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35ml G3 sintered glass filter funnel with 24# joint

5000ml G3 sintered glass filter funnel with 40# joint

100ml G3 sintered glass filter funnel with 24# joint

5000ml G3 sintered glass filter funnel with 24# joint

3000ml G3 sintered glass filter funnel with 40# joint

3000ml G3 sintered glass filter funnel with 24# joint

2000ml G3 sintered glass filter funnel with 24# joint

1000ml G3 sintered glass filter funnel with 24# joint

500ml G3 sintered glass filter funnel with 24# joint

250ml G3 sintered glass filter funnel with 24# joint

150ml G3 sintered glass filter funnel with 24# joint

60ml G3 sintered glass filter funnel with 24# joint

Features & Details

🌪️ POROSITY GRADE

G3 rating (15–40 μm pore size). It provides excellent medium-fine filtration for general laboratory precipitates.

📐 BODY DESIGN

Straight-wall cylindrical shape. Features an integral vacuum spout to eliminate the need for extra glass adapters.

🔗 JOINT OPTIONS

Standard 24# joint for all sizes. Heavy-duty 40# joint available for massive 3000ml and 5000ml industrial capacities.

🧪 MATERIAL

Annealed Boro 3.3 borosilicate glass. Features a fully fused disc that resists severe thermal shock safely.

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

Filtration & Structural Specs

Porosity Grade

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

Body Design

Cylindrical (Straight-Wall) with Integral Vacuum Spout

Disc Construction

Fully Fused Sintered Glass (Zero chemical cements used)

Volume Capacities & Joint Matching

Standard 24# Joint

35ml, 60ml, 100ml, 150ml, 250ml, 500ml, 1000ml (1L), 2000ml (2L), 3000ml (3L), 5000ml (5L)

Heavy-Duty 40# Joint

Specifically available for 3000ml (3L) and 5000ml (5L) industrial production 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)

Cylindrical 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.

The Ultimate Workhorse for Medium-Fine Filtration

Upgrading your filtration process requires the right laboratory tools. A cylindrical sintered glass funnel offers the perfect mechanical balance. It sits perfectly between ultra-fine crucibles and coarse G2 funnels. Ultra-fine filters clog too fast during routine precipitate collection. Coarse filters often let valuable fine particles slip through entirely. Our G3 porosity rating captures most inorganic precipitates easily. It maintains an excellent flow rate under standard vacuum pressure. This makes it the absolute default choice for teaching laboratories. It is also highly favored by professional process development teams.

We manufacture this funnel from annealed Boro 3.3 borosilicate glass natively. This premium material meets stringent global testing standards. You can verify glass durability requirements at the ASTM International official standards. The fully fused disc withstands intense thermal cycling safely. It survives hot filtrate pours and cold water rinses easily. Check out our Lab Glassware collection to find more premium testing vessels.

G3 Porosity Grade (15–40 μm)

This funnel features a precision G3 porosity rating. The average pore diameter ranges from 15 to 40 μm. It is perfectly optimized for medium-fine particulate capture. It easily retains typical inorganic precipitates and metal hydroxides. You can maintain reasonable flow rates under standard vacuum pressure. It is the ideal general-purpose grade for mixed-filtration workloads.

Fully Fused Sintered Disc

The porous glass disc is fused directly to the body. We do not use any chemical cements during manufacturing. This eliminates the common adhesive failure points found elsewhere. The solid integration easily withstands intense thermal shock. You can run hot filtrate up to 200°C (392°F) safely. Cold rinse water will not cause disc delamination.

Integral Vacuum Spout

Connecting vacuum lines is now faster and much safer. This unit includes a built-in angled vacuum spout natively. It connects directly to your vacuum line or flask side-arm. You do not need any separate ground-glass adapters. This smart design reduces potential leak points significantly. It simplifies your Buchner funnel assembly process immediately.

Heavy-Duty Joint Options

We offer standard 24# joints for most typical capacities. These fit standard laboratory clamp stands and heating mantles perfectly. We also manufacture massive 3000ml and 5000ml production variants. These large models offer heavy-duty 40# joint options natively. This guarantees extra mechanical stability during heavy batch processing. You get the perfect vessel for every tier.

Whether you are isolating recrystallized organic products or recovering metal catalysts, a reliable cylindrical sintered glass funnel keeps your filtration reproducible. It remains crack-free during daily intense laboratory use. Expand your extraction capabilities with our Lab Vacuum Pump collection. Build a highly efficient and safe filtration workstation today.

Use Cases

Chemical Synthesis Filtration & Separation Heavy Duty Design

FAQs

Q1: When should I choose G3 porosity instead of G2 or G4?

A1: Use **G3** as your default choice for general-purpose filtration where you expect particle sizes in the 20–100 μm range (typical inorganic precipitates, metal hydroxides, recrystallized organics). Choose **G2** (40–100 μm) only for very coarse separations like removing drying agent granules or large undissolved solids. Choose **G4** (4–16 μm) when you need fine retention such as catalyst removal below 10 μm or polishing filtration before HPLC injection. Most teaching labs and process-development teams find G3 covers 80%+ of their daily filtration workload without the clogging issues that plague G4 funnels with even moderately fine slurries.

Q2: Can I heat a G3 sintered funnel to speed up filtration of viscous liquids?

A2: Yes, with precautions. You can warm the funnel body gently with a heat gun or place it in a drying oven at 80–120°C to lower the viscosity of the filtrate and improve flow rate. However, **never** apply direct flame to the sintered disc area — localized thermal stress can crack the fused disc-body junction. Always pre-warm the entire funnel uniformly, and allow it to cool gradually after filtration rather than quenching in cold water. The Boro 3.3 composition handles ΔT up to 200°C, but rapid temperature gradients at the disc seal are the leading cause of funnel failure.

Q3: How do I clean a clogged G3 sintered disc without damaging it?

A3: Reverse-flow flushing is the safest method: attach the vacuum line to the top of the funnel (instead of the spout) and pull clean solvent backward through the disc while gently tapping the funnel side. For stubborn organic residues, soak the inverted funnel in a compatible solvent (acetone for organics, dilute HCl for inorganic salts) overnight, then flush. **Never** use wire brushes or metal probes on the sintered surface — they gouge pores permanently and alter the effective porosity rating. If chemical soaking fails, a final-resort option is controlled calcination in a muffle furnace at 500°C for 1 hour to burn off carbonaceous deposits, though this risks thermal stress cracking on older funnels.

Q4: What is the difference between the 24# and 40# joint options?

A4: The number refers to the **ground-glass joint outer diameter** in millimeters approximately (24# ≈ 24 mm, 40# ≈ 40 mm). The 24# joint is the laboratory standard and fits almost all clamp stands, heating mantles, and filter-flask adapters. Select the 40# joint option only for 3000 ml or 5000 ml capacity variants when you anticipate heavy-duty usage (large slurry volumes, frequent handling, or mounting in industrial-scale setups where the wider joint distributes clamping stress more evenly). Note: 40# variants are slightly more expensive due to the larger ground-glass surface finish requirement.

Cylindrical Sintered Glass Funnel G3, Porous Filter with Vacuum Spout (35ml-5000ml) by Xin Tester

Price range: $14.09 through $396.29

Extra 5% Off with code: welcome5

Capacity

Joint Size

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.