Two-Arm Filtering Flasks are specialized containers for multi‑purpose vacuum filtration in laboratories, precision‑manufactured from borosilicate glass 3.3. Featuring both an upper and a lower tube, these flasks offer greater flexibility for a variety of filtration applications. They are ideal for pharmaceutical, chemical, biological, and food testing laboratories.
To be confirmedCapacity
54 – 286 mmBody O.D.
110 – 520 mmHeight
8 – 10 mmUpper Tube I.D.
Specifications are subject to confirmation with your enquiry.
Please contact us to confirm the available specifications.
* Custom capacities and special specifications are available upon request.
* Tube dimensions are standard. Please specify if custom sizes are required.
Product Description
Two-Arm Filtering Flasks are specialized containers for multi‑purpose vacuum filtration in laboratories, precision‑manufactured from borosilicate glass 3.3. Featuring both an upper and a lower tube, these flasks offer greater flexibility — the upper tube connects to a vacuum pump for negative‑pressure filtration, while the lower tube can be used to connect to a receiving vessel or to create a continuous filtration system. Widely used for HPLC mobile phase filtration, buffer sterilization, particulate removal, and sample preparation, they are ideal for pharmaceutical, chemical, biological, and food testing laboratories.
Key Features
Borosilicate glass 3.3: ISO 3585 compliant, thermal shock resistant to 280°C, excellent chemical resistance
Upper + lower tube design: Upper tube connects to vacuum pump, lower tube connects to receiving vessel or enables continuous filtration
High clarity: Clear glass body enables easy monitoring of filtration progress and filtrate collection
Uniform wall thickness: Maintains structural integrity under vacuum conditions
Multiple capacities: Available in 125mL, 250mL, 500mL, 1000mL, 2500mL, 5000mL, 10000mL, 15000mL, and 20000mL
Quality Assurance
Every unit undergoes rigorous dimensional inspection, wall thickness testing, and visual examination to ensure safety and reliability during vacuum filtration operations.
Note: Two-Arm Filtering Flasks are designed for vacuum filtration operations. We recommend operating at a vacuum pressure not exceeding 0.08MPa. The lower tube can be connected to a receiving vessel or sealed with a stopper to support various filtration configurations.
Applications
Typical Uses
HPLC analysis
Vacuum degassing and filtration of mobile phases and solvents
Pharmaceutical industry
Sterile filtration of water for injection, buffers, and drug solutions
Chemistry labs
Solid‑liquid separation and purification of reaction products
Biology labs
Sterile filtration of media and cell culture media
Continuous filtration systems
Building continuous or series filtration setups using both tubes
Food testing & environmental monitoring
Filtration in sample preparation
Compatibility Recommendations
Flask + Filter Assembly + Vacuum Pump
Standard vacuum filtration with lower tube sealed
Flask + Filter Assembly + Receiving Vessel
Continuous filtration with filtrate flowing through lower tube
Flask + Series Filtration System
Multiple flasks connected in series for multi‑stage filtration
Flask + Membrane Filter Holder
For microfiltration and sterile filtration applications
Tip: Two-Arm Filtering Flasks offer greater flexibility than side‑arm flasks with an additional lower tube, enabling continuous filtration, series filtration, and other advanced setups. Choose based on your specific filtration requirements.
Operation & Maintenance
Two-Arm Filtering Flask User Guide
03
Before Use
Inspect for cracks, chips, or scratches before use
Ensure the flask is clean and dry to prevent contamination of filtrate
Check that both upper and lower tubes are intact — no damage or looseness
Select appropriate filter membrane or filter paper
