Billing Code - PHMSA - Department of Transportation

pound) to include transportation by vessel.
capacity).
UN1950 Aerosols, corrosive, Packing Group II or III (each not exceeding 1 L
This new entry was inadvertently removed from the HMT due to an incorrect
amendatory instruction in a September 13, 2011 final rule (76 FR 56304; HM–244D). The
entry is being placed back into the HMT.
Removed HMT Entries
UN3492 Toxic by inhalation liquid, corrosive, flammable, n.o.s. with an
inhalation toxicity lower than or equal to 200 ml/m3 and saturated
vapor concentration greater than or equal to 500 LC50
UN3493 Toxic by inhalation liquid, corrosive, flammable, n.o.s. with an
inhalation toxicity lower than or equal to 1000 ml/m3 and saturated
vapor concentration greater than or equal to 10 LC50
These entries are removed from the HMT due to their similarity to UN3488 and
UN3489 respectively. The sole difference between these entries is the order of subsidiary
risks, which does not affect the classification and transport conditions applied to shipments
of these substances. As a result, PHMSA is removing identification numbers UN3492 and
UN3493 to avoid confusing shippers in determining which identification numbers to use.
Amendments to the column (1) symbols.
Section 172.101(b) describes column (1) of the HMT and the associated symbols
that may be indicated in the column. In accordance with § 172.101(b), the symbol “G”
identifies proper shipping names for which one or more technical names of the hazardous
material must be entered in parentheses in association with the basic description on a
23