What indicates a material's packing group on shipping papers?

The indication of a material's packing group on shipping papers is based on the degree of danger associated with the material, categorized into three groups: I, II, or III. Packing Group I signifies a high level of danger, Packing Group II indicates a medium level, and Packing Group III represents a lower level of danger. This classification helps shippers and transport personnel assess the risks posed by the hazardous materials during transportation and informs them of the necessary precautions and handling procedures.

Other factors such as viscosity, packaging size, and cost of shipping do not directly relate to the classification of materials into packing groups. Instead, they focus on different aspects of transport logistics and material properties, rather than the inherent danger level of the materials themselves.