What the label must say
Updated
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The signal word
When only a chronic hazard exists, the signal word WARNING shall be used. When an acute hazard signal word is also mandated, the acute one is used. Either way it shall be prominently visible and set in bold capitals, in a size equal to or greater than the statement of potential chronic hazards.
The hazards, in order
Potentially chronic hazards shall be stated substantially in accordance with the statements the rule lists, limited to those that are clinically significant and might be expected with any reasonably foreseeable use, and grouped in order of relative descending severity.
Name the components
All components and known decomposition products with a potential for chronic hazards shall be listed prominently. Generically equivalent names may be used, which is the one concession to formulation confidentiality in the labeling clause.
Safe handling instructions
Appropriate precautionary statements on work practices, personal protection and ventilation, substantially conforming to the list in the rule. That list includes "Keep container tightly closed when not in use", which is a packaging instruction in a labeling standard.
Sensitizers get their own list
Each label shall contain a list of the sensitizers present in sufficient amounts to contribute significantly to a known skin or respiratory sensitization. That is a separate requirement from the chronic hazard list and is often the one missed.
And a source for more information
The precautionary label shall contain a statement identifying a source for additional health information, substantially conforming to one of the phrases the rule provides. Where chronic labeling applies, a US address and telephone number are required too.
It must not weaken the acute warnings
Labeling shall conform to any labeling practices prescribed by federal and state statutes or regulations and shall not diminish the effect of required acute toxicity warnings. Chronic labeling is added to those, not traded against them.