HAZMAT Class 6 Toxic and Infectious Substances - Packing Groups

Packing Groups

Class 6 Packing Groups and Hazard Zones
The packing group of Division 6.1 materials shall be as assigned in Column 5 of the 49CFR 172.101 Table. When the 49CFR 172.101 Table provides more than one packing group or hazard zone for a hazardous material, the packing group and hazard zone shall be determined by applying the following criteria:

1. The packing group assignment for routes of administration other than inhalation of vapors shall be in accordance with the following table:

Group Oral Toxicity
LD50 		Dermal Toxicity
LD50 		Inhalation Toxicity
(Dust/Mist)
LC50
I
II but but but
III solids: but
liquids: but 		but but

2. The packing group and hazard zone assignments for liquids (see 49CFR 173.115(c) of this subpart for gases) based on inhalation of vapors shall be in accordance with the following Table:

Packing Group Hazard Zone Vapor Concentration and Toxicity
I A ; .
I B ;

The criteria for Packing Group I. Hazard Zone A are not met.
II C ;

The criteria for Packing Group I, Hazard Zones A and B are not met.
III D ;

The criteria for Packing Groups I and II, Hazard Zones A, B and C are not met.
Note 1: V is the saturated vapor concentration in air of the material in at 20°C and standard atmospheric pressure.

Note 2: A liquid in Division 6.1 meeting criteria for Packing Group I, Hazard Zones A or B stated in paragraph (a)(2) of this section is a material poisonous by inhalation subject to the additional hazard communication requirements in 49CFR 172.203(m)(3), 49CFR 172.313 and Table 1 of 49CFR 172.504(e) of this subchapter.
These criteria are represented graphically in Figure 1:

3. When the packing group determined by applying these criteria is different for two or more (oral, dermal or inhalation) routes of administration, the packing group assigned to the material shall be that indicated for the highest degree of toxicity for any of the routes of administration.

4. Notwithstanding the provisions of this paragraph, the packing group and hazard zone of a tear gas substance is as assigned in Column 5 of the 49CFR 172.101 Table.
The packing group and hazard zone for Division 6.1 mixtures that are poisonous (toxic) by inhalation may be determined by one of the following methods:
Where data is available on each of the poisonous (toxic) substances comprising the mixture:
1. The of the mixture is estimated using the formula:
  • where = mole fraction of the component of the liquid
  • = means lethal concentration of the component substance in
2. The volatility of each component substance is estimated using the formula:
where: = partial pressure of the component substance in kPa at 20°C and one atmospheric pressure. may be calculated according to Raoult's Law using appropriate activity coefficients. Where activity coefficients are not available, the coefficient may be assumed to be 1.0.
3. The ratio of the volatility to the LC50 is calculated using the formula:
4. Using the calculated values LC50 (mixture) and R, the packing group for the mixture is determined as follows:
Packing Group Hazard Zone Ratio of Volatility and LC50
I A and
I B and ; and

The criteria for Packing Group I, Hazard Zone A, are not met.
II C and ; and

The criteria for Packing Group I, Hazard Zones A and B are not met.
III D and ; and

The criteria for Packing Groups I, Hazard Zones A, B and Packing Group II.

In the absence of LC50 data on the poisonous (toxic) constituent substances, the mixture may be assigned a packing group and hazard zone based on simplified threshold toxicity tests. When these threshold tests are used, the most restrictive packing group and hazard zone must be determined and used for the transportation of the mixture.

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