Mich. Admin. Code R. 408.14453 - Crucibles
Rule 4453. A crucible shall:
(a) Not be used if it shows cracks, thin
spots, flaws, or dampness.
(b) Be
stored in a dry place and protected from moist air.
(c) Be carefully charged to prevent
damage.
(d) A crucible made of clay
shall not be allowed to cool after being placed in service.
(e) Be covered while transporting molten
metal emitting toxic fumes or be mechanically ventilated.
Notes
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