Small Quantities of Compressed Gas

Small quantities of compressed gas such as a starter fluid (Class 2.1) or fire extinguisher (Class 2.2) installed on a vehicle do not take precedence over the flammable liquid Class 3.

If required, classify other hazardous materials not identified above according to 49 CFR 173.2a.

For hazard classification of Class 5.2 organic peroxides, refer to A4.2.6.

A4.3 provides information on determining the degree of hazard for selecting the proper Packing Group. For most hazardous materials, the Packing Group is assigned in Column 5 of Table A4.1 Packing Groups (PG) I, II, and III indicate the degree of hazard associated with the materials (PG I-high danger, PG II- medium danger, PG III- low danger). They are also used to identify the severity of UN specification performance tests associated with the item's packaging.

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