Lab-Grade Glass Dewar Flask, vented polyethylene stopper, 350mL

Annealed borosilicate glass reduces risk of flask implosion.

Highly efficient laboratory-grade Dewars feature low heat conductivity and high vacuum. Annealed borosilicate glass reduces risk of flask implosion. Weighted base reduces spillage. Resilient plastic mesh covering cushions the flask and ensures a firm grip. Vented polyethylene stopper (included) minimizes evaporation.