Dealing with substances formed in situ in materials, e.g. due to reactions in
manufacturing processes
These situations are anticipated to be relatively uncommon. But unless specifically exempted,
such substances when listed in GADSL should be considered to be declarable if they exceed the
content threshold. Their presence may be known and quantified because of notifications from
upstream suppliers, or via analytical investigations linked to product stewardship considerations
(see note below). An example relevant to the automotive sector would be the case of chlorinated
dibenzodioxins (dioxins) which can be formed at trace concentrations during material
processing. Note: It is not expected that suppliers necessarily perform routine analyses for the
presence of GADSL listed substances.