Small MOC require certification marks showing UN (United Nations), TC (Transport Canada), or DOT (U.S. Department of Transport) symbols, depending on the type of container.
The certification must consist of:
1 . United Nations Certification Symbol
2. Packaging Codes
Below are the packaging codes (Type and Material of Package):
3. Packing Group
4. Maximum Allowable
The gross weight is in Kilograms when the packaging is a combination package. When shipped in single or composite packaging it is identified by relative density.
Relative Density or Specific Gravity
The ratio of the density (mass of a unit volume) of a substance to the density of the package test and certification. Specific gravity for liquids is nearly always measured with respect to water at its densest; for gases, the reference is air at room temperature.
If a substance’s relative density is less than 1 then it is less dense than the package test and certification, if greater than 1 then it is denser than the reference. If the relative density is exactly 1 then the densities are equal; that is, equal volumes of the two substances have the same mass. If the reference material is water, then a substance with a relative density (or specific gravity) less than 1 will float in water.
Here are examples of a UN Certification Mark: