Use precautions:
1. Particular care should be taken in the use of materials with excessive hardness and not in contact with hydrofluoric acid.
2. When grinding, the grinding bowl should be placed on an object that is not easy to slide, and the grinding bowl should be kept perpendicular. Bulk solids can only be crushed, can not be crushed with pestles, otherwise it will damage the grinding bowl/pestle or splash solids, explosive materials can only be gently fragmented, can not be grinded, when grinding corrosive substances to the skin, should be covered with a thick grinding bowl. Paper or plastic sheets are then opened in the center, inserted into the lapping piece and then ground. The amount of solid in the lapping bowl shall not exceed one third of its volume.
3. The grinding bowl should not be heated and should not be dried in an electric oven.
4. When washing and coating the mortar, it should be washed with water first. The acid-resistant mortar can be washed and coated with dilute hydrochloric acid.