We thought long and hard about the format of the pyro substance manufacture process. After taking advice re using assigned UN numbers we created the UNMAN2 concept.
The argument was that for absolute correctness any of the UN numbers with an NOS designation must also have a Technical Name shown on the certificate - for example "UN0476 Substance Explosive NOS, Flash Composition RD283"
On the face of it NOS appears to be a catch all listing but when used properly as UN model regulations and ADR etc state the full technical name must be shown.
The use of NOS has been problematic in explosives licencing with many administrators not grasping the need to include a Technical Name. An example has been for model rocket motors falling under UN0349 Articles Explosive NOS - without a technical name on the certificate the holder could lawfully acquire a vast range of explosive articles other than the model rocket motors he had originally had the certificate granted for.
An additional problem is that of assigning a HD or in storage an ER2014 HT. Assigned UN numbers all have an HD whereas our UNMAN2 is not HD or therefore HT specific.
Hope this answers your question.
Edited by exat808, 09 December 2016 - 11:57 AM.