Retsch MM 400 - Causes; Burns through Splashes; Burns through Contact; Recommendations

Safety
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– make specific materials (metal and plastic) that are not suitable for low temperatures brittle
– generate strong misting depending on atmospheric humidity
2.9.2 Causes
There are two types of cryogenic burns:
2.9.2.1 Burns through splashes
When handling samples and in general when handling liquid nitrogen, personnel must protect
themselves from splashes. They can cause cryogenic burns with serious consequential
damage, in particular to eyes and face.
2.9.2.2 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.
2.9.3 Recommendations
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.
2.9.4 General rules of conduct for splashes with liquid nitrogen
2.9.4.1 To the eyes
• Rinse eyes with much water for 15 min.
• Follow the company instructions for emergencies.
• Consult a doctor
2.9.4.2 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.