Billing Code - PHMSA - Department of Transportation

minimum marking size requirements for cylinders of 60 liters water capacity or less.
PHMSA agrees that cylinder markings have historically been allowed provisions that
would allow for smaller UN number markings than other non-bulk packages and is
providing an exception for cylinders of 60 liters water capacity or less consistent with the
recent UNSCOE exception.
Therefore, with the aforementioned transition period, exceptions, and note,
PHMSA is specifying a marking size consistent with package marking sizes adopted in the
17th Revised Edition of the UN Model Regulations.
Section 172.312
Section 172.312 details the specific marking requirements for liquid hazardous
materials in non-bulk packagings. Paragraph (a) of this section describes scenarios when
package orientation arrows must be displayed on the outside of a package. Provided
certain criteria are met, paragraph (c) excepts certain shipments from the requirements of
paragraph (a) and thus, the requirement to display the package orientation arrows on the
package. Currently § 173.312(c)(3) states that when offered or intended for transportation
by aircraft, packages containing flammable liquids in inner packagings of 120 mL (4 fluid
oz.) or less prepared in accordance with § 173.150 (b) or (c) of this subchapter when
packed with sufficient absorption material between the inner and outer packagings to
completely absorb the liquid contents are not required to display the package orientation
arrows on the outside of the package. The ICAO TI have been amended to extend this
exception to the package orientation markings to all liquid hazardous materials in inner
packagings of 120 mL (4 fluid oz.) when packed with sufficient absorption material
between the inner and outer packagings to completely absorb the liquid contents. PHMSA
70