Labelling of chemicals is highly regulated. This is because of the potential danger to humans and the environment. Labelling for chemicals needs to be clear, concise & not fade or drop off over time. They need to remain legible and intact over a long period of time so that there is never a doubt as to what is contained in the container or drum.
In the Hazard Label product section, the CLP & GHS regulations are covered in a bit more detail, the main point being that there is a globally recognised standard of label symbols & colours that are used. There are two main types, labelling of the product itself and labels used for the transportation (i.e. the outer packaging).
In the Waterproof & Chemical Resistant Labels section, the BS5609 standard is explained. This is to do with the performance of the label and the print in the marine environment. Any chemical substance being recovered from the sea needs to have a clearly legible label remaining on it.