are the most appropriate. [0141] Specific examples of the inorganic fibrous material and the organic fibrous material that are easily formed into fibrils include asbestos, fibrous carboxymethyl cellulose, cellulose, a cellulose derivative including viscose rayon and acetate fibers, biofibers including bacterial cellulose and the like, a polyethylene fluoride including a polytetrafluoroethylene re