Are there exceptions to the poisonous by inhalation marking requirement of § 172.313?
A. Yes. Under Docket HM-206, an exception was provided in § 172.313(a) from marking the words “Inhalation Hazard” on a package containing a material poisonous by inhalation, provided the words appear on the new POISON INHALATION HAZARD (PIH) label and placard. Although voluntary compliance is authorized, mandatory compliance for use of the new PIH label and placard, respectively, is October 1, 1999 and October 1, 2001.