BS PD CEN/TR 17236:2018 gives a list of constituents of interest proposed for measurement in the aerosol for the purpose of regulatory submission under the Directive 2014/40/EU (TPD) [2], for

prefilled products such as disposable e-cigarettes and refill cartridges,
e-liquids sold in refill containers,
the following categories of hardware: coils or other heater elements of the vaping product, atomisers, rebuildable atomisers and all open tank or dripper products with inbuilt atomisers, including clearomisers.

This list is not intended to be comprehensive but rather, it represents the default minimum requirement. Depending on the device/liquid combination and the toxicological assessment other substances might have to be measured as well.Cross References:2014/40/EUAFNOR XP D90-300-3BSI PAS 541152011/65/EUPAS 54115