Designed for use in professional laboratories, also ideal for classroom and home daily use. 100-1000ML Glass Erlenmeyer Flask Straight Small Mouth Triangle Flask For Laboratory I3167812613 Chemistry Glassware Set 5pcs 500ml Erlenmeyer Glass Bottle Laboratory Borosilicate Glassware Capacity Bottle Conical Flask Transparent Glass Flask Borosilicate Glass Flask These glass flasks are made of 3.3 Borosilicate material, they are designed with heavy duty rims to reduce chipping. Conical Type and Narrow Mouth: These flasks are narrow mouth in conical type, with printed graduation and extra large marking spot Good Heat and Chemical Durability: These flasks will withstand repeated standard autoclave cycles of 121°C at 15 psi for 5 minutes, they are designed for heating by hot plate, flame, oven, microwave or heating mantle. With Blue Cap, Narrow Mouth Erlenmeyer Flasks, Borosilicate 3.3 Glass Conical Flask For Lab Experiment Chemistry Science, 4016.0771.2 Capacity: 2Pcs 500ml lab glass Erlenmeyer flasks in total.