner wall is solid with permanent lubricant.
Its silicon layer of inner wall is squezzed into high density PVC wall synchronously and uniformly spreat through out the whole pipe which won’t be separated and has the same service life as silicon pipe.
The silicon core of its inner wall shall have the same physical and mechanical properties as HDPE
Friction properties of its inner wall reamin unchaged and cables can be withdrawn repeatedly within the pipe.
The silicon core of its inner wall won’t react with water. If accidents occur, pipes can be washed by water.
Technical Indexes
Appearance Quality: being uniform in color; inner and outer walls to be leveling, even and smooth without collapse, pits, holes, tearing and impurities; what is more, there is no bulbs and cracking on sections. The inner wall is fused closely. No disengagement appears. Marks on outer wall shall be complete and clear.
Hardness of External Wall ≥59 (SHORE D Type)
Friction Coefficient of Inner Wall Static State: ≤0.25 (Plate Method, HDPE Standard Test Bar)
Dynamic State: ≤0.15
Cold Bending Radius(mm) 400
Ring Stiffness(KN/m2) ≥50
Flat Test: When add pressure vertically until external diameter is deformed to 50% of original external diameter, unload immediately and the sample appears no cracking and no disengagement.
Recovery Rate(%): When adding pressure vertically until external diameter is deformed to 50% of original external diameter, unload immediately and the sample appears no cracking and no disengagement. Ten minutes later, the external diameter will be restored to 85% of the original and even above.
Impact Resistance by Heavy Hammer: under 23℃ and from a height of 2m, at least nine of the ten samples appear no cracking when struck by a 15.3 kg hammer.
Low Temperature: Under -20℃ and a height of 2m, when struck by a 15.3 kg hammer, at least nine of the ten samples appear no cracking.
Water Pressure Resistance and Sealing Performance: under 20℃ and 50KPa, no leakage exists after 24h of test.
Cracking Resistance(MPa) ≥2.0
Connection Force at Joints(N) ≥6700
Longitudinal Shrinkage(%) ≤3.0
Curing Temperature(℃) -75
Environmental Stress Crack Resistance (ESCR):48h;failure rate ≤20%
Thermal Stress-Cracking Resistance:168h;failure rate ≤20%
Power-Frequency Breakdown Strength(MV/m) ≥24
Chemical Medium Resistance: no corrosions occur when samples are separately soaked in 5% NaCL, 40% H2SO4 and 40% NaOH for 24h.
Hydrocarbon Compounds Resistance: silicon-cored pipe samples are not damaged with permanent deformation below 5% after being soaked in heptane for 72h and beaten by 528N.
Specifications and Application Range

Outer Diameter for Cables (mm) 11below 12 12.5 13.5 14 15 16
Inner Diameter for Silicon Tube (mm) 24 26/28 26/28 26/28 28/33 33 33


Outer Diameter for Cables (mm) 24 25 26 28 30 36
Inner Diameter for Silicon Tube (mm) 42/50 42/50 50/55 50/55 50/55 50/55

Wall Thickness: for silicon tube, the minimum wall thickness is 2mm, while the max. is 6mm. if any special requirements, we provide custom-made service as well. The common thickness include 3.0mm, 3.5mm and 4.0mm.
Length: 50/42 Silicone Tube’s standard ex-factory length is 1500m; 40/33 Silicone Tube’s standard ex-factory length is 2000m; 32/26 Silicone Tube’s standard ex-factory length is 3000m. If any special requirements, a longer-length tube can be produced (at any length), provided that traffic and operation were permitted.
Color: any color is possible, also colorful stripes can be on a pure-color silicon pipe.