Migration modelling as a predictive tool for drinking water quality

Teppfa recently initiated a project to develop a predictive tool to provide comprehensive lifetime migration data, which results in time-saving compared to the traditional methods. Scientific evidence from the last 60 years shows that diffusion in and migration from homogeneous plastic materials in (drinking) water can be predicted with a good accuracy by using appropriate theoretical models. It is scientifically accepted that the mass transport equations given by Fick almost 150 years ago can be applied to the migration from plastics into water!

The end result of this project will be a comprehensive databank of migration parameters, acquired by experiments, and a calculation method. This allows the calculation of migration parameters from the chemical structure using only measurement of the concentration of the substance in the polymer and parameters from the databank. Also the prediction of migration over time at different temperatures will be possible.

Up to now the modelling method is validated. The final phase of the project is initiated to extend the number of migrating substances and widen the dBase for pipe materials PE (PEX), PP and PB. Discussions are in progress with national regulatory bodies in the EU to share the results and gain their support for acceptance.

The finished tool will not only help us to promote the hygienic advantages of plastics in support of drinking water quality, but the data will also help to focus further on developments in raw materials and additives.