Advantages & Features (SWC)

  • Enhance corrosion protection.
  • Economical in comparison of conventional sheathing ducts
  • Lower values of wobble co-efficient (k) & friction co-efficient (µ) than metallic ducts.
  • Better bonding with the concrete due to higher - close corrugations.
  • All required Accessories are available with us in-house.
  • Also available in long lengths and hence minimum joints
  • Corrosion protection
  • Water tightness
  • Easy handling & speed installation due to fewer joints
  • Good weathering resistance.
  • Corrosion monitoring of tendons is possible
  • Helps electrical monitoring of tendons.
  • Enhances fatigue life of concrete ( bridges & Flyovers )
  • Good impact and compression strength
  • High stiffness and flexibility
  • Chemically inert
  • Environment friendly
  • Joining is very easy
  • Even when bend cross section of ducts retains its circularity
  • Therefore these ducts are strongly recommended in all mega projects especially in marine climatic conditions and corrosion prone area.



  • It is to be noted that all over the world HDPE ducts are preferred over metallic ducts.
  • There is no difference in the basic prices of HDPE & Metallic Sheathing ducts.
  • In overall cost of the structure, approx. 10% of the total project cost is spent on prestressing work including material. The amount spent towards actual cost of sheathing duct is about 10% of the prestressing work and if HDPE ducts are costlier by few percentage over metallic, the over all cost impact is negligible.
  • It is also to be noted that if the lesser values of m & k in PE ducts are considered right from the designing stage, there would be substantial saving in steel.


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