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[Rowyrow]

Dunno if this helps

UN number
From Wikipedia, the free encyclopedia

UN numbers or UN IDs are four-digit numbers that identify hazardous substances, and articles (such as explosives, flammable liquids, toxic substances, etc.) in the framework of international transport. Some hazardous substances have their own UN numbers (e.g. acrylamide has UN2074), while sometimes groups of chemicals or products with similar properties receive a common UN number (e.g. flammable liquid, not otherwise specified, have UN1993). A chemical in its solid state may receive a different UN number than the liquid phase if their hazardous properties differ significantly; substances with different levels of purity (or concentration in solution) may also receive different UN numbers.

UN numbers range from UN0001 to about UN3500 and are assigned by the United Nations Committee of Experts on the Transport of Dangerous Goods. They are published as part of their Recommendations on the Transport of Dangerous Goods, also known as the Orange Book. These recommendations are adopted by the regulatory organization responsible for the different modes of transport.

For more details, see List of UN Numbers.

NA numbers (North America), also known as DOT numbers are issued by the United States Department of Transportation and are identical to UN numbers, except that some substances without a UN number may have an NA number. These additional NA numbers use the range NA8000 - NA9999.

Associated with each UN number is a hazard identifier, which encodes the general hazard class and subdivision (and, in the case of explosives, their compatibility group). For instance, the hazard identifier of acrylamide is 6.1 and the one of cigarette lighters is 2.1. If a substance poses several dangers, then subsidiary risk identifiers may be specified. It is not possible to deduce the hazard class(es) of a substance from its UN number: they have to be looked up in a table.

If you do do your own wikipedia search on un numbers and look up UN 3077 you will find it is a general number used for Environmentally hazardous substance, solid, n.o.s. (not including waste) of class 9

[RosalieM]

UN (United Nations) numbers are a universally recognised identification system for dangerous goods. They are for individual substances or groups of substances with very similar properties. That's why 2 products can have the same number. Depending on the properties, one chemical may have 2 UN numbers depending on its state (solid, liquid, gas). CAS numbers, however, are specific to each chemical/substance.

[RosalieM]

Good answer Rowyrow. Guess I took a while to write mine as yours wasn't there when I started! That's what happens when you write a few words here and there in between doing other things...

[cactus155]

Thanks for clearing that up for me