PAC R polyanionic cellulose

"Advantages
Widely available and low cost polymer for fluid Loss control.
It is an effective at providing filtration control in most water based drilling fluids.
It is effective in low concentrations.
It is Non–Toxic.
It is not subjected to bacterial fermentation and calcium contamination.
Can be sed Fluid systems. http://www.s-cmc.com/"

PAC R polyanionic cellulose