Made of Borosilicate Glass, which has low expansion rate, high strength, high hardness, high temperature resistance and resistance to 200 ℃ temperature difference.
High light transmittance, high chemical stability, acid and alkali resistance.
Easy to clean and rotate in or out. Grooves in the sides help prevent slippage.
Use the hollow glass stoppers to seal lab glassware such as flasks, separatory funnels, cylinders.