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Conduit & Fittings

HDPE Microduct

HDPE microduct is used in fiber optic networks where maximizing pathway capacity and enabling future expansion are critical. By installing multiple small-diameter conduits—starting at just 5mm—within a single pathway, microduct systems allow operators to add or upgrade fiber without additional construction. Whether you're building an FTTH network, increasing capacity in existing conduit, or planning long-term infrastructure, Galloway stocks HDPE microduct in a range of sizes and configurations to support your build.

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Features

The options below are what you set to match microduct to a specific build — diameter, direct-bury versus direct-install, fill state, and fire rating — so the pathway fits the install method and environment.

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    Available from 5mm to 27mm OD

    Enables multiple microducts to be installed within a single conduit, maximizing pathway capacity

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    Supports multiple independent fiber pathways

    Each microduct can carry its own cable for staged deployment and future expansion

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    Internal ribs

    Standard on most sizes, reduces friction during fiber installation; smooth interior available on smaller ID sizes

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    Two configurations

    Direct Bury (DB) for underground installation and Direct Install (DI) for placement inside existing conduit

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    Designed for air-assisted fiber installation (jetting)

    Enabling longer installation distances with reduced cable stress

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    Multi-configuation

    Available empty, with pull string, or with factory-installed fiber cable

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    Fire-retardant options

    Riser, Plenum, LSZH - for indoor and building applications

Technical Specifications

Microduct uses metric sizing (OD/ID in millimeters). The following represents our standard stocked range. Need a specific size, configuration, or pre-installed fiber? Give us a call. We’ll figure it out.

Specification Standard Stocked Range

Material

High-Density Polyethylene (HDPE)

Available Sizes (OD/ID)

5/3.5, 7/3.5, 7/5.5, 8/6, 8.5/6, 10/8, 12/10, 12.7/8, 12.7/10, 14/10, 16/12, 16/13, 18/10, 18/14, 22/16, 27/20 (all in mm)

Product Types

Direct Bury (DB) — thicker wall for underground | Direct Install (DI) — thinner wall for inside existing conduit

Internal Ribs

Standard on most sizes; smooth interior on 3.5mm ID

Fiber Capacity

Up to 12 fibers (5/3.5mm) through 432 fibers (22/16mm and 27/20mm)

Recommended Fill Ratio

50%–75% cable-to-duct ratio for optimal jetting performance

Fire-Retardant Options

Riser, Plenum, and LSZH rated versions available

Pull String

Factory pre-installed pull string available; pre-installed fiber cable also available

Standard Colors

Blue, orange, green, brown, gray, white, red, black, yellow, terra cotta. Custom colors available.

Conduit Markings

Permanent marking includes material type, applicable standards, production information, and sequential foot/meter markings. Custom marking available.

Microduct Capacity Reference

Recommended Fiber Fill Ratios: Microduct sizing is driven by fiber diameter, fill ratio, and installation method. The following reference tables provide general guidance for cable capacity and conduit fill based on standard configurations.

Microduct Size (OD/ID)

Max Fiber Count

Cable OD Range (mm)

5/3.5 mm

Up to 12

1.8–2.6

8.5/6 mm

Up to 96

3.0–4.5

10/8 mm

Up to 96

4.0–6.0

12.7/10 mm

Up to 144

5.0–7.5

14/10 mm

Up to 144

5.0–7.5

16/12 mm

Up to 192

6.0–9.0

16/13 mm

Up to 288

6.5–9.8

18/10 mm

Up to 144

5.0–7.5

18/14 mm

Up to 288

7.0–10.5

22/16 mm

Up to 432

8.0–12.0

22/18 mm

Up to 432

9.0–13.5

27/20 mm

Up to 432

10.0–15.0

Recommended Microduct-to-Conduit Fill Ratios: The number of microducts that can be installed within a conduit depends on both the microduct size and the conduit inside diameter. The following table provides general capacity guidelines for common microduct and conduit size combinations:

Conduit Size

16/13 mm

12.7/10 mm

12/10 mm

10/8 mm

1”

1

2

2

3

1 1/4”

2

3

4

5

1 1/2”

2

4

6

8

2”

5

7

8

10

Note: Actual capacity varies based on conduit path, bend radius, elevation changes, and installation method.

Technical Specifications

Specification Standard Stocked Range Standard Stocked Range
 Standard Stocked Range Standard Stocked Range

Material

High-Density Polyethylene (HDPE)

 

 

 

Available Sizes

3/4” through 6” diameter

 

 

 

SDR Options

SDR 7, 9, 11, 13.5, 15.5 (controlled by outside diameter and minimum wall thickness)

 

 

 

SIDR Options

SIDR 9, 11.5 (controlled by inside diameter and minimum wall thickness)

 

 

 

Schedule Options

Schedule 40 and Schedule 80

 

 

 

Standards Compliance

ASTM D3035, ASTM D2239, ASTM F2160

 

 

 

Listings

RUS Listed for telecommunications applications

 

 

 

Pull Tape

Available empty or with factory pre-installed pull tape (1,250 lb typical tensile strength)

 

 

 

Standard Colors

Orange, blue, green, black, white, red, brown, gray, terra cotta, yellow. Custom colors and stripe combinations available.

 

 

 

Reel Sizes

66”, 84”, 96”, 102”, 114” diameter steel reels

 

 

 

Conduit Markings

Permanent marking includes material type, applicable standards, production information, and sequential foot/meter markings. Custom marking available.

 

 

 

Brands we carry

Need Microduct for Your Next Build?

Galloway stocks HDPE microduct across our distribution network, with sizes and configurations to support both new construction and capacity expansion projects. Whether you're planning fiber counts, evaluating fill ratios, or determining the right microduct configuration for your installation, our team can help you identify the right solution and ensure the correct material is supplied.

Whether you’re working a full build-out or just need the final pallet to finish a job, we keep your projects moving forward.

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Talk to a local specialist

Fort Myers, FL
(239) 481-7448
Tampa, FL
(813) 443-5598
Miami, FL
(786) 378-4615
New Castle, DE
(302)-317-1502
Columbus, OH
(614) 414-0861
Greenfield, IN
(317) 947-6271
Parker, CO
(720) 683-6100
Phoenix, AZ
(623) 738-2800
Tyler, TX
(430) 341-0010
Chesapeake, VA
(757) 263-0159