Coal dust explosions remain among the greatest hazards in coal mines. Unfortunately they still occur, often with a great number of victims and with huge environmental damage. The development of mechanization contributes to the increase of dust with a greater quantity of possible initials – only some of the factors influencing this problem.
Two methods of limestone dust hydrophobization as an antiexplosive agent are proposed: from stearic acid vapour and from silicone solution. A preliminary estimate of the properties of this waterproof dust was carried out according to the Polish Standard (PN-G-11020) and by using Powder Characteristic Tester methods. Moreover, adhesive force and shear test were measured. The laboratory-produced waterproof dust meets the Polish Standard requirements. Basic investigations of the physical and chemical properties of such dusts will give us some insight into the phenomena of hydrophobization of finely dispersed materials.