For Column Chromatography G3 20x300mm Pyrex glassware, here are the details regarding specifications and availability:

Product Specifications

• Dimensions: It features a 20mm internal diameter (ID) and a 300mm effective length, making it suitable for high-resolution separations.
• G3 Fritted Disc: The “G3” designation refers to the porosity of the integrated sintered glass disc at the bottom. A G3 grade typically has a pore size of 16 to 40 µm, acting as a support for stationary phases like silica gel while allowing the mobile phase to pass through.
• Material: Generally manufactured from borosilicate glass (Pyrex), which offers high chemical durability against organic solvents and thermal shock resistance.
• Common Features:
  • Stopcock: Usually includes a PTFE (often Rotaflo) or glass stopcock for precise control of eluent flow.
  • Joints: Often features standard ground glass sockets (e.g., 19/26) to allow for the attachment of reservoir vessels.