LIGNITE / HUMALITE is a naturally-occurring coal product commonly known as Brown Coal, similar to Leonardite. LIGNITE / HUMALITE is used primarily as a thinner/dispersant and secondarily as a filtration control agent in water-based fluids.
3-30 kg/m³, depending on solids content of the drilling fluid.
Appearance: Black – brown powder
Specific Gravity: 1.3-1.8
Solubility: Soluble (pH dependent)
pH: 4.5 (1% solution)