Coating & Linings

All Electrosteel pipework is coated and lined with fully approved materials to meet all major and relevant standards for water and sewerage. Our coatings and linings ensure the longevity of pipework installed both underground and above-ground.

Internal Protection for Pipes and Fittings

Our ductile iron pipes are internally lined with cement mortar linings, these linings create a high pH environment at the pipe wall which protects the pipe from corrosion and tuberculation.

  • Blast Furnace Slag Cement
  • High Alumina Cement (Wastewater applications)


Potable Water Applications:

For the transportation and supply of potable drinking water Electrosteel line the pipes with a Blast Furnace  Cement  used in accordance with BS EN 197-1. This option is seen as a 'greener' solution than the use of OPC.
The use of Electrosteel pipes lined with Blast Furnace cement are approved for use with drinking water by the Secretary of State through the DWI.
In certain conditions the use of an additional 'seal' coat applied to the lining may be required.In areas with very soft water, or high residence, a further epoxy ‘seal’ coat is applied. These coatings are in accordance with BS EN 545:2010 and are also approved by the Secretary of State through the DWI.

Wastewater & Sewer Applications:

For wastewater and sewer applications where the line may convey aggressive effluents Electrosteel ductile iron pipes are internally lined with a High Alumina Cement (HAC) to allow for operating conditions ranging from pH4 to pH12 and at temperatures upto 20'C.

The High Alumina Cement (HAC) lining is in complies with EN598.


Portland Cement

Blast Furnace

High Alumina 

Min value of pH
Max content (mg/L) of CO2
Sulphates (SO4)
Magnesium (Mg++)
Ammonium (NH4+)
no limit
no limit
no limit
no limit



External Protection for Pipes & Fittings

Electrosteel provide a range of external protection systems for the pipes and fittings within the range. 

Pipe Protection

All pipes regardless of diameter are offered with; 
  • Zinc Aluminium coatings having a minimum mass of 400g/m2
  • Zinc coating having a minimum mass of 200g/m2 or 400g/m2
  • The above is subsequently coated with a top coat of either blue/red epoxy or where still required with a bitumen coat.

In more aggressive soil conditions a range of additional protection systems are available including the application of bitumen impregnated tape wrappings and our recent addition of external PU coatings


Soil Corrosively

Typical Ground Conditions (pipes)

Protection System (pipes)

Slight to moderately aggressive

  • Soil resistivity above 2500
  • Soil resistivity between 1500 and 2500 without table water
Zinc (130 to 200gms/m2 minimum)with Bitumen or Epoxy top coat


  • Soil resistivity between 1500 and 2500 with water table
  • Soil resistivity between 500 and1500 without water table
Zinc-Aluminium (400gms/m2) with Epoxy top coat


Zinc (200gms/m2 min.) with
Bitumen or Epoxy as top coat and PE sleeving recommended in this instance.

Highly Aggressive

  • Soil resistivity below without water table
  • Soil resistivity below with water table
  • Ground with light chemical contamination
  • Stray electrical currents
As per coating for aggressive soils plus Tapewrap (25mm overlap)


Polyurethane coating (Min. 750 micron)

Special Condition

  • Ground containing clinker, bricks, flints etc.likely to cause mechanical damage.
  • Ground with heavy chemical contamination
  • Tidal water e.g. estuaries, shorelines
As per coating for aggressive soil plus Tapewrap (55% overlap)


Polyurethane coating (min. 1000 micron)

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Electrosteel Castings (UK) Ltd, Ambrose Yard, Broombank Trading Estate, Broombank Road, Chesterfield, Derbyshire S41 9QJ
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