SDS Studio™Definition: An EC number is the seven-digit EU identifier of a substance in the form 200-578-6, taken from the EINECS, ELINCS or NLP lists or assigned by ECHA.
EC numbers starting with 2 or 3 come from EINECS (existing substances), with 4 from ELINCS (notified new substances) and with 5 from NLP. Numbers starting with 6, 7, 8 or 9 are list numbers assigned by ECHA and are not official EC numbers.
SDS section 3 lists the EC number with the CAS and REACH registration number of each disclosed ingredient.