Combination glass stoppers with closed bottoms may be used as [ST] joint stoppers and as reagent bottle stoppers.They are lightweight,but strong enough to keep chipping and breakage to a minimum.Barrel-shaped head is easy to clean and rotate,side grooves prevent slippage,and flat top allows stopper to stand on head.Straight type design,hollow,bottom sealing and can be used with plastic grinding mouth clamp. ● Material:Borosilicate Glass ● Color:Clear ● With standard outer joint ● High resistance to heat,chemical attack,and mechanical shock
危险品化学品经营许可证（带存储）