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Home  > Raw materials & technologies  > Applications  > Protective & Marine coatings  > New lab test method determines leaching data

Monday, 16 September 2019
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Raw materials & technologies, Applications, Protective & Marine coatings

New lab test method determines leaching data

Monday, 7 January 2013

Raindrops crash against buildings. Facade coatings protect the concrete. But it is well known that the emission of chemistry into the water takes place in this moment. Now you can collect this data.

A leaching laboratory test method has been developed

Source: Fotolia/Gerhard Giebener

A leaching laboratory test method has been developed

Source: Fotolia/Gerhard Giebener

Façade coatings are exposed to weathering. Driving rain events can cause façade runoff bearing the potential to release substances from the coating. The analysis of dry films does not reveal reliable leaching data. The leaching is diffusion controlled and correlates with physico-chemical parameters.

In order to derive reliable and reproducible information about this  leaching (emission into water), a laboratory test method has been developed, that has been published as European Standard EN 16105:2011.

An interlaboratory comparison has been performed with eight participants in order to validate the test method. Ute Schoknecht from BAM (Federal Institute for Materials Research and Testing) and colleagues also from Dr. Robert-Murjahn-Insitute GmbH, both in Germany describes the test results that reveal statistics on the quality of the test method and allows further insights to the leaching mechanism in coatings.

EN 16105 is reproducible between laboratories and repeatable within laboratories.

This development is now published in Progress in Organic Coatings, Volume 76, Issues 2–3, February–March 2013, Pages 351–359.

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