Fcls products is produced in new technology innovation according to the enterprise standard (q/mhlhg15-2013) . The performance is similar to the conventional fcls, but because of its low cost of production, the price is also reduced correspondingly, through which we can better serve our customers. A. Characteristics 1, fcls is suitable to all kinds of dispersed mud, due to the excellent thinning property and powerful anti-electrolytes capacity 2. Be effective at temperature more than 150~160. It can be better effective when cooperating with lignite derivatives. B. Application Fcls may be added into drilling fluids in the form of aqueous solution or powder. To adjust ph index to 9.5~10.5, the quantity of thinner should be 0.5~1.0 %. C. Package The net weight of each bag is 25kg. With paper-plastic complex valve bag