Sewerplex
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.
Material Properties
| Property | Value & Unit |
| Density (Specific Gravity) | 955kg/m3 |
| 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 |
| 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 |
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.
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.