Particles that have low resistivity are diffcult to collect because they are easily charged (very conductive) and rapidiy lose their charge on arrival at the collection electrode. the particles take on the charge of the collection electrode, and become re-entrained in the gas stream. thus , attractive and repulsive electrical forces that are normally at work atnormal and higher resistivtites are lacking , and the binding forces to the plate are considerably lessened. Examples of iox-resistivity dusts are unburned carbon in fly ash and carbon black.