Principles of safety: Laboratory workers are exposed to many hazards. In the laboratory, there are many chemicals which are toxic, flammable, explosive, corrosive and carcinogenic. The essence of chemical safety is comprised in four principles. 

• Every chemical is hazardous without exception 
• Every accident announces that it will happen before it happens 
• If it might happen, it will happen eventually 4) Each person is individually and personally responsible for the safe use of chemicals