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If you see this marking, it is identifying a hazardous material and its general characteristics towards safety.

 

 
 Health Hazard
   4 - Deadly
   3 - Extremely Hazardous
   2 - Hazardous
   1 - Slightly Hazardous
   0 - Normal Material		  Fire Hazard
   Flash Points
   4 - Below 73 F
   3 - Below 100 F
   2 - Below 200 F
   1 - Above 200 F
   0 - Will not burn
 Reactivity Hazard
   4 - May Detonate
   3 - May Detonate with
        Heat or Shock
   2 - Violent Chemical Change
   1 - Not Stable if Heated
   0 - Stable		 Specific Hazard
   OXY - Oxidizer
   ACID - Acid
   ALK - Alkali
   COR - Corrosive
   W - Use No Water
    - Radiation Hazard

 

 
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