Rubber plug for drug vessel

摘要

A rubber plug for a drug vessel has at least one convexity formed on a surface of the rubber plug so that the rubber plug is prevented from sticking together, joining together under compression or joining together under suction with another rubber plug of a similar type. The convexity may preferably be a grain pattern formed on at least a part of the surface of the rubber plug by transferring same from a mold. A rubber plug for a drug vessel may also be composed of a leg portion and a head portion formed integrally with the leg portion and may have at least one convexity on at least one of the leg portion and the head portion.