Buchner Funnels, Sintered Disc (G3), Cone and Vacuum Stem

A glass sintered (fritted) disc Buchner Filter Funnel equipped with a standard ground joint stem with Vacuum . These funnels are designed for vacuum filtration where a secure, airtight connection to a filtering flask is required.

Key Features

• Body & Disc: Made from high-quality Borosilicate 3.3 glass, known for its excellent chemical resistance and thermal stability.
• Joint Type: Features a Standard Ground Mouth (conical joint) on the stem for direct fitment into laboratory flasks.
• Design: Heavy-walled construction to safely withstand the pressure differential during vacuum-assisted filtration. 
• Vacuum Hose Barb: A hose barb (tubulation socket) is integrated into the stem, allowing the connection of flexible vacuum tubing.
• Recommended Tubing I.D.: 6 mm - 8mm
• Barb Outer Diameter (O.D.): 8mm - 10mm
• Tapered Design: The barb is slightly conical; the measurement at the tip is usually 1–2 mm smaller than the measurement at the base to allow the tubing to slide on easily and then seal tightly.
• Tubing Selection: Always choose tubing with an Internal Diameter (I.D.) that is 1–2 mm smaller than the barb's widest point.
• Pressure Rating: For vacuum applications (like using a Buchner funnel), use heavy-wall vacuum tubing (typically rubber or silicone) to prevent the tube from collapsing under suction.

Porosity Grade	Pore Size ( m)	Common Application
G1	80 – 120	Coarse filtration; rapid flow
G2	40 – 80	Preparative filtration; crystalline precipitates
G3	15 – 40	Analytical work; fine precipitates (most common)
G4	5 – 15	Very fine precipitates; clarifying liquids
G5	1 – 2	Bacterial filtration; ultra-fine particles