• Shippers must ensure that the packaging used for dangerous goods will not be affected or weakened by contact with the dangerous goods, or otherwise compromised by things such as chemical reactions, temperatures during transport, and more

Parts of packagings that are in direct contact with dangerous goods:

• Must not be affected or weakened by the dangerous goods;
• Must not cause a dangerous effect, catalyze, or react with the dangerous goods; and
• Must not allow permeation of the dangerous goods that could create a danger under normal conditions of transport.

Where necessary, the packagings must include a suitable inner coating or treatment.

Shippers must also ensure that absorbent materials and the materials of intermediate packagings for liquids do not react dangerously with the liquid.

Materials may not be used if they can be significantly softened or rendered brittle or permeable:

• By temperatures experienced during transport, or
• Because of the chemical action of the contents, or
• From the use of a refrigerant.

While certain packagings are specified in individual packing instructions, it is the responsibility of the shipper to ensure that all packagings are in every way compatible with the articles or substances contained in those packagings. Pay particular attention to the following:

• The effect of fluorine on glass,
• The effects of corrosion on metals such as steel and aluminum, and
• The interaction of substances with polymer materials.

Shippers must:

• Ensure that packagings used are compatible with the dangerous goods to be transported, and
• Provide evidence of those measures or assessments when requested.