High Density Polyethylene (HDPE) conduit has been the material of choice to protect the nation's fiber optic highways for decades. RBOC's (Regional Bell Operating Companies), ILEC's (Independent Local Exchange Carriers) and Network Operating companies have used Blue Diamond conduit for their fiber optic cable networks. Buried HDPE Conduit is resistant to chemicals and corrosive soils providing protection and long life. HDPE eliminates maintenance common to aerial networks. The long lengths and tensile strength of the conduit make it ideal for installation technologies of HDD (horizontal directional drilling) and plowing.

Blue Diamond offers a wide range of products in sizes 1/2" through 6" in a variety of colors and striping combinations. Other options include pre-lubrication, pre-installed pull tape, pre-installed cable in conduit and a toneable wire. Blue Diamond complies with RUS/USDA standards, meets Buy America Requirements and all national specifications including ASTM, NEMA and UL.

HDPE Standards and Dimensions

Smooth Wall Duct

Smooth Wall HDPE Duct is the industry standard for easy blowing and pulling of cable due to its low friction walls.

Smooth wall is the industry standard High Density Polyethylene (HDPE) Duct. The interior of smooth wall has a slick finish which delivers a low coefficient of friction for easy blowing or pulling of cable. It can also be pre-lubricated in our manufacturing facility for even lower coefficient of friction. Smooth wall innerduct is a durable high quality product for direct burial and HDD (horizontal directional drilling) applications. Smooth wall is also used as an “innerduct”, meaning several conduits are placed inside a larger casing pipe.

Also available in sizes 2" and under is Superglide, a coextruded permanent low friction layer.  Superglide gives values well below the Bellcore standard of 0.10.

Ribbed Wall Duct

Blue Diamond's Ribbed Wall Duct is designed for extremely long cable pulls. Ribbed Wall innerduct is internally ribbed.

Blue Diamond’s ribbed wall innerduct conduit is designed to allow extremely long cable pulls to glide over the interior raised ribs. Ribbed wall innerduct is internally ribbed and available through 3” diameter in any SDR and SIDR ratings.

Specialty Duct

BDI has the capability to design HDPE conduit for specialty applications, including tracer wire and traceable pull tape.

Blue Diamond has the capabilities to manufacture a variety of HDPE conduit for specialty applications. BDI tracer wire (or toneable) HDPE conduit provides a method of locating underground fiber optic cable using a single copper wire co-extruded onto the wall of the conduit. This provides a traceable corrosion resistant conductor. An alternative method of locating buried fiber optic cable is to use traceable pull tape available pre-installed in any of our duct products.



Blue Diamond has a variety of options for color and identification of your HDPE. The standard color for telecommunications applications is orange. Typical color for power applications is black with red stripes or red. Additional colors available are black, blue, red, green, white, yellow, gray, brown, buff, terra cotta and lilac. Special colors may also be available. Yellow is not recommended as it is the color of gas distribution piping.

In addition to solid colors, Blue Diamond offers a permanently bonded striping option. Striping consists of a single solid color and a coextruded layer of a single contrasting stripe color. Standard striping pattern is three stripes 120 degrees apart.

Blue Diamond SuperGlide®

SuperGlide® is a coextruded inner layer of low friction media provided standard in all Blue Diamond microduct products.  It is also provided as an added option in 1/2" through 2" conduit.  The compound of Siloxane and HDPE lowers the already low friction factor of the conduit to below 0.12.  This is a significant improvement on the Telcordia Bellcore GRE 3155 Core recommended standard of 0.15.


Blue Diamond HDPE innerduct and conduit has standard identification markers for every run. The duct will be marked with the applicable specification identification, duct size, SDR or SCH rating and sequential footage markers every 2’ as well as date, shift and time of manufacture. Custom identifiers such as a logo or custom print line are also available when allowed by the specifications.

Additional Options

Blue Diamond offers additional options for put ups, pre installed cable, and pull tape. In addition we offer lubrication during the extrusion process for any of our products.


Blue Diamond offers a variety of HDPE accessories to help complete your project requirements. Click here for more information.