6.5.1 Opening the grinding jar
Risks of burns and scalding
Hot grinding jar and/or sample material
− The sample material and grinding jar can get very hot during the grinding
process.
• After grinding, always wear protective gloves when handling the
grinding jar.
• Never open hot grinding jars!
• Allow grinding jars to cool down to room temperature before
opening them.
Risk of injury caused by liquid nitrogen
Use of liquid nitrogen during cryogenic grinding
− Liquid nitrogen has a boiling point of – 196 °C and causes burn-like
injuries and frostbite if there is skin and eye contact.
• Take note of the liquid nitrogen safety data sheets.
• Always wear goggles and protective gloves when using liquid
nitrogen.
Fig. 13: Grinding jars and grinding balls
Open the grinding jar as follows:
Open the grinding bowl by turning the grinding jar lid.
If the grinding jars (SP) cannot be opened, use the opening aids.
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