Description

Test Tube W/Out Rim, Borosilicate Glass

This solid glass stopper feature a closed bottom with a tapered ground inner joint, designed for securely sealing glassware items such as flasks, cylinders, and funnels. It is constructed in a solid plug style with a vertical penny head and a sealed bottom for reliable containment. Each stopper is manufactured from Borosilicate 3.3 glass, meeting ASTM E438 Type 1 Class A standards, with a 24/40 inner joint.