Of the 6 observations, the four patients who had a fatal outcome all breathed almost pure silica, 3 in the context of exposure to the scouring powder, only one during the handling of "silica flour" in foundry.
Of the 6 observations, the four patients who had a fatal outcome all breathed almost pure silica, 3 in the context of exposure to the scouring powder, only one during the handling of "silica flour" in foundry.