EN ISO 23649:2025 PDF

This document specifies a method for determining the total content of the following cyclosiloxanes in chemicals for the leather tanning industry: — octamethylcyclotetrasiloxane (D4); — decamethylcyclopentasiloxane (D5); — dodecamethylcyclohexasiloxane (D6); This method requires the use of gas chromatography (GC) equipped with a single quadrupole mass spectrometer (MS) to identify and quantify the cyclosiloxanes.