<P> For more details, see Lists of UN numbers . </P> <P> NA numbers (North America), 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 NA 9000 - NA 9279 . There are two exceptions NA 2212 is all asbestos with UN 2212 limited to Asbestos, amphibole amosite, tremolite, actinolite, anthophyllite, or crocidolite . The second exception is NA 3334 is self - defense spray, non-pressurized with UN 3334 being aviation regulated liquid, not otherwise specified . Here are more exceptions: NA / UN exceptions </P> <P> For more details see List of NA numbers . </P> <P> ID numbers are a third type of identification number used for hazardous substances . Substances with an ID number are associated with proper shipping names recognized by the ICAO Technical Instructions . There is only one substance that currently has such a number: ID 8000, Consumer commodity . This substance does not have a UN or NA number, and is classed as a Class 9 hazardous material . </P>

When is a un number required on a placard