Assorted Pyrex and Kontes Single Neck Round Bottom Flask 500 ml 14/20 STJ Lot of 2 Flasks

This lot features two high-quality 500 mL Round Bottom Flasks with 14/20 Standard Taper Joints (STJ). These flasks are essential for organic synthesis, distillation, and refluxing, especially when working with smaller "microscale" or "short-path" glassware setups. The Pyrex (Corning) 4321A-500 is a laboratory staple known for its ruggedness. The 4321A series is designed for heavy-duty boiling and is made from Code 7740 borosilicate glass, which offers excellent resistance to thermal shock and chemical attack. The Kontes (DWK Life Sciences) 294000-0500 is precision-engineered glassware often preferred for its highly accurate joint grinding, ensuring a superior vacuum seal.

Used, in great condition.