Retsch Cryomill - Manual (Page 56)

Safety and occupational health instructions
56
9.4.2.2 Burns through contact
Contact of the skin with cold material causes frostbite or cryogenic burns.
The interior of vessels or the samples may never be touched or held with bare
hands.
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9.4.3 Recommendations
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In order to prevent the danger of burning the following points must be observed:
• Never bring cryogenic liquids in contact with the skin.
• Never touch the cold non-isolated or iced walls of a vessel.
• Wear personal protective equipment (suitable gloves, goggles or face
protection and safety shoes).
• Keep the vessel upright.
• Use suitable material (e.g. metal hose or PTFE hose) to refill.
• Train personnel.
This list is not complete.
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9.4.4 General rules of conduct for splashes with liquid nitrogen
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9.4.4.1 To the eyes
• Rinse eyes with much water for 15 min.
• Follow the company instructions for emergencies.
• Consult a doctor
9.4.4.2 On the skin
• Do not rub.
• If possible remove or loosen clothing.
• Slowly and gradually warm the parts affected.
• Do not apply anything to the burnt area.
• Follow the company instructions for emergencies.
• Consult a doctor.
Both lists are not complete.
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9.5 Danger of explosion
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9.5.1 Dangers
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The evaporation of liquid nitrogen may lead to an overpressure in the vessel.
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9.5.2 Causes
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An increase in the vessel may be attributable to:
– incorrect set-up (use of a closable lid)
– icing on the neck and on the insulating lid