Direct Bury (DB) 7-way 7/3.5mm

HDPE Tube Bundle

Direct Bury (DB) 7-way 7/3.5mm

A bundle of micro- or mini-tubes with strengthened wall thickness is encased in a single thin HDPE sheath, forming a duct assembly specifically engineered for fiber optical cable deployment. This robust design enables versatile installation—either retrofitted into existing ducts or directly buried underground—supporting seamless integration into fiber optical cable networks.

The micro ducts are optimized for high-efficiency fiber optical cable blowing, featuring an ultra-smooth inner surface with low-friction properties to minimize resistance during air-assisted cable insertion. Each micro duct is color-coded per Figure 1, facilitating quick identification and routing of fiber optical cable types (e.g., single-mode, multi-mode) during network installation and maintenance.

Product Detail

FAQ

Product Tags

Product Description

(Figure 1)

1)	Inner micro duct:	7/3.5mm
2)	Outer Diameter:	23.4mm * 21.6mm (±0.5mm)
3)	Thickness of sheathing:	1.2mm (±0.2mm)

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 Min 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 blue (central duct), red, green, yellow, white, grey, orange or other customized.

Technical Specifications

Table 1: Mechanical performance of inner micro duct Φ7/3.5mm

Pos.	Mechanical performance	Test conditions	Performance	Standard
1	Tensile strength at yield	Rate of extension: 100mm/min	≥520N	IEC 60794-1-2 Method E1
2	Crush	Sample length: 250mm Load: 2450N 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	≤70mm	-	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: 84mm 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: 2750N 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 2500N. 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 duct 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

Products Recommended

Fiber Optic Cleaner Pen 2.5mm Type

The one-click fiber optic cleaner pen is easy to use and can be used to clean connectors and exposed 2.5mm collars in the fiber optic cable adapter. Simply insert the cleaner into the adapter and push it until you hear a “click”. The push cleaner uses a mechanical push operation to push the optical-grade cleaning tape while rotating the cleaning head to ensure that the fiber end surface is effective but gentle clean.

VIEW MORE
OYI-FTB-16A Terminal Box

The equipment is used as a termination point for the feeder cable to connect with drop cable in FTTx communication network system. It intergtates fiber splicing, splitting, distribution, storage and cable connection in one unit. Meanwhile, it provides solid protection and management for the FTTX network building.

VIEW MORE
UPB Aluminum Alloy Universal Pole Bracket

The universal pole bracket is a functional product that plays a vital role in various industries. It is mainly made of aluminum alloy, which gives it high mechanical strength, making it both high-quality and durable. Its unique patented design allows for a common hardware fitting that can cover all installation situations, whether on wooden, metal, or concrete poles. It is used with stainless steel bands and buckles to fix the cable accessories during installation.

VIEW MORE
OYI-F234-8Core

This box is used as a termination point for the feeder cable to connect with drop cable in FTTX communication network system. It integrates fiber splicing, splitting, distribution, storage and cable connection in one unit. Meanwhile, it provides solid protection and management for the FTTX network building.

VIEW MORE
OYI-FAT16J-B Series Terminal Box

The 16-core OYI-FAT16J-B optical terminal box performs in accordance with the industry standard requirements of YD/T2150-2010. It is mainly used in the FTTX access system terminal link. The box is made of high-strength PC, ABS plastic alloy injection molding, which provides good sealing and aging resistance. In addition, it can be hung on the wall outdoors or indoors for installation and use. The OYI-FAT16J-B optical terminal box has an inner design with a single-layer structure, divided into the distribution line area, outdoor cable insertion, fiber splicing tray, and FTTH drop optical cable storage. The fiber optical lines are very clear, making it convenient to operate and maintain. There are 4 cable holes under the box that can accommodate 4 outdoor optical cables for direct or different junctions, and it can also accommodate 16 FTTH drop optical cables for end connections. The fiber splicing tray uses a flip form and can be configured with 16 cores capacity specifications to accommodate the box’s expansion needs.

VIEW MORE
Direct Bury (DB) 4-way 14/10mm

A bundle of micro- or mini-tubes with strengthened wall thickness is encased in a single thin HDPE sheath, forming a duct assembly specifically engineered for fiber optical cable deployment. This robust design enables versatile installation—either retrofitted into existing ducts or directly buried underground—supporting seamless integration into fiber optical cable networks. The micro ducts are optimized for high-efficiency fiber optical cable blowing, featuring an ultra-smooth inner surface with low-friction properties to minimize resistance during air-assisted cable insertion. Each micro duct is color-coded per Figure 1, facilitating quick identification and routing of fiber optical cable types (e.g., single-mode, multi-mode) during network installation and maintenance.

VIEW MORE

If you're looking for a reliable, high-speed fibre optic cable solution, look no further than OYI. Contact us now to see how we can help you stay connected and take your business to the next level.

INQUIRE