... substitution degree Water base drilling fluid viscosifier Poly anioniccellulose -PAC is white or yellowish powder, which is non-toxic, odorless, ... , with stable resistance to heat, salt and bacteria.Our PAC-HV, PAC-LV has high substitution degree, high substitution evenness.Suitable for ... at hnkingway dot comHenan Kingway Chemicals Co., Ltd. Poly anioniccellulose,PAC- HV drilling mud viscosifier