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SewerPlex is a polyethylene fully welded joint system, designed to eliminate infiltration by storm and ground water, and tree root intrusion issues that were historically a common cause of failure in non-polymer sewer pipe systems.

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SewerPlex pipes and fittings are used for gravity sewer lines. The system virtually eliminates manholes and allows for both vertical and horizontal bends in sewers. Non-entry maintenance shafts are provided to permit jet-rodding of sewers to remove blockages whilst each property connection is made using an inspection, sediment trap.


SewerPlex is manufactured from polyethylene offering the following benefits:

  • House Connection include sediment trap to prevent mortar entering sewer during construction.
  • Polyethylene pipeline with fully welded joints to minimise root intrusion and stormwater ingress
  • Virtual elimination of personnel entry manholes.
  • Sewers may contain vertical horizontal bends to minimise the requirement for maintenance shafts
  • The toughness of polyethylene pipes eliminates the potential for pipe breakage due to land subsidence.
  • SewerPlex's light coloured inner surface facilitates CCTV inspection of sewers.
  • Full axial restraint which eliminates the need for thrust blocks
  • Low celerity material minimises water hammer
  • UV stability for above ground pipeline
  • Rust and corrosion free
  • Long length availability to minimise joints
  • Complete range of fittings
  • Weldable using butt and electrofusion methods
  • High ring stiffness for deeply buried pipeline
  • Excellent abrasion resistance
  • Possibility of 100+ year asset life
Material Options

Material Options

Mechanical Properties
Property Value & Unit
Density (Specific Gravity) 955kg/m2
Yield Strain 10%
Yield Stress 25MPa
Compressive Strength 32MPa
Tensile Modulus 900MPa
Hardness Shore D 63
Poisson’s Ratio 0.4
Ring bending modulus (3 mins) 950MPa
Ring bending modulus (50 yrs) 260MPa
Thermal Properties
Property Value & Unit
Coefficient of Thermal Expansion 1.8 x 10-4/°C
Thermal Conductivity 0.38W/m.K

Typical Fire Resistance Properties

Property Value & Unit
Ignitability 13
Smoke Development 3
Spread of Flame 7
Heat Evolved 6
Temperature Effect On Pressure Rating

The co-efficient thermal linear expansion of polyethylene varies with temperature but at ambient lies in the range 1.2 to 2.4 x 10-4 per degree C. In broad terms, this is about twenty times that of steel and therefore unrestrained pipe will expand or contract much more than the steel structure that may be supporting it.

Should the pipe be fully restrained, the strain due to thermal change will generate stress in the material. However, due to the relatively low tensile deformation modulus of polyethylene and assuming a typical ambient temperature fluctuation of less than 40°C, it can be assumed that the safe allowable stress will not be exceeded. Over the longer term, stress relaxation will increase the ability of polyeth­ylene to accommodate high thermal strains.

The conductivity of polyethylene varies with temperature almost linearly and is typically 0.47 W/m.K at 0°C to 0.37W/m.K at 70°C.

The specific heat of polyethylene varies with temperature from 1800 Joules/kg.K at 0°C to 2200J/kg.K at 60°C.

All temperatures above 25°C it is necessary to re-rate polyethylene pressure pipe systems. The table below provides guidance as to the maximum operating pressure of PE100 pipes at temperature. It should be noted that at constant temperatures greater than 40°C. the 50-year design life of POLlplex® pipes may be reduced.


Thermal rerating of PE100 polyethylene POLIplex® pipe
Maximum allowable operating pressure - PE100 Water pipe (m head)

Temp°C PN4 PN6.3 PN8 PN10 PN12.5 PN16 PN20 PN25
20 40 63 80 100 125 160 200 250
25 36 58 73 91 115 145 182 227
30 36 58 73 91 115 145 182 227
35 33 53 67 83 106 133 167 208
40 33 53 67 83 106 133 167 208
45 (35 y)* 31 49 62 77 99 123 154 192
50 (22 y)* 29 46 57 71 91 114 143 179
55 (15 y)* 29 46 57 71 91 114 143 179
60 (7 y)* 27 43 53 67 85 107 133 167
80 (1 y)* 20 32 40 50 63 80 100 125

i. The values tabled are for POLlplex® pipe manufactured to AS/NZS 4130 and fittings made from compounds complying with AS/NZS 4131.

PE100 Material Composition

The PE100 polyethylene resin used in POLIplex pipes and fittings are pre-compounded, either black or coloured with pigment, complying with AS/NZS 4131. Anti-oxidants are used to inhibit oxidation of the polymer at the compounding stage and during subsequent processing.

Carbon black is used in all black POLIplex pipe at a concentration of 2.25 ± 0.25% by mass as an ultra violet radiation absorber.

In natural and coloured POLIplex materials, hindered amine light stabiliser (HALS), ultra violet absorber. is used in lieu of carbon black.

Chemical Resistance

Polyethylene is a polyolefin resin, in chemical terms a non-polar high molecular weight paraffin of the hydrocarbon family. Hence it is very resistant to (non-oxidising) strong acids, strong bases and salts. It is mildly affected by aliphatic solvents although aromatic and chlorinated solvents will cause some swelling. Polyethylene is affected by strongly oxidising substances such as halogens and concentrated inorganic acids. POLIplex® pressure pipes should not be used to convey water disinfected with chlorine dioxide at any temperature which has been found to rapidly deplete the antioxidant additives at elevated temperature.

View the Iplex Chemical Resistant Tool

Product Details

Product Details

Standards and Approvals

SewerPlex is manufactured to AS/NZS 4130 from resin compounds complying with AS/NZS 4131 and are StandardsMark licensed to AS/NZS 4130 by third-party certifier SAI Global.

View Iplex Product Certifications

Colour and Markings

Poliplex pipes are co-extruded with a black external skin (with grey stripes) and natural (cream) internal surface.

SewerPlex Joining Systems

SewerPlex pipe and fittings are joined using the electrofusion process. Iplex offer a full range of SewerPlex fittings:

  • Couplings
  • Caps
  • Sweep junction
  • Sweep Bends
  • Puddle Flanges
  • Backdrops
  • Maintenance Shaft Drops
  • Saddles
  • Sediment Traps
SewerPlex Pipe Range and Dimensions
Environmental Credentials

Iplex has published verified Environmental Product Declaration (EPD) on our range of Polyethylene pipes. EPD’s are third party certified documents based on ISO 14025 and EN 15804 Standards that communicate transparent and comparable information about the life-cycle environmental impact of a product or service. Specifically, product declarations include information on the environmental impact of raw material acquisition, energy use and efficiency, composition of materials and chemical substances, emissions to air, soil and water and waste generation.

View Iplex's Poliplex® polyethylene pipe EPD

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