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Heavy duty borosilicate glass filter flasks

Features & Details

⚙️ NOZZLE CONFIG

Single upper side nozzle safely. It utilizes the European standard position to prevent dangerous liquid back-siphoning.

🧪 GLASS MATERIAL

Premium heavy-wall Boro 3.3 borosilicate glass completely. It easily withstands intense clamping torque and high vacuum pressure.

🔗 COMPATIBILITY

Features a flat-bottom design natively. It seats securely on standard porcelain or PTFE Buchner funnels without tilting.

📏 CAPACITIES

Available in 8 massive volume options. Ranges from a compact 125ml (4.2 oz) up to a 15000ml (3.9 gal) pilot plant vessel.

About this item

Product specification

Attribute

Product Specifications

General Information & Material

Brand Name

Huaou (Distributed by Xin Tester)

Material Base

Heavy-Wall Borosilicate Glass (Boro 3.3)

Manufacturing Standard

Complies with European ASTM glass dimensional standards

Design & Configuration

Nozzle Position

Single upper side nozzle (Anti-back-siphon configuration)

Body Shape

Erlenmeyer (Conical) with a flat bottom for Buchner funnel seating

Capacity Options

125ml (4.2oz), 250ml (8.5oz), 500ml (16.9oz), 1000ml (1L)
2500ml (2.5L), 5000ml (5L), 10000ml (10L), 15000ml (15L / 3.9 gal)

Physical Properties & Tolerances

Temperature Limits

Max Peak: ~500°C (932°F)
Continuous: ≤450°C (842°F)
Thermal Shock ΔT: ≤200°C (392°F)

Vacuum Compatibility

Fully rated for standard lab rotary vane pumps and water aspirators

Sterilization

Autoclavable safely at 121°C (250°F) repeatedly

Upper Nozzle Filter Flask. Reliable lab glassware designed for everyday bench use. Built with quality borosilicate glass and precision manufacturing to handle routine lab workflows without fuss. A practical addition to any lab setup.

The European Standard for Safe Vacuum Filtration

A reliable filter flask upper nozzle remains the most trusted setup for vacuum filtration globally. In fact, European research institutions prefer this exact configuration constantly. By placing the port higher, the design keeps the vacuum tubing safely above the liquid level at all times. As a result, this clever layout prevents filtrate from back-siphoning into your expensive pump. Sudden pressure changes will no longer ruin your sensitive vacuum equipment. Additionally, we manufacture these units from premium heavy-wall Boro 3.3 glass natively. Because of this, the material meets strict European dimensional standards flawlessly.

You can verify global glassware safety tolerances directly at the ASTM International root hub. Moreover, the thick walls provide incredible mechanical strength during manual handling. Thanks to this reinforcement, the vessels easily survive heavy Buchner clamp tightening without shattering. Ultimately, you can expand your extraction capabilities by pairing this vessel with our Lab Glassware accessories. Build a highly efficient and accident-free filtration workstation today.

Anti-Siphon Upper Nozzle

The side-mounted upper nozzle keeps the vacuum line completely dry. Since the port sits safely above the maximum fluid fill level, safety is guaranteed. Consequently, this setup prevents dangerous back-siphoning during unexpected pressure fluctuations. Also, the higher placement makes your benchtop tubing management much cleaner. In short, you avoid the messy tangles associated with bottom-positioned alternatives entirely.

Heavy-Wall Boro 3.3 Glass

Safety is paramount when working under intense vacuum pressure. For this reason, the flask features extreme heavy-wall construction natively. First, the thick glass resists cracking under heavy Buchner clamp torque. Meanwhile, the vessel handles extreme thermal stress from hot-filtration applications safely. In fact, the borosilicate body survives rapid temperature differentials up to 200°C (392°F) seamlessly.

Buchner Funnel Ready

The flat-bottom base design provides excellent physical stability. As expected, the flask seats securely on your workbench without wobbling. In addition, the wide neck accepts standard porcelain or PTFE Buchner funnels easily. During operation, the conical shoulder geometry guides the filtrate smoothly toward the base. Because of this shape, the filter cake surface remains perfectly level during multi-stage washes.

8 Massive Capacity Tiers

We provide scaling options for every laboratory size. For instance, small labs can use the 125ml analytical preparation models. On the other hand, organic synthesis teams prefer the 500ml to 2500ml range. Besides these, we offer massive 5-liter to 15-liter vessels for pilot plant operations. Ultimately, one reliable product family covers every single batch scale.

Whether you are isolating reaction crude or recovering solid catalysts, a dedicated filter flask upper nozzle keeps your setup pristine. Most importantly, the design prevents pump flooding and ensures maximum vacuum integrity daily. So, stop using thin-walled budget flasks that risk implosion. Upgrade your extraction workflow with our heavy-duty Lab Vacuum Pump collection today.

Use Cases

Filtration & Separation Heavy Duty Design Sample Preparation School Science Labs

FAQs

Q1: What is the difference between upper-nozzle and dual-nozzle filter flasks?

A1: An upper-nozzle (single-side) filter flask has one vacuum connection positioned on the upper shoulder of the flask body. This design is the European laboratory standard and prevents liquid back-siphoning because the vacuum inlet stays above the maximum liquid level. A dual-nozzle (upper + lower) flask adds a second lower nozzle that can serve as a drain port or secondary vacuum connection, but requires more careful level management to avoid drawing liquid into the vacuum line.

Q2: Which capacity should I choose for my typical filtration volume?

A2: Select a flask capacity of at least 3× to 4× your expected total filtrate volume. For example, if you typically collect 300-400 ml of filtrate per run, choose the 1000 ml or 1500 ml variant. This headspace allowance accommodates foam formation during vacuum application, multiple wash solvent additions, and safety margin against accidental overfilling during unattended runs.

Q3: Is this flask compatible with my existing Buchner funnel?

A3: Yes, as long as your Buchner funnel’s outer diameter does not exceed the flask’s inner neck opening. These Huaou flasks follow European standard dimensions, so they fit standard porcelain Buchner funnels (40 mm to 250 mm diameter), PTFE-coated steel funnels, and glass sintered crucibles. If you are using an oversized industrial funnel, step up one flask size to ensure proper seating without tipping risk.

Q4: Can I use this flask for hot filtration applications?

A4: Yes within limits. The Boro 3.3 heavy-wall construction tolerates hot filtrate temperatures up to approximately 150°C for continuous exposure, with short-term spikes up to 200°C acceptable during initial pour-in. However, always pre-warm the flask gradually with warm water before introducing hot liquid to avoid thermal shock cracking. Never apply direct flame heating to the flask body — use a hot plate or heating mantle if you need to keep the contents warm during extended filtrations.

Filter Flask Upper Nozzle, Heavy-Wall Borosilicate Vacuum Flask (125ml-15L) by Xin Tester

Price range: $13.79 through $226.89

Extra 5% Off with code: welcome5

Capacity

Clear

6–12 Month Warranty

Repair & Refund support available for most products.

Free Worldwide Shipping

Ships within 3 business days.

Taxes & Duties

Buyer responsible for local import fees.

24/7 After-Sales Support

Technical assistance & video guidance within 24h.