DUROFLEX PLUS ISR 3-layer pliable conduit

  • CLASS:33332

The new 3layer conduit DUROFLEX PLUS medium type (750Nt) is substantially upgraded and constitutes an innovative solution to the electrical installation. The outer surface is corrugated providing flexibility and high mechanical strength, whilst the inner layer secures a smoother surface for cable routing. The third layer creates a color marking, of indelible color, for distinguishing power and telecommunication cables.

KOUVIDIS is the 1st company in Europe to dare such an investment and launched double structured wall conduits in small diameters Ø25 and Ø32.

This innovation was acknowledged by the Greek Marketing Academy and received the Golden Award in the category “Innovative Industrial Product”.


DUROFLEX PLUS conduit is extra UV resistant, halogen free, low smoke and low acidity and has lower friction (up to 50%) for the smoother cable routing.

Along with the 3layer rigid conduit DUROSOL PLUS, the fittings (connection coupler, clip, adaptor) and junction box with seals, all in black color RAL 9004, they compose a special conduit system which is capable of covering multiple needs at the electrical installation.


  • APPLICATION STANDARD:EN 61386.22, ΕΝ 50642, ΕΝ 60754-2, ΕΝ 61034-2
  • COLOR:RAL 3020 red (inner layer), RAL 9004 black (outer layer)
  • NOMINAL DIAMETER:Nominal outer diameter (DN/OD)
  • Product Conformity to all requirements of relative European Directives.
  • The product and its production process are inspected and approved by VDE German institute
  • Minimum resistance to compression
  • Ingrees protection against solid objects and water (EN 60529)
  • Product with extra UV stability
  • Non flame propagating product
  • Friction Reduction at the internal wall of conduits
  • Low smoke during combustion
  • Product is made of halogen free raw materials
  • Product is not an attractive food to rodents
  • Min-max permanent application temperature
  • Antistatic Technology IAS (Patent Protected 1009870)
  • Antiscratch Technology ISR
  • Longitudinal stripes of indelible color indicate the power of the protected cables
  • Low acidity
150% lower friction due to ultra slip material added in the internal layer (test conducted according to IEC/TR 62470)
2High compression (750Nt) and impact (2J) resistance, (medium type) in low temperature of -15oC
3Ideal for concealed and surface type installations
4No toxic or corrosive gases in case of fire
5Better visibility of escape ways in case of fire
6Very good performance over concrete chemical substances
7High mechanical resistance in high temperature of (105oC)
8Not attractive to rodents (European Patent EP2698792)
9Exceptional resistance to UV radiation
10Marked using embossed printing and packed with 100% recyclable polyethylene film including safety straps and an informative red color label
11Incorporates antistatic technology which protects against static electricity (Patent Protected: 1009810)
12Incorporates anti-scratch technology which reduces the surface wear on the inner layer caused by cable routing (Patent Protected: 1010513)
Properties Class
Resistance to compression 750Nt/5cm 3
Resistance to impact 2J (at-15oC) 3
Lower temperature range -15oC 3
Upper temperature range +105oC 3
Resistance to bending Pliable 2
Electrical characteristics With electrical insulated characteristics 2
Protection against ingress of solid objects min IP65 6
Protection against ingress of water min IP65 5
Resistance against corrosion Not applicable 0
Tensile strength None declared 0
Resistance to flame propagating Non flame propagating 1
Suspended load capacity None declared 0
Fire effects None declared 0
Environmental impact Halogen Free 1


Additional properties
Raw material Halogen free, heavy metals free (RoHS) and specially stabilized thermoplastic PO blend
Ageing resistance UV stabilized
Rodent repellent Not attractive to rodents
Lower frictions Ultra slip material added in the internal layer
Color marking Longitudinal stripes of indelible color indicate the power of the protected cables
Halogen free No toxic or corrosive gases in case of fire
Low smoke Better visibility of escape ways
Antistatic technology Protection against static electricity
Antiscratch Technology Protection against scratching from cable routing
Type Part Number

power / telecommunication


Ø16 2050016 / 2051016 16 10.5 50 2.82 6300
Ø20 2050020/2016020 20 13.7 50 3.55 3750
Ø25 2050025/2016025 25 17.7 25 2.32 1750
Ø32 2050032/2016032 32 23.5 25 3.29 1500
  • Recommended
  • Not recommended
  • Ideal according to the manufacturer
Concealed (underplaster)
Concealed (dry wall)
Underfloor in screed
Buried Wood (underground)
Concealed floor / ceiling
Reach Declaration
Product guide
ISO 9001 Certificate
VDE RoHS Certificate
DUROFLEX PLUS – Declaration of Conformity
DUROFLEX PLUS – VDE Marks Approval
DUROFLEX PLUS – VDE Test Report (acidity test)
DUROFLEX PLUS – VDE Test Report (halogen free test)
DUROFLEX PLUS – VDE Test Report (low smoke test)
DUROFLEX PLUS – Product Data Sheet
RoHS Declaration of Conformity