Optotelecommunication tubes

OPTEL casing pipes are used for the construction of secondary telecommunications cable ducts and cable pipelines. They are made of high-density polyethylene (HDPE).

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Designation Outer diameter
[ mm ]
Diameter tolerance
[ mm ]
Wall thickness
[ mm ]
[ mb ]
RHDPE OPTEL Ø 25×2.0 25 + 0.2 2.0 250
RHDPE OPTEL Ø 25×2.3 25 + 0.2 2.3 250
RHDPE OPTEL Ø 32×2.0 32 + 0.3 2.0 250
RHDPE OPTEL Ø 32×2.9 32 + 0.3 2.9 250
RHDPE OPTEL Ø 40×3.7 40 + 0.4 3.7 250
RHDPE OPTEL Ø 50×4.4 50 + 0.5 4.4 250



OPTEL casing pipes are used for the construction of secondary telecommunications cable ducts and cable pipelines. They are made of high-density polyethylene (HDPE).


The inner surface of OPTEL pipes is longitudinally grooved and covered with a slip layer, which is made by stamping during the production process. It has an appropriate thickness and is permanently bonded to the pipe material, and therefore does not tear (e.g. in bends) when the cable is pulled on, and does not change its properties over many years of operation.
Due to the sliding layer with the friction coefficient = <0.1, sections of optical fiber cables are pulled in one operation into the sewage system made of OPTEL pipes, twice as long as those without the slip layer.

Comparison of the friction coefficient

Type of pipe Coefficient of friction
RHDPE pipe (internal smooth surface) =< 0,30
RHDPE pipe (grooved without slip layer) =< 0,20
RHDPE OPTEL pipe (grooved with a slip layer) =< 0,10



A cord (PP cord) with a tearing strength> = 800 N allows mechanical drawing of a cable with a length of approx. 500 m in a single operation to the earth pipeline (with a small number of pipe bends), or approx. 300 m to the secondary sewage system.


The raw material for the production of casing pipes is high-density polyethylene (HDPE) with the following properties:

Density – minimum 0.941 g / cm3

Melt flow rate MFR (temperature 190 ºC / 5 kg) – from 0.3 to 1.3 g / 10min;

Oxidation induction time at 200 ºC -> 20min

The relative elongation at break is at least 350%.

Teflon-based skid layer material compatible with HDPE


Pipe ovality +/- 4% D, where D is the nominal pipe diameter.

The length of the sections is 250 meters + 1%.

The internal pressure resistance is at least 1 MPa for 30 minutes.

Pipe sections subjected to the impact test with a 3 kg weight from a height of 1 meter at -20 ° C do not show any cracks or scratches.

The average relative change in pipe length after annealing at 110 ° C does not exceed 3%.

The coefficient of friction is not greater than 0.2 for pipes without a slip layer and 0.1 for pipes with a slip layer.

* the length of the sections can be adjusted to the customer’s requirements

The minimum bend radius of the pipes when laying the pipeline depends on its diameter and the ambient temperature during the works.

Ambient temperature Multiplicity of the diameter Ø 25 (mm) Ø 32 (mm) Ø 40 (mm) Ø 50 (mm)
20ºC 20dn 500 650 800 1000
10ºC 35dn 875 1100 1400 1750
0ºC 50dn 1250 1600 2000 2500



Pipes should be stored on a flat surface, in a horizontal position. The height of the pipes’ storage should not exceed 2.0 m (4 coils one on top of the other). Pipes can be stored outdoors for a period not longer than 2 months from the date of production without any additional protection.
Storage for a period longer than 2 months requires the protection of the products against the influence of ultraviolet radiation. It is forbidden to stay with open fire near the stored products.
If the pipes are covered with tarpaulins that do not let the light through, ensure good ventilation of these products.


The inscriptions on the pipes are made using the ink method, e.g .:

Manufacturer’s mark: MTB

Type (material) designation: RHDPE OPTEL

Dimensions outer diameter x wall thickness: 40×3.7

Designation of ring stiffness: SN 450N

Technical Approval No.: KDWU 03/07/2020

Production identification (date and time): 18/02/17. 08:32

It is possible to print the name of the ordering party.