laboratory glass sublimation flask designed for precise sublimation processes. 

* High Quality Glass Material: Made of borosilicate 3.3 glass with heavy wall and uniform, durability and thermal resistance. 

* Joints：Designed with a 24/40 joint for compatibility with standard laboratory glassware setups. 

* Glass Stopcock: Equipped with a glass valve for precise control of gas flow and easy operation. * Compact size: Makes it perfect for micro-scale experiments and laboratory