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Two glass sintered filter funnels side by side

Side view showing vertical cylinder walls of sintered funnel

Close-up of the ground glass joint connection

Single glass sintered filter funnel with base

Close-up of the porous sintered glass filter disc

Glass sintered funnel shown in a filtration setup

1000ml conical G3 sintered glass filter funnel 24# joint

1000 ml conical sintered glass funnel G3 porous filter with 19/26 standard joint and vacuum side spout.

500ml conical G3 sintered glass filter funnel 24# joint

500 ml conical glass sintered funnel, G3 porous filter disc with 19/26 joint and vacuum spout.

250ml conical G3 sintered glass filter funnel 24# joint

250 ml conical glass sintered funnel G3 porous filter with 19/26 standard taper and vacuum side arm.

100ml conical G3 sintered glass filter funnel 24# joint

100 ml conical glass sintered funnel, G3 porosity filter disc with 19/26 joint and vacuum spout.

60ml conical G3 sintered glass filter funnel 24# joint

60 ml conical glass sintered funnel, G3 porosity filter disc with 19/26 standard joint.

30ml conical G3 sintered glass filter funnel 24# joint

30 ml conical sintered glass funnel G3 porous filter with 19/26 joint and vacuum side spout for micro filtration.

Features & Details

🌪️ POROSITY GRADE

G3 rating (15–40 μm pore diameter) natively. It is perfect for medium-fine filtration and general lab precipitates.

📐 BODY SHAPE

Classic conical (tapered) Büchner geometry. Features an integral vacuum spout for direct hose connection securely.

🧪 MATERIAL BASE

Premium annealed Boro 3.3 borosilicate glass completely. Features a fully fused porous disc without any chemical cements.

📏 CAPACITY & JOINT

Available in 6 sizes from 30ml to 1000ml (1 oz to 33.8 oz). All variants utilize a standard 24# ground-glass joint.

About this item

Product specification

Attribute

Product Specifications

General Information & Material

Brand Name

Huaou (Distributed by Xin Tester)

Material Base

Annealed Boro 3.3 Borosilicate Glass

Glass Standard

Conforms to ASTM E438 Type I, Class A

Filtration & Structural Specs

Porosity Grade

G3 Rating: 15–40 μm (microns) average pore diameter

Body Design

Conical (Tapered Büchner Geometry) with Integral Vacuum Spout

Disc Construction

Fully Fused Sintered Glass (No chemical cements used)

Available Sizes

30ml (1 oz), 60ml (2 oz), 100ml (3.4 oz), 250ml (8.5 oz), 500ml (16.9 oz), 1000ml (33.8 oz)

Lower Joint Size

24# Standard Ground-Glass Joint (Applies to all capacities)

Physical Properties & Tolerances

Temperature Limits

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

Sterilization

Autoclavable safely at 121°C (250°F)

Conical Sintered Glass Funnel. 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.

Optimize Cake Formation with a Tapered Glass Filter

Upgrading your lab filtration setup is easy. A conical sintered glass funnel brings the classic Büchner shape to modern porous glass filtration. It combines a tapered body with a built-in filter plate safely. We compared conical and cylindrical funnels across many recrystallization workflows. The conical shoulder guides wet filter cakes toward the center perfectly. This shape minimizes edge-channeling and produces denser cakes. We manufacture this vessel using premium annealed Boro 3.3 borosilicate glass.

This high-grade material meets strict global laboratory standards consistently. You can review exact glass durability specifications at the ASTM International glassware hub. The fully fused disc ensures absolute chemical purity during hot solvent washes. It keeps your sensitive natural compounds entirely safe from contamination. Explore our complete Lab Glassware catalog to build a highly efficient vacuum workstation today.

1Optimal Cake Recovery Design

The specific geometry of a conical sintered glass funnel directs incoming slurry inward. This physical design promotes highly uniform cake thickness immediately. It effectively reduces edge channeling that wastes valuable filtrate. Because of this, you get evenly washed products every single time. Also, the inward-sloping wall releases dried filter cakes much easier. Straight cylindrical walls tend to grip the cake perimeter tightly. Less scraping force means fewer accidental impacts on the delicate glass disc.

2Integrated Vacuum Spout

Connecting vacuum lines requires secure and leak-free joints constantly. This funnel features an integral vacuum spout positioned at the ideal angle. It fits standard Buchner clamp configurations perfectly without extra rubber adapters. In fact, this one-piece design reduces potential leak points in your assembly immediately. Every size utilizes a standard 24# ground-glass lower joint. It mates seamlessly with your existing laboratory filter flasks for rapid setup.

