SPARE LEAD TYPE HOLDER PENCIL LEAD

摘要

PROBLEM TO BE SOLVED: To provide a spare lead type holder pencil lead which has high strength, is difficult to break and allows optionally breaking, secures stable writing of lines and writing of small characters in an angular style and produces less shavings owing to unnecessity of sharpening.;SOLUTION: To provide a spare lead type holder pencil lead 10 is formed by baking a composition having formativeness and showing a high carbon residue yield after baking to form amorphous carbon and dispersing one or more constitution materials selected from carbon powder, metalloid nitrides, metalloid oxides and clay minerals in the amorphous carbon so as to be orientation-controlled uniformly in one direction to a high degree.;COPYRIGHT: (C)2016,JPO&INPIT