Pyrex Round Bottom Flask Angled 3-Neck 250 ml 24/40 Outer Joints - Lot of 2 Flasks

Premium Borosilicate Glass for Versatile Chemical Reactions

Upgrade your synthesis setup with this set of two (2) Pyrex 4965-250 Round Bottom Flasks. With a 250 mL capacity and a versatile 3-neck configuration, these flasks are the industry standard for performing complex chemical reactions, refluxing, and distillation.

Manufactured from borosilicate glass, these vessels offer the exceptional thermal stability and chemical resistance that scientists have trusted for over a century. The round-bottom geometry ensures uniform heat distribution, preventing hot spots and ensuring smooth boiling, while the angled side necks provide convenient access for addition funnels, condensers, or thermometers without interfering with the central stirring rod.

Key Features & Benefits

• Versatile 3-Neck Configuration: Features a vertical center neck for stirring and two angled side necks for simultaneous addition of reagents and temperature monitoring.
• Universal Compatibility: All three necks are equipped with precision-tooled 24/40 Standard Taper outer joints, ensuring a secure, leak-free fit with a wide range of laboratory glassware.
• Pyrex Durability: Made from low-expansion Code 7740 borosilicate glass, designed to withstand high temperatures and resist chemical attack from acids and salt solutions.
• Uniform Heating: The spherical base maximizes surface area for heating mantles, promoting efficient and even heat transfer throughout the reaction mixture.

Technical Specifications

Used, very clean. Looks like new.