Our borosilicate glass funnel with standard ground joints (19/26, 24/29) is a must-have lab tool for precise liquid/powder transfer, filtration, and microscale experiments. Crafted from high-purity borosilicate glass, it delivers exceptional thermal shock resistance, chemical corrosion resistance, and durability—perfect for long-term lab use.

Features Of Borosilicate Glass Funnel 

● Perfect Compatibility: Precision-machined 19/26/24/29 ground joints ensure tight sealing with round-bottom flasks, reaction kettles, and other lab glassware—no leakage or gas escape.

●  High Thermal Stability: Borosilicate glass resists temperatures from -80°C to 500°C, suitable for hot/cold liquid transfer without cracking.

● Smooth & Non-Stick: Polished inner wall prevents sample residue, easy to clean and sterilize, meeting lab hygiene standards.

● Versatile Use: Ideal for chemical synthesis, pharmaceutical research, food testing, and educational experiments; supports solid powder, liquid, and filter paper filtration operations.

Q&A 

 Q1: What is the difference between 19/26 and 24/29 ground joint funnels?

 A: The numbers represent joint specifications (joint outer diameter/inner cone height). 19/26 is a small joint, matching 50-250mL round-bottom flasks for microscale experiments. 24/29 is a medium joint, suitable for 500-2000mL flasks and large-volume liquid/powder transfer. Choose based on your flask volume and experiment scale.

Q2: Can this glass funnel be used for hot liquid transfer?

 A: Yes. Made of high borosilicate glass, it has excellent thermal shock resistance (can withstand rapid temperature changes of 150°C). For extremely hot liquids, preheat the funnel slightly with warm water first to avoid sudden cracking.

Q3: How to clean and maintain the ground joint funnel?

 A:① After use, rinse immediately with corresponding solvent (water for aqueous solutions, ethanol/acetone for organic solvents) to prevent residue curing.        

    ② For stubborn stains, soak in dilute acid/base solution (avoid strong corrosion) then rinse thoroughly.

    ③ Store with a small amount of glycerin on the joint to prevent adhesion, avoid hard collisions during handling.

Q4: Is this funnel suitable for solid powder transfer?

 A: Absolutely. Its wide-mouth conical design facilitates smooth powder feeding, and the narrow ground joint connects tightly to reaction vessels—preventing powder from scattering and ensuring experimental safety. Perfect for adding solid reagents in organic synthesis experiments.