m-pipe® has a permeation performance significantly better than pipes using other polymers. For example, tests with Hydrogen Sulphide at 17bar show permeation levels at least 100 times lower than PA11, PVDF and PE.
|Material||Temperature (°C)||Pressure Bar||Permeation coefficient Q(cm²/s/atm)||Diffusion coefficient D(cm²/s)|
|m-pipe®||155||17||6.2 x 10–9||6.5 x 10-8|
|m-pipe®||110||17||1.2 x 10-9||1.3 x 10-8|
|PVDF||100||-||1.3 x 10-6||---|
|PA 11||100||80||6.6 x 10-7||0.8 x 10-6|
|PA 6||30||-||0.3 x 10-8||5 x 10-10|
In addition, the presence of hydrocarbon mixtures has a minimal effect on the permation characteristics of m-pipe®. In other thermoplastics polymers, the hydrocarbon causes the polymer to swell, accelerating permeation and reducing the 'incubation' period before permeation begins.