Small Means of Containment (SMOC)

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:


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