An extended SDS is a document of chemical safety.
It is much longer and detailed than the standard SDS.
It consists of a standard SDS which has more subsections than the general one, and an additional annex containing one or more exposure scenario(s).
The 1907/2006/EC REACH prescribes that those substances, which: exposure scenarios have to be prepared.
The descriptor system is created by ECHA for the use in exposure scenarios and in extended safety data sheets E-SDS Several type of descriptors is available.