Outage or Ullage - The amount by which a packaging falls short of being liquid full, usually expressed
in percent by volume.
Outer Packaging - The outermost enclosure of a composite or combination packaging together with any
absorbent materials, cushioning and any other components necessary to contain and protect inner
Overpack - An enclosure used by a single consignor to provide protection or convenience in handling of
a package or to consolidate two or more packages. Overpack does not include a freight container.
Package or Outside Package - A packaging plus its contents.
Packaging - A receptacle and any other components or materials necessary for the receptacle to perform
its containment function.
Packers - Personnel who package hazardous materials, but do not sign legally binding documents.
Packing Group - A grouping according to the degree of danger presented by hazardous materials.
Packing Group I, indicates great danger; Packing Group II, medium danger; Packing Group III, minor
PCB(s) - Polychlorinated Biphenyls. A series of compounds used for a number of industrial purposes
which are now found throughout the natural environment. PCBs are toxic to some marine life at
concentrations of a few parts per billion (ppb) and are known to cause skin diseases, digestive
disturbances, and even death in humans at higher concentrations. PCBs are persistent in the environment
and do not easily decompose, and biomagnify up the food chain.
pH - A value taken which represents the acidity or alkalinity of an aqueous solution. It is defined as the
logarithm of the reciprocal of the hydrogen ion concentration of a solution.
Primary Hazard - The hazard class of a material as assigned in the Title 49 CFR 172.101.
Proper Shipping Name - The name of the hazardous material shown in Roman print (not italics) in Title
49 CFR 172.101.
Receptacle - A containment vessel for receiving and holding materials, including any means of closing.
Reportable Quantity - (RQ) The quantity specified in column 3 of the table in Title 49 CFR 172.101,
Appendix A for any material identified
Residue - The hazardous material remaining in a packaging, including a tank car, after its contents have
been unloaded to the maximum extent practicable and before the packaging is either refilled or cleaned of
hazardous material and purged to remove any hazardous vapors.