Microducts and Microduct Assemblies

Microducts and microduct assemblies are available for several installation environments such as direct buried installation, into existing pipes or for indoor installation.

Basically two type of microduct assemblies are available:

• Thick Walled Ducts (TWD)

• Tight Protected Ducts (TPD)


Thick Walled Ducts (TWD) are characterized by heavy wall microducts and a relatively thin outer sheath. The microducts themselves are rugged enough to protect the fiber cables inside. Typical dimensions for TWD are (OD/ID): 7/3.5 mm, 14/10 mm, 16/12 mm and 18/12 mm


Tight Protected Ducts (TPD) are characterized by one or several sheets that protect the relatively thin walled microducts. The sheets form a thick protective layer that in combination with the microducts protect the fiber cable or blown fiber. Typical dimensions for TPD are (OD/ID): 3/2 mm, 5/3.5 mm, 10/8 mm and 12/10 mm


Tight protected ducts have a substantially higher impact resistance compared to thick walled ducts and are therefore a safer choice in many installations. Thick walled ducts simplify jointing and branching of ducts which results in a slightly lower installation cost.


Microducts and microduct assemblies for certain installation types, e.g. aerial installation and indoor installation are only available as TPD. However, TWD and TPD may be connected in the same network using reduction connectors.