PROBLEM TO BE SOLVED: To provide a rubber member which is hard to degrade even after radiation sterilization by irradiation with &gamma ray or the like is performed, a sterilized medical rubber member with radiation sterilization processing by irradiation with the &gamma ray or the like, and a rubber composition used for manufacturing the medical rubber member which is hard to degrade even after the radiation sterilization by the irradiation with &gamma ray or the like is performed.SOLUTION: The medical rubber member contains 100 parts of mass of silicone rubber and silica of 20 parts of mass to 45 parts of mass. In the sterilized medical rubber member, the rate of change of tearing strength before and after the radiation sterilization processing of irradiating the &gamma ray at an exposure rate of 50 kgy is in the range of -25 to 0%. The rubber composition used for the medical rubber member contains 100 parts by mass of silicone rubber and silica of 8 parts by mass to 30 parts by mass.COPYRIGHT: (C)2009,JPO&INPIT【課題】γ線等の照射による放射線滅菌を行っても劣化しにくい医療用ゴム部材、γ線等の照射による放射線滅菌処理してなる滅菌済医療用ゴム部材、及び、γ線等の照射による放射線滅菌を行っても劣化しにくい医療用ゴム部材を製造するのに用いられるゴム組成物を提供すること。【解決手段】100質量部のシリコーンゴムと、20質量部以上45質量部以下の無水ケイ酸とを含有することを特徴とする医療用ゴム部材、50kgyの照射量でγ線を照射する放射線滅菌処理前後における引裂き強度の変化率が-25%以上0%以下であることを特徴とする滅菌済医療用ゴム部材、及び、100質量部のシリコーンゴムと、8質量部以上30質量部以下の無水ケイ酸とを含む、医療用ゴム部材に使用されるゴム組成物。【選択図】 図1
