It are high-quality laboratory glassware designed for precise mixing and heating applications. Manufactured from Duran borosilicate glass 3.3, these flasks offer exceptional chemical resistance and thermal durability. The conical shape facilitates efficient mixing, while the narrow neck reduces evaporation and contamination risks. Compliant with DIN ISO 1773 standards, these flasks feature easy-to-read graduation marks for approximate volume measurement and a beaded rim for added strength. Autoclavable for sterilization, they are ideal for various laboratory settings requiring reliable and durable glassware.