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Risk and Safety Statements, also known as R/S statements, R/S numbers, R/S phrases, and R/S sentences, is a system of hazard codes and phrases for labeling dangerous chemicals and compounds. The R/S statement of a compound consists of a risk part (R) and a safety part (S), each followed by a combination of numbers. Each number corresponds to a phrase. The phrase corresponding to the letter/number combination has the same meaning in different languages—see 'languages' in the menu on the left.

Until 2015 the risk and safety statements will be replaced by hazard statements and precautionary statements in the course of harmonising classification, labelling and packaging of chemicals by introduction of the UN Globally Harmonized System of Classification and Labelling of Chemicals (GHS).

Example

The R/S statement code for fuming hydrochloric acid (37%):

R: 34-37 S: 26-36-45.

The corresponding English language phrases:

Risks
R: 34 Causes burns
R: 37 Irritating to the respiratory system.
Safety
S: 26 In case of contact with eyes, rinse immediately with plenty of water and seek medical advice.
S: 36 Wear suitable protective clothing.
S: 45 In case of accident or if you feel unwell, seek medical advice immediately (show label where possible).

Dashes separate the phrase numbers. They are not to be confused with range indicators.

Example: R: 34-37 Causes burns, irritating to the respiratory system.

Slashes indicate fixed combinations of single phrases.

Example: R: 36/37/38 Irritating to eyes, respiratory system and skin.

More detailed hazard and safety information can be found in the material safety data sheets (MSDS) of a compound.

See also

External links

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Simple English

Risk and Safety Statements are codes that show the hazards of certain chemicals. There are certain R (risk) phrases and S (safety) phrases. For example, R34 states that the chemical may cause burns. S36 says to wear protective clothing.

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