7.4 Mandatory signs
Mandatory signs are round. White symbol on a blue background. Usually accompanied by an explanatory text. Examples are listed below.
 | Eye protection must be worn |
 | Hearing protection must be worn |
 | Respiratory protection must be worn |
 | Face protection must be worn |
 | Protective clothing must be worn |
 | Fire door - Keep closed |
 | Secure gas cylinders of all sizes, whether empty or full |