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UN classifications appear on industrial packaging as a long series of letters, numbers and symbols. This marking is permanent and the UN classification explains what materials or substances the barrel is certified to transport. For an industrial storage barrel, for example, the classifications refer to the following:
The tests carried out
To obtain UN certification, each product must pass very rigorous testing. Here are some basic tests:
This test involves dropping a barrel in free fall from all sides (top, bottom, side, corner, etc.). All deformations and leaks are noted.
This test consists of determining the compressive strength of a barrel under constant weight for a period of time.
This test evaluates the resistance to vibration when moving. The barrels are placed on a vibrating plate which simulates a transport.
This test determines the maximum internal pressure that the barrel can experience. The barrel is filled with water to capacity and maintains constant pressure for few minutes.