BERLIA PLB Duct (Permanent Lubricated HDPE Duct)

BERLIA PLB Duct stands for Permanent Lubricated Duct, a specially manufactured HDPE telecom duct used for laying Optical Fiber Cable (OFC) through cable blowing or pulling methods. The inside surface contains a permanent lubricated (silicon) layer to reduce friction and allow longer cable blowing distances.

BERLIA HDPE PLB Duct – Technical Details

Parameter	Specification
Full Form	Permanent Lubricated Duct
Material	HDPE (High Density Polyethylene)
Application	Optical Fiber Cable (OFC) protection
Inner Layer	Permanently lubricated silicon core
Installation Method	Air blowing / cable pulling
Type	Smooth inner & outer / ribbed inner
Standard	TEC / BSNL / telecom specifications/ GR/CDS / others
Color	Available in different colors like Red, Yellow, Blue, Green, Purple, Grey, Orange, Brown, Pink, White, Natural, and custom colors
Coil Length	500 m / 1000 m / custom
Jointing	Push-fit coupler / compression coupler
UV Stabilized	Yes
Service Life	50 years (typical)

 

BERLIA PLB DUCT TEC APPROVED/ DOT APPROVED / BSNL APPROVED OR AS PER SPECIFICATIONS(TEC/GR/FA/CDS-008/04/AUG-19)

Size (OD/ID) mm	Outer Diameter Tolerance	Wall Thickness	Inner Lubricated Layer Thickness	Max Ovality	Standard Coil Length	Max OFC Diameter for Blowing
32/26 mm	32.0 +0.3 / -0.0 mm	3.0 ± 0.2 mm	0.24 – 0.36 mm	1.3 mm	1000 ± 100 m	12 mm
40/33 mm	40.0 +0.4 / -0.0 mm	3.5 ± 0.2 mm	0.28 – 0.42 mm	1.4 mm	1000 ± 100 m	16 mm
50/42 mm	50.0 +0.5 / -0.0 mm	4.0 ± 0.3 mm	0.32 – 0.48 mm	1.4 mm	1000 ± 100 m	21 mm
63/50 mm	63.0 +0.6 / -0.0 mm	6.5 ± 0.4 mm	0.36 – 0.54 mm	1.5 mm	500 ± 50 m	25 mm (144F OFC)
110/80 mm	110.0 +1.0 / -0.0 mm	15.0 ± 0.6 mm	0.56 – 0.84 mm	2.2 mm	200 ± 20 m	40 mm (576F OFC)

 

BERLIA PLB Duct Basic Construction Details

Parameter	TEC Requirement
Construction	Co-extruded PLB HDPE Duct
Outer Layer	UV Stabilized HDPE
Inner Layer	Permanently Lubricated / Silicon Coated
Inner Layer Color	White
Outer Identification	4 longitudinal white stripes (minimum 3 mm width)
Standard Colors	Green, Orange, Blue, Yellow, Brown, Violet, Grey, Red
Application	Underground OFC Cable Installation

 

Advantages of HDPE PLB Duct

Benefit	Description
Low Friction	Easier cable blowing
Long Cable Distance	Reduced blowing resistance
High Flexibility	Easy handling
Corrosion Free	Long life underground
Impact Resistant	Good mechanical strength
Water Resistant	Suitable for buried routes
UV Resistant	Outdoor storage possible

 

Typical Applications (Industry wise Segregation)

Sector	Usage
Telecom	OFC backbone
Bharat Net	Rural fibre network
NHAI	Highway OFC routes
Railways	Signalling & telecom
Smart Cities	Communication backbone
Data Centres	Fiber connectivity

 

BERLIA PLB Duct is widely used in BSNL, Telecom operators, Bharat Net, CM Grid, highway OFC, NHAI, 4G, 5G Projects and smart city projects for fibre optic cable protection.

BERLIA SPECIAL HDPE PLB DUCTS (Special construction and specific applications) (LINK)

Special PLB (Permanently Lubricated) HDPE Ducts are customized telecom ducts designed to meet specific project requirements beyond standard TEC specifications. These ducts are engineered for demanding installation conditions, higher cable capacities, enhanced protection, and specialized infrastructure applications.

They are commonly used in telecom, defence, smart city, railway, highway, industrial, and utility projects where standard PLB ducts may not fully satisfy operational or environmental requirements.

Type of Special PLB Duct	Description	Typical Applications
Silicon Core PLB Duct	Enhanced low-friction inner layer for longer cable blowing distance	Long-distance OFC installation
Multiway PLB Duct	Multiple ducts combined in one assembly	Telecom backbone and smart cities
Ribbed Inner Surface PLB Duct	Reduced friction for cable pulling/blowing	High-density fibre projects
Heavy Duty PLB Duct	Higher wall thickness and crush resistance	High traffic and industrial areas
Flame Retardant PLB Duct	Fire-resistant formulation	Tunnels, metro rail, indoor installations
Rodent Resistant PLB Duct	Additional protection against rodent damage	Rural and underground telecom networks
Anti-Termite PLB Duct	Resistant to termite attack	Sensitive underground installations
UV Stabilized PLB Duct	Enhanced weather resistance	Outdoor exposed installations
Coloured / Customized PLB Duct	Utility-specific identification colours	Multi-operator telecom networks
Armoured PLB Duct	Reinforced for mechanical protection	Railway, mining, defence projects
Low Smoke Zero Halogen (LSZH) PLB Duct	Reduced toxic emissions during fire	Critical infrastructure and buildings
High Compression PLB Duct	Designed for deep burial and heavy loads	Airports, highways, industrial zones

PLB Duct Pipes Manufacturers and Suppliers

BERLIA PIPES manufactures PLB Duct Pipes from High Density Poly Ethylene (HDPE) that are coated inside with silicon for permanent lubrication, aiding in easy installation as conduits for underground cabling. These pipes are produced at our state-of-the-art extrusion plants as per DOT Specification GR/CDS-08/02 Nov. 2004 amendments.

PLB Pipes are used as underground cable conduits for optical fiber cables, communication cables, etc., and are suitable for cable installation by blowing or pulling by rope techniques.

'BERLIA PIPES' was among the very first manufacturers to acquire the technology and equipment for establishing a complete manufacturing facility for PLB HDPE Ducts.

At BERLIA PIPES, PLB Pipes (duct pipes) are manufactured using an ultra-violet (UV) stabilized grade of HDPE with required Anti-Oxidant content and other recommended additives. The inner layer of ducts is duly silicon coated, which minimizes friction between the OFC and the duct during the cable blowing process, enabling smooth installation of OFC in the duct without damaging the cable fibre.

Berlia PLB Duct Pipes are engineered for superior performance and safety. Designed to be anti-rodent, these pipes ensure durability by resisting damage from pests. Additionally, they are non-flammable and fire-retardant, providing an extra layer of safety in critical installations. Choose Berlia for reliable and secure piping solutions.

Features

• Environment Stress Crack Resistance (ESCR)
• Impact Resistance
• Crush Resistance
• Low Coefficient of Friction
• High Temperature Resistance
• High Ultraviolet (UV) protection

Features

• 40/33 mm
• 32/26 mm
• 50/42 mm
• 63/50 mm

Applications

COM-line Ducts are suitable for installation in the field dirt trenches, under sidewalks, roads, within communication networks, between communication centers and between cities. They can also be used in branch networks between cells, distribution cabinets, poles, in walls and within subterranean networks of homes, allowing the insertion of communication cables-optical or copper, as well as TV/cable aluminum coaxial cables. Cables can be inserted in through the pipe by blowing, with an internal air-pressure up to eight bars.