PE Silicon Core Pipe

PE silicone core pipe is a kind of composite pipe with silicone gel solid lubricant on the inner wall, which is mainly used for optical cable protection. The outer wall is made of high-density polyethylene (HDPE), and the inner wall is made of PE and silica gel mixture by composite extrusion, which is characterized by small friction coefficient of the inner wall (only 0.08-0.15) and good lubrication performance.

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Product Features Application Areas Specification & Dimension Performance Indicators

Product Features

1. Good lubrication performance: small friction coefficient of inner wall, using blowing method to thread the cable, fast construction;
2. Good water resistance: good water resistance and chemical resistance, applicable to various environmental conditions;
3. Good weather resistance: good cold resistance and heat resistance, applicable temperature range of -30℃～80℃;
4. Long service life: more than 50 years in case of underground buried use, excellent anti-aging performance.

Application Areas

HDPE silicon core pipe is widely used in the laying of long-distance optical fiber cables, which is especially suitable for complex terrain and occasions requiring frequent bending and laying due to its lubrication of the inner wall, convenient construction and long service life.

1. Pre-buried pipes of expressway and railroad;

2. Underground communication cables in cities.

Specification & Dimension

DN	Average External Diameter	Wall Thickness	Out-of-roundness(%)
DN	dem/mm	(mm)	Before winding	After winding
32/26	32.0～32.3	2.50～2.80	≤2	≤3
34/28	34.0～34.3	3.00～3.30	≤2	≤3
40/33	40.0～40.4	3.50～3.85	≤2.5	≤3.5
46/38	46.0～46.4	4.00～4.35	≤3	≤5
50/41	50.0～50.5	4.50～4.90	≤3	≤5
63/54	63.0～63.6	5.00～5.40	≤3	≤5

DN	Nominal Length(m)	Length Deviation(%)
32/26	3000	≥+0.3
34/28	3000	≥+0.3
40/33	2000	≥+0.3
46/38	1500	≥+0.3
50/41	1500	≥+0.3
63/54	1000	≥+0.3

Performance Indicators

Test Item	Indicator						Test Method
	32/26	34/28	40/33	46/38	50/41	63/54
Hardness(outer wall)	≥59						GB/T2411
Friction Coefficient(inner wall)	≤ 0.25 in static state (plate method)						GB/T 24456-2009
Tensile Yield Strength（Mpa）	≥20						GB/T 8804.1-2003
Elongation at break	≥350%						GB/T 8804.1-2003
Maximum traction load（N）	≥5000	≥6000	≥8000	≥10000	≥11000	≥12000	GB/T 24456-2009

Cold Bending Performance	After cold bending test, there should be no cracking, no obvious stress whitening phenomenon						GB/T 24456-2009
	300mm	300mm	400mm	500mm	620mm	750mm
Ring Stiffness（kN/m2）	≥50			≥40		≥30	GB/T 9647-2003
Recovery Rate(%)	Vertical pressure to the pipe, when OD deformation becomes 50% of original OD, immediately unloading, the sample does not crack, no delamination, 10 minutes later, can naturally recover to the original 85% or more.						GB/T 9647-2003

Impact resistance of falling hammer	At a temperature of -20℃ and a height of 2m conditions, 10 samples should be impacted with a 15.3kg hammer, 9 or 10 samples should be passed.						GB/T 141552-2001
Hydraulic Resistance	At a temperature of 20 ℃ and water pressure of 2.0MPa conditions, keep 15min, no visible crack						GB/T 6111-2003
Longitudinal retraction rate	≤3.0%						GB/T 6671-2001
Resistance to environmental stress cracking	48h，Number of failures ≤ 20%						GB/T 1842-2008
Resistance to carbon-oxygen compound	After soaking with heptane for 720h and applying an external force of 528N to the silicon core tube,the specimen is not damaged and the resulting permanent deformation does not exceed 5%.						GB/T 24456-2009

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