ULAB Glass Beaker Set, Griffin, Low Form, with Spout, Single Scale, 50ml 100ml 250ml 500ml 1000ml 1pc of Magnetic Stir Bar Offered ( Octahedral, Teflon PTFE resin coated. Dia.8mm x L38mm) Component Materials: Type I Class A - 3.3 Borosilicate Glass Attributes: ASTM Reference - E960 Specification for Laboratory Glass Beakers Autoclaving: This product will withstand repeated standard autoclave cycles of 121°C at 15 psi for 5 minutes. Heating / Cooling: This product is designed for heating by hot plate, flame, oven, microwave or heating mantles. In normal service it can be heated many times to 230°C. It can be heated one time to 490°C in extreme service. This product can be cooled to -230°C. DO NOT plunge product directly into a liquid coolant. Place the product in the vapor phase of the liquified gasses for slow cooling prior to immersion in the coolant. Vacuum / Pressure: This product is not designed for and is not rated for vacuum or pressure applications. Sterilization: Shipped Not Sterile