Risk Phrases (R) and Safety Phrases (S) is an important part of Chemical MSDS and Safety data sheet. We can identify hazard of a chemical by this phrases. Hazard classification should be indicated with hazard signs and hazard symbols and/or R phrases as well as S phrases. R phrase and R number: phrases indicating the risks of hazardous preparations and substances, and their numbers respectively. S phrase and S number: phrases related to the safe handling of hazardous preparations, and their numbers respectively.