Direct Bury (DB) 7-way 16/12mm

HDPE Tube Bundle

Direct Bury (DB) 7-way 16/12mm

A bundle of micro/mini-tubes with strengthened walls is encapsulated in a single thin HDPE sheath, enabling seamless retrofitting into existing duct infrastructures for cost-efficient fiber optical cable deployment. Optimized for high-performance air-blowing, the micro ducts feature low-friction inner surfaces that accelerate fiber optical cable installation—critical for FTTH networks, 5G backhaul systems, and metro access networks. Color-coded per Figure 1, the ducts support organized routing of multi-service fibers (e.g., DCI, smart grid), enhancing network scalability and maintenance efficiency in next-gen optical infrastructures.

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Product Description

(Figure 1)

1)	Inner micro duct:	16/12mm
2)	Outer Diameter:	50.4mm * 46.1mm (±1.1mm)
3)	Thickness of sheathing:	1.2mm

Remarks: Ripcord is optional.

Raw materials:

HDPE of a high-molecular type with the following parameters is used for production of the Tube Bundle:

Melt flow index: 0.1 ～ 0.4 g/10 minutes NISO 1133

(190 °C, 2.16 KG)

Density: Min. 0.940 g/cm3 ISO 1183

Tensile strength at yield: Min. 20MPa ISO 527

Elongation at the break: Min 350% ISO 527

Environmental stress crack resist (F50) Min. 96 hours ISO 4599

Construction

1. PE sheath: The outer sheath is manufactured from colored HDPE, halogen free. Normal outer sheath color is orange. Other color is possible upon customer request.

2. Micro duct: The micro duct is manufactured from HDPE, extruded from 100% virgin material. The color shall be grey (central duct), red, green, blue, yellow, orange, grown or other customized.

Technical Specifications

Table 1: Mechanical performance of inner micro duct Φ16/12mm

Pos.	Mechanical performance	Test conditions	Performance	Standard
1	Tensile strength at yield	Rate of extension: 100mm/min	≥1600N	IEC 60794-1-2 Method E1
2	Crush	Sample length: 250mm Load: 1200N Duration of Max. load: 1 minutes Recovery time: 1 hour	The outer and inner diameter shall show, under visual examination without damage and no reduction of diameter greater than 15%.	IEC 60794-1-2 Method E3
3	Kink	≤160mm	-	IEC 60794-1-2 Method E10
4	Impact	Striking surface radius: 10mm Impact Energy: 1J Number of impact:3 times Recovery time: 1 hour	Under visual examination, there shall be no damage to the micro duct.	IEC 60794-1-2 Method E4
5	Bend radius	Number of turns: 5 Mandrel diameter: 192mm Number of cycles: 3	The outer and inner diameter shall show, under visual examination without damage and no reduction of diameter greater than 15%.	IEC 60794-1-2 Method E11
6	Friction	/	≤0.1	M-Line

Table 2: Mechanical performance of Tube Bundle

Pos.	Item	Specification
1	Appearance	Smooth outer wall (UV-stabilized) without visible impurities; well-proportioned color, no bubbles or cracks; with defined markings on outer wall.
2	Tensile strength	Use Pull socks to tension a sample in accordance with table below: Sample length: 1m Tensile speed: 20mm/min Load: 7500N Duration of the tension: 5 min.	No visual damage or residual deformation greater than 15% of the duct assembly outer diameter.
3	Crush Resistance	A 250mm sample after 1 minute load time and 1 hour recovery time. Load (plate) shall be 2000N. The imprint of the plate on the sheath is not considered as mechanical damage.	No visual damage or residual deformation greater than 15% of the duct assembly outer diameter.
Pos.	Item	Specification
4	Impact	Striking surface radius shall be 10mm and impact energy 10J. Recovery time shall be one out. The imprint of the striking surface on the micro ducts is not considered as mechanical damage.	No visual damage or residual deformation greater than 15% of the duct assembly outer diameter.
5	Bend	Diameter of mandrel shall be 40X OD of sample, 4 turns, 3 cycles.	No visual damage or residual deformation greater than 15% of the duct assembly outer diameter.

Storage Temperature

Completed packages of the HDPE Tube Bundle on drums can be stored outdoor max. 6 months upon the date of production.

Storage temperature: -40°C ～ +70°C

Installation temperature: -30°C ～ +50°C

Operating temperature: -40°C ～ +70°C

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