Specifications

Standard Funnel · Specifications

Standard specifications are listed below. Complies with GB/T 28211-2011 and ISO 4798. Full range from 25mm to 300mm available. Custom sizes and wall thickness available upon request.

Request custom specs

I. Short Stem Funnels (Standard Sizes)

Top Dia. (mm)	Stem O.D. (mm)	Stem Length (mm)	Overall Length (mm) approx.	Material
25	5	35	55	Borosilicate 3.3
30	6	40	65	Borosilicate 3.3
40	6~7	40~45	73~75	Borosilicate 3.3
50	7	50~55	92~95	Borosilicate 3.3
60	8	60~65	110~112	Borosilicate 3.3
75	9	75~80	135~140	Borosilicate 3.3
90	11~12	90~95	160~168	Borosilicate 3.3
100	13	100~105	180~190	Borosilicate 3.3
120	15	120~125	220~225	Borosilicate 3.3
150	17	150	275	Borosilicate 3.3
180	18	150	—	Borosilicate 3.3
210	21	160	—	Borosilicate 3.3
240	24	180	—	Borosilicate 3.3
300	26	200	—	Borosilicate 3.3

II. Long Stem Funnels (Standard Sizes)

Top Dia. (mm)	Stem O.D. (mm)	Stem Length (mm)	Overall Length (mm) approx.	Material
50	7	150	190	Borosilicate 3.3
60	8	150	200	Borosilicate 3.3
75	9	150	215	Borosilicate 3.3
90	11	150	230	Borosilicate 3.3

III. Standard Funnel vs. Standard Joint Funnel

Feature	Standard Funnel	Standard Joint Funnel
Outlet Type	Plain straight tube	Standard ground joint
Sealing Connection	Relies on contact with vessel wall	Seals directly with standard joint glassware
Applications	Routine filtration, transfer	Filtration/transfer requiring a sealed connection

For applications requiring a sealed connection, please select the Standard Joint Funnel.

* Top diameter (mm) is the outer diameter of the funnel's largest opening.
* Dimensions are industry-standard approximations and may vary slightly between manufacturers.
* Complies with GB/T 28211-2011 and ISO 4798 standards.
* Custom sizes, wall thickness, and stem lengths available upon request.
* For bulk customization, please contact our sales team for MOQ and lead time.

✦ Custom Services — Non-standard sizes, wall thickness, and stem lengths available. Contact us with your specific requirements and our technical team will provide a tailored solution.

Description

The standard funnel is the most fundamental filtration and transfer tool in the laboratory, widely used in chemistry, biology, pharmaceuticals, environmental testing, and more for liquid filtration, solid-liquid separation, and liquid/powder transfer. Manufactured from borosilicate glass 3.3, it offers excellent chemical resistance and thermal stability.

The funnel body features a 60° standard cone angle for perfect filter paper fit and optimal filtration efficiency. Two stem options are available: short stem for routine filtration and transfer, and long stem for gas-generating apparatus where the tip must be submerged below the liquid surface to prevent gas escape. Sizes range from 25mm to 300mm top diameter. Complies with GB/T 28211-2011 and ISO 4798 standards.

✦ Key Advantages: 60° standard cone angle ensures a perfect filter paper seal; 45° beveled outlet accelerates liquid flow; high transparency allows clear observation of the filtration process; smooth rim prevents filter paper damage.

Key Features

Borosilicate Glass 3.3: Low thermal expansion, excellent chemical resistance
60° Standard Cone Angle: Ensures perfect filter paper fit
High Transparency: Clear visibility of filtration process
Smooth Rim: Prevents filter paper from tearing
45° Beveled Outlet: Accelerates liquid flow
Short/Long Stem Options: Short for routine use; long for gas-generating apparatus
Wide Size Range: Top diameters from 25mm to 300mm

Quality Assurance

Every standard funnel undergoes rigorous dimensional inspection, visual inspection, and material testing to ensure compliance with applicable national standards. Bulk order customization is available — please contact us for details.

