S-2.1, r. 15 - Regulation respecting safety and health in foundry works
10. Explosions of molten metal: To avoid explosions of molten metal, the following is forbidden:
(a) the introduction of substances or any damp objects into molten metal;
(b) the pouring of molten metal in a damp receptacle; and
(c) the introduction of pieces having hermetically closed cavities in molten metal.
R.R.Q., 1981, c. S-2.1, r. 20, s. 10.