Specification Brand : Dntum BulletPoint1 : 1. Safety: Glass has a very small coefficient of thermal expansion, can withstand severe temperature changes, and has good stability. BulletPoint2 : 2. Glassware materials: Glass instruments use lead-free glass, the appearance quality is lead-containing crystal glass and lead-free ingredients, also known as non-toxic glass. BulletPoint3 : 3. Features of glassware: high-quality and thick production, high temperature resistance, temperature up to 500 degrees, let you worry-free experiment. BulletPoint4 : 4. Application: The distiller is a refined DIY for professional , fractionation, separation, and synthesis. BulletPoint5 : 5. After-sales service: If you encounter any problems during the use, please contact us by email, we will give you a satisfactory answer within 24 hours. ExternallyAssignedProductIdentifier : 7071545116511 ItemName : Dntum Laboratory Professional Chemical Experiment Equipment, 500ML High Borosilicate Glass Straight Four-Necked Flask 24 * 4 Standard Solid-Liquid Reactor Gas Generator College Teaching Supplies ItemTypeKeyword : science-lab-boiling-flasks Manufacturer : Dntum MetalType : other PartNumber : SYMXZJ0080964 ProductDescription : Tips: