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Modelling biocide release from architectural coatings

TIMOTHY P. WANGLER
ETH Zürich Institute for Technology in Architecture Wolfgang-Pauli-Strasse 15 Zürich, 8093, SwitzerlandEmpa Swiss Federal Laboratories for Materials Science and Technology, Laboratory for Building Science and TechnologyÜberlandstrasse 129 Dübendorf, 8600, Switzerland

Abstract

Biocides are a necessary component of architecturalcoatings, extending their service lives by preventingmicrobial defacement. However, they have thepotential to enter surface waters in runoff from buildingfaçades during driving rain events. Increased regulationnecessitates a closer look at the release process, bothfor proper source input estimations for regulators, andproduct development insights for producers. The maturefi eld of controlled release offers a vast information store ofresearch that can be applied to this particular problem,with adjustments made for problem-specifi c conditionssuch as how wind driven rain leads to façade runoff.


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