Class 3: Flammable liquids – Packing Group
Flammable liquids are grouped for packing purposes according to their flashpoint, their boiling point, and their viscosity. Below table shows the relationship between flashpoint and boiling point
Viscous substances such as paints, enamels, lacquers, varnishes, adhesives and polishes having a flashpoint of less than 23 °C may be placed in packing group III in conformity with the procedures prescribed in part III, chapter 32.3, of the United Nations Manual of Tests and Criteria on the basis of:
.1 the viscosity, expressed as the flowtime in seconds;
.2 the closed-cup flashpoint;
.3 a solvent separation test.
Viscous flammable liquids such as paints, enamels, varnishes, adhesives and polishes with a flashpoint of less than 23 °C are included in packing group III provided that:
.1 less than 3% of the clear solvent layer separates in the solvent separation test;
.2 the mixture or any separated solvent does not meet the criteria for class 6.1 or class 8.
.3 the viscosity and flashpoint are in accordance with the following table:
.4 the capacity of the receptacle used does not exceed 30 ℓ.
Substances classified as flammable liquids due to their being transported or offered for transport at elevated temperatures are included in packing group III.