Yes, modern dewars are very safe when properly used and maintained.

Safety features of certified dewars: ✅ Pressure relief valve (opens at 2-3 PSI) ✅ Rupture disc (backup at 10 PSI) ✅ Double-walled insulation (prevents rapid warming) ✅ Safety locks for canes/samples ✅ Warning labels and hazard symbols ✅ Grounding lug for static dissipation

Safety statistics:

  • Properly certified dewars: <0.1% accident rate
  • Failures typically from: neglected maintenance, old equipment
  • No known cases of dewar explosion in UK in last 10 years
  • Most common issue: Spilled nitrogen (causes no injury, just inconvenience)

Safe handling requires:

  • Staff training (mandatory)
  • Proper ventilation (important)
  • Cryogenic gloves & face shield (required)
  • Clear operating procedures (essential)
  • Regular inspections (routine)