PROBLEM TO BE SOLVED: To provide a brush bristle material having a superior cleaning function and an indicator function capable of accurately acquiring a decline degree of the cleaning function, and allowing the easy determination of a replacement time and a brush using the brush bristle material.SOLUTION: In the brush bristle material 1 formed of cut bristles of synthetic resin monofilaments, a cross-section perpendicular to the length direction of the cut bristle is formed of a deformed cross-sectional shape formed by connecting a plurality of unit cross section elements 3 via a connection portion 4 and, when the diameter of the unit cross section element 3 and the thickness of the connection portion 4 are defined as D and T, respectively, a value of T/D is within the range of 0.2-0.8.COPYRIGHT: (C)2009,JPO&INPIT【課題】優れた清掃性機能を有し、かつこの清掃性機能低下の度合いを的確に捉えてブラシの交換時期を容易に判断することができるインジケータ機能を備えたブラシ用毛材およびこのブラシ用毛材を使用したブラシの提供。【解決手段】合成樹脂モノフィラメントのカットブリッスルからなるブラシ用毛材1であって、前記カットブリッスルの長さ方向に垂直な断面は、単位断面要素3が連結部4を介して複数連結した異形断面形状からなり、前記単位断面要素3の直径をD、前記連結部4の厚さをTとした場合のT/Dの値が0.2~0.8の範囲にあることを特徴とするブラシ用毛材1。【選択図】図2
