HDPE Silicore Duct for Fiber Optic Cable Protection

HDPE Silicore Duct For Fiber Optic Cable Protection

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HDPE Silicore Duct for Fiber Optic Cable Protection HDPE silicore duct, also called High-density polyethylene silicore plastic duct, is a high performancde conduit made from high-density polyethylene (HDPE) with a permanent solid lubricant silicore inner layer. This inner layer significantly reduces friction, making it ideal for

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HDPE Silicore Duct for Fiber Optic Cable Protection

HDPE silicore duct, also called High-density polyethylene silicore plastic duct, is a high performancde conduit made from high-density polyethylene (HDPE) with a permanent solid lubricant silicore inner layer. This inner layer significantly reduces friction, making it ideal for fiber optic cable blowing installations over long distances.

Other common names for HDPE silicore duct:

HDPE silicon core pipe

Silicore plastic duct

Fiber optic conduit

Communication conduit/duct

Underground duct

Highway communication duct

Silicore inner lubricated duct

Fiber optic blowing duct

Standard for HDPE silicore duct:

JT/T496-2018

High-density polyethylene silicore duct for highway underground communication conduit.

GB/T24456-2009

High-density polyethylene silicore plastic duct

Classification of HDPE silicore duct:

The most common classification of HDPE silicore duct is by configuration,

l Single duct

l Multi-duct/bundle duct

Single duct: usually called single silicore duct, standard HDPE silicore pipe, it consists of a high-density polyethylene outer layer and a permanent solid silicone inner lubricating layer, and typically features an outer color stripe.

single duct section

Single duct production specification:

specification	Average OD mm		Wall thickness mm		Out of roundness
specification	Standard data	Tolerance allowance	Standard data	Tolerance allowance	Before winding the reel	After winding the reel
φ32/26	32	+0.3 /0	2.5	+0.3/-0.2	≤2	≤3
φ34/28	34	+0.3 /0	3.0	+0.3/-0.15	≤2	≤3
φ40/33	40	+0.4 /0	3.5	+0.35/-0.2	≤2.5	≤3.5
φ46/38	46	+0.4 /0	4.0	+0.35/-0.2	≤3	≤5
φ50/41	50	+0.5 /0	4.5	+0.40/-0.3	≤3	≤5
φ63/54	63	+0.6 /0	5.0	+0.40/-0.3	≤3	≤5

Multi-duct / bundle duct, usually called microduct bundle, nulti-way silicore duct, it consists of multiple miniature silicone-cored tubes (microtubes) encased within a high-density polyethylene outer tube that lacks a silicone core layer, the outer tube tightly envelops the internal microtubes, forming a unified structural entity.

bundle duct section structure

Multi-duct/bundle duct specification:

Specification	OD of outer tube mm	OD of microtube mm	Wall thickness of microtube mm
Four way bundle tube 4x 12/9	33.97	12	1.5
Seven way bundle tube 7x 12/9	41	12	1.5
Four way bundle tube 4x 14/10	36.2	14	2.0
Seven way bundle tube 7x 14/10	44.4	14	2.0

HDPE silicore duct physical and chemical performance

Item	32/26	34/28	40/33	46/38	50/41	63/54
Outer wall hardness / HD	≥59
Inner wall friction coefficient	Static: ≤0.25(plate method, for HDPE standard test bars)
	Dynamic: ≤0.15(round drum method)
Tensile yield strength Mpa	≥20
Elongation at break %	≥350
Maximum towing load. N	≥5000	≥6000	≥8000	≥10 000	≥11 000	≥12 000
Cold bending performance	Conduct cold bending tests on silicore tubes of the corresponding specifications according to the following bending raius, and there should be no cracking or obvious stress whitening.
	300mm	300mm	400mm	500mm	625mm	750mm
Ring stiffness Kn/m2	≥50			≥40		≥30
Recovery rate	When pressure is applied vertically until the deformation of the outer diameter reaches 50% of the original outer diameter, immediately unload. The sample does not crack or delaminate, and the outer diameter can naturally recover to more than 85% of the original within 10 minutes.
Pendulum impact performance	Under the conditions of -20 ℃ and a height of 2 meters, using a 15.3kgs hammer to impact 10 samples, at least 9 samples should pass
Hydrostatic performance	Under 20℃ and 2.0Mpa water hydrostatic pressure, hold for 15 mins, samples no visible crack, no break
Longitudinal shrinkage rate %	≤3.0
Environmental stress cracking resistance	48hours, number of failures≤20%
Carbon-hydrogen compound resistance performance	After soaking in heptane for 720hours, an external force of 528N is applied to the silicone core tube, the sample does not get damaged, and the permanent deformation does not exceed 5%

Application of HDPE silicore duct

HDPE silicore ducts are widely used in modern communication infrastructure:

l Telecommunications

Fiber optic cable installation (FTTH, FTTx networks)

Backbone and long-haul fiber networks

l Urban Infrastructure

Underground cable routing in cities

Smart city and 5G network deployment

l Highway and Railway Projects

Communication cable protection along transport corridors

l Data Centers & Industrial Networks

High-speed data transmission systems

HDPE silicore duct is an essential solution for modern fiber optic infrastructure, offering superior performance in cable installation efficiency and long-term durability. With multiple classifications and wide-ranging applications, it is the preferred choice for telecom operators, contractors, and infrastructure developers worldwide.

HDPE Silicore Duct For Fiber Optic Cable Protection

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