3High-Quality G3 Porosity

The fully fused sintered disc is rated for G3 porosity natively. It offers an average pore diameter between 15 and 40 μm. This medium-fine rating is perfect for general-purpose solid extractions. It handles catalyst isolation from reaction mixtures flawlessly. You can also clarify turbid analytical samples before spectroscopic measurements easily. The disc is fused directly into the glass body without cements. This guarantees zero chemical leaching during aggressive solvent washes.

Core Capabilities of the Filter Funnel

⚖️ 6 Volume Options

Available in 30ml, 60ml, 100ml, 250ml, 500ml, and 1000ml sizes to perfectly match your daily sample throughput.

📐 Compact Footprint

Occupies much less horizontal bench area than cylindrical counterparts. It is highly valuable when running parallel filtrations.

🌡️ Thermal Stability

Safely withstands rapid temperature differentials up to 200°C (392°F). Perfect for hot recrystallization liquid transfers.

🫧 Autoclave Safe

Fully compatible with standard steam sterilization protocols natively. You can autoclave it at 121°C (250°F) securely.

Small-batch filtration requires absolute precision and reliability daily. This conical sintered glass funnel delivers consistent cake formation every time. It is a purpose-built vessel sized exactly for your laboratory throughput requirements. In short, it keeps your extraction workflow running smoothly. Pair this funnel with our reliable Lab Vacuum Pump systems for best results. It guarantees a highly efficient filtration process.

Use Cases

Chemical Synthesis Filtration & Separation High Precision

FAQs

Q1: Should I pick the conical or cylindrical G3 funnel for my application?

A1: Choose **conical** when your priority is uniform cake formation and efficient washing — the tapering walls guide precipitate toward the disc center, producing a dense, evenly distributed filter cake that washes more efficiently than the edge-heavy cakes typical of cylindrical designs. Choose **cylindrical** when you need maximum slurry holding capacity (the straight walls hold more volume at equivalent base diameter) or when filtering highly foamy solutions where the wider top opening accommodates foam overflow better. For recrystallization product recovery (the most common use case for G3 funnels), conical is generally preferred.

Q2: What maximum vacuum pressure can the conical G3 funnel handle safely?

A2: The Boro 3.3 construction tolerates continuous vacuum down to approximately 100 mbar absolute (roughly 900 mbar below atmospheric) without risk of implosion or disc failure. However, **always apply vacuum gradually** rather than snapping the valve open — sudden pressure drops generate transient stress waves that can crack older or micro-damaged discs. For safety, start with gentle vacuum (~300 mbar below atmospheric) and increase incrementally until you achieve acceptable flow rate. Never exceed the rating of your filter flask, which is typically the weaker component in the system.

Q3: How do I prevent the filter cake from cracking during washing on a conical funnel?

A3: Cake cracking on conical surfaces usually stems from three causes: (1) **Air drawn through cracks** — maintain continuous vacuum throughout washing; never release vacuum mid-wash unless you first cover the cake surface with fresh solvent to displace air. (2) **Thermal shock** from cold wash solvent hitting a warm cake — pre-chill your wash solvent to match the cake temperature, or add it slowly in thin layers. (3) **Mechanical disturbance** from directing a stream of solvent at one spot — use a wash bottle with a wide-pattern nozzle and distribute solvent evenly across the entire cake surface. Following these three principles consistently eliminates >90% of cake-cracking incidents on conical G3 funnels.

Q4: Can I use this conical G3 funnel for hot filtration?

A4: Yes, with the same precautions as the cylindrical version. Pre-warm the funnel gradually (warm water bath or low-setting drying oven) before introducing hot filtrate to avoid thermal shock at the disc-body junction. Maximum recommended continuous operating temperature is ~200°C (well below the glass softening point of ~560°C for Boro 3.3). For repeated hot-filtration cycles, allow the funnel to cool slowly between runs rather than quenching — thermal cycling fatigue accumulates over months of aggressive hot/cold transitions and eventually initiates micro-cracks at the fused disc perimeter. One final note: hot filtration accelerates solvent evaporation through the sintered disc, so keep your vacuum source connected continuously and monitor filtrate collection rate to avoid dry-out.

Conical Sintered Glass Funnel, G3 Porous Filter with Vacuum Spout (30ml-1000ml) by Xin Tester

Price range: $15.60 through $60.83

Extra 5% Off with code: welcome5

Size

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.