R 408.14453
R 408.14453 Crucibles.
Cite as Mich. Admin. Code R 408.14453
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.