To be accepted for underground waste disposal or reutilisation, wastes may not be 

• radioactive, 
• explosive, 
• highly flammable, 
• liquid, 
• infectious, 
• malodorous or 
• under deposit conditions easily flammable.

Under deposit conditions there may be no reactions of the waste with itself or with the rock that cause 

• an expansion of the volume, 
• the formation of auto-flammable, toxic or explosive substances or gases or
• other dangerous reactions.

For undergound disposal the wastes heating value may not exceed 6,000 kJ/kg and the waste may not be biodegradable.