Back Restrain


Iplex pipeline has developed RestrainTM PVC-U sewer pipe is specifically for gravity sewer applications utilising trenchless techniques for the installation, repair or replacement of underground infrastructure. RestrainTM is a rubber ring jointed PVC-U pipe,with a threaded spigot and socket, which provides immediate axial capability during installation.

Material Properties

Mechanical Properties
Property Value & Unit
Density 1530 kg/m3
Ultimate Tensile Strength 52MPa
Compressive Strength 66MPa
Ring Bending Modulus (3min) 3200MPa
Ring Bending Modulus (50 yr) 1400MPa
Hardness (Shore D) 85 (ASTM D2240)
Yield Strain 5.5%
Poisson's Ratio 0.38
Thermal Properties
Property Value & Unit
Max Continuous Service Temperature 50°C
Specific Heat 1045 J/kg/°C
Thermal Conductivity 0.138-0.150 W/m/°C
Coefficient of Thermal Expansion 7 x 10-5 / °C
Vicat Softening Temperature Approx. 80°C

PVC-U pipe is non-conductive and cannot be used for earthing electrical equipment.

Property Value & Unit
Volume Resistivity 1016 (60% RH)
Surface Resistivity 1013 - 1014 ohm
Power Factor (at 20°C) 0.015 - 0.020
Dielectric Constant (at 25°C) 3.4 - 3.6 (60 Hz)
Temperature Effects

PVC-U pipe is suitable for service temperatures between 0°C and 50°C, it's self-extinguishing and does not support combustion when the source of ignition is removed.

PVC-U pipe should not be used for continuous service temperatures above 50°C, as deformation of the pipe may result.

Impact Strength

PVC-U sewer pipes have good impact resistance, however at very low temperatures (eg. Below 5°C) the impact resistance of PVC-U pipes is reduced. Hence, when installing pipes at low temperatures extra care should be taken when handling and inserting.

PVC-U pipes are however installed in some of the coldest regions of Europe and North America in large quantities without difficulty.

Chemical Resistance

PVC-U sewer pipes have high resistance to a wide range of chemical reagents. Such resistance, however, is a function of temperature, concentration and pressure.

In general, PVC-U is suitable to convey strong acids, alkalis and aqueous solutions (except those which are strongly oxidising), aliphatic hydrocarbons, fluorides, photographic and plating solutions, brine, mineral oils, fats and alcohols. The suitability of a pipeline for conveying a certain chemical will depend on such factors as the concentration of the chemical in the fluid to be conveyed, temperature, flow rate, the presence of pockets or "dead spots" in the pipeline and other factors.

RestrainTM sewer pipes should not be used with aromatic or chlorinated hydrocarbons, ketones, esters and ethers.

View the Iplex Chemical Resistant Tool