GHS labels communicate chemical hazards through a set of standardized elements. Three of the most important text elements are the signal word, hazard statements and precautionary statements. They are linked to the product's hazard classification and should be read together rather than as separate warnings.
Signal words show relative hazard severity
The GHS uses two signal words: Danger and Warning. When a signal word is assigned, Danger is used mainly for more severe hazard categories and Warning mainly for less severe categories. If Danger applies, Warning should not also appear for that label information. Some hazard classifications do not use a signal word, so the absence of one does not by itself mean that a product has no hazards.
Hazard statements describe the hazard
A hazard statement is a standardized phrase assigned to a hazard class and category. It describes the nature of the hazard and, where appropriate, its degree. Examples include statements about flammability, acute toxicity, corrosion, serious eye damage or longer-term health effects. A product may carry more than one hazard statement when more than one classification applies.
H-codes are reference codes, not replacement text
GHS hazard statements are associated with codes beginning with H, such as Hxxx codes in Annex 3. These codes are intended for reference and data handling. They are not part of the hazard-statement wording and should not replace the actual statement text on a GHS label where the text is required.
Precautionary statements describe recommended protective measures
A precautionary statement describes measures recommended to minimize or prevent adverse effects from exposure, improper handling or improper storage. Under the GHS, precautionary statements are organized into five types: General, Prevention, Response, Storage and Disposal.
P-codes identify precautionary statements
Precautionary statements use reference codes beginning with P. The first number indicates the type: P1xx for general statements, P2xx for prevention, P3xx for response, P4xx for storage and P5xx for disposal. As with H-codes, P-codes are reference identifiers and should not replace the full precautionary statement text where that text is required.
Classification determines which statements appear
The label elements are not selected by appearance or preference. They are allocated from the product's hazard classification. A chemical or mixture classified in several hazard classes may therefore need multiple hazard statements and precautionary statements. Precedence and combination rules can reduce unnecessary repetition while preserving the required hazard information.
Read the signal word and statements together
The signal word gives a quick indication of relative severity, the hazard statements explain what the classified hazards are, and the precautionary statements explain recommended measures for safer handling, response, storage or disposal. A signal word alone does not describe the full risk, and a precautionary statement alone does not explain why the measure is needed.
Local rules determine the enforceable label
The United Nations GHS is a model framework. Countries and regions adopt it through their own laws and may use different GHS revision levels or implementation details. For example, OSHA's U.S. Hazard Communication Standard requires classified hazardous-chemical labels to include the applicable signal word, hazard statements, pictograms and precautionary statements along with the product identifier and responsible-party information.
Practical label check
When reviewing a chemical label, confirm the product identity first. Then read the pictograms, signal word, every hazard statement and every precautionary statement. Use the Safety Data Sheet for fuller hazard and control information, and follow the requirements that apply to the relevant workplace and jurisdiction.