Tip: Always inspect the funnel for cracks or defects before use. Fold filter paper to a cone shape and wet it to ensure it adheres to the inner wall. Keep the liquid level below the filter paper edge. For long stem funnels, ensure the tip is submerged below the liquid surface.

Applications

Typical Applications

Liquid Filtration

Gravity filtration with filter paper to separate solids from liquids

Liquid Transfer

Transferring liquids from larger to smaller-mouth vessels

Powder Transfer

Adding solid powders to reaction vessels

Gas Generation

Long stem funnels for adding liquids with the tip submerged below the liquid surface

Teaching Labs

High school and university chemistry lab courses

Compatible Equipment

Beakers, Erlenmeyer flasks, volumetric flasks, test tubes

Iron stands and utility clamps

Gas-generating apparatus (Kipp generators, gas bottles)

Tip: Use filter paper that matches your funnel diameter. Fold it into a cone shape and wet it to ensure it adheres to the inner wall. Keep the liquid level below the filter paper edge for optimal filtration results.

Standard Funnel Operation Guide

03

I. Before Use

Inspect the funnel for cracks, chips, or scratches
Clean the funnel with a soft cloth to remove any particles
Select the appropriate filter paper size
Ensure the receiving vessel mouth is compatible with the funnel size

04

II. Filtration Procedure

Fold the filter paper in half twice to form a 90° sector shape
Open it into a cone with one side triple-layered and the other single-layered
Place the cone into the funnel and wet with a small amount of solvent to seal it against the wall
Place the funnel stem against the inner wall of the receiving vessel
Use a glass rod to guide the liquid — pour slowly along the rod
Rest the glass rod against the triple-layered side of the filter paper to avoid tearing
Keep the liquid level below the filter paper edge

05

III. Powder Transfer Procedure

Place the funnel stem against the inner wall of the receiving vessel
Add powder gradually along the funnel wall using a spatula
Tap the funnel gently to help powder flow smoothly

06

IV. Cleaning & Maintenance

Clean immediately after use to prevent residue from drying
Use a soft brush and mild detergent — never use abrasive tools on the inner wall
Air dry naturally after cleaning; avoid impact
Store without stacking to prevent deformation or breakage

Standard Funnel · Selection Guide

Selecting the right standard funnel involves three key considerations: stem length, top diameter, and material.

I. By Stem Length

Stem Type	Stem Length	Best For
Short Stem	40 ~ 200mm (varies with diameter)	Routine filtration, liquid transfer — simple and convenient
Long Stem	~150mm (fixed)	Gas-generating apparatus — tip must be submerged below liquid surface

II. By Top Diameter

Top Diameter	Best For	Recommended Filter Paper
25 ~ 40mm	Micro-scale operations, small vessels	Φ40-55mm
50 ~ 60mm	Routine lab use — most common	Φ70-90mm
75 ~ 90mm	Medium-scale filtration	Φ110-125mm
100 ~ 150mm	Large-volume filtration, rapid pouring	Φ150-185mm
180 ~ 300mm	Industrial-scale, high-throughput filtration	Φ240-300mm

III. By Material

Material	Features	Best For
Borosilicate Glass 3.3	High temperature resistance, chemical resistance, high clarity	Most laboratory applications
Soda-lime Glass	Good clarity, lower cost, not heat-resistant	Routine operations without heating (budget-conscious)

IV. Quick Selection Matrix

Follow this decision flow to quickly find the right size:

① What's your application? Routine filtration/transfer → Short stem | Gas generation → Long stem
② What's your volume? Micro (< 50ml) → 25-40mm | Routine (50-500ml) → 50-90mm | Large (>500ml) → 100-300mm
③ Will you apply heat? Yes → Borosilicate Glass 3.3 | No → Soda-lime Glass (budget option)

✦ Need help selecting? Contact our technical support team with your filtration requirements and operating conditions — we'll recommend the optimal configuration.

Care & Notes

Show care & notes

Safety Precautions

Always work in a fume hood when handling strong acids, bases, or flammable liquids
Wear protective gloves and safety goggles

Do not

Never use a cracked or damaged funnel
Do not apply pressure during filtration — glass may break