Specifications

Spherical Separatory Funnel · Specifications

Standard sizes are listed below. All products comply with GB/T, ASTM, and ISO standard taper systems. Full range 10/19 ~ 60/45 available. Custom capacities, joint sizes, and seal materials are available.

Request custom specs

1. Seal Material Configurations

Component	Material	Typical Use	Features
Top Stopper	Glass	Standard organic solvents	High clarity, resistant to most organics
	PTFE	Strong acids, bases, aggressive systems	Resists all chemicals, no lubrication
	Plastic	General use, budget-conscious	Lightweight, low cost
Bottom Stopcock	Glass	Standard organic solvents	Requires grease, cost-effective
Bottom Stopcock	PTFE	Strong acids, bases, aggressive systems	Resists all chemicals, no lubrication, excellent seal

2. Spherical Separatory Funnel Sizes

Note: Top stopper and bottom stopcock materials can be freely combined. Capacities range from 10ml to 10000ml for micro to industrial applications.

Capacity (ml)	Joint Size	Stopcock Bore (mm)	Stem O.D. (mm)	Top Stopper	Bottom Stopcock
10	19/26	2	—	Glass/PTFE/Plastic	Glass/PTFE
25	19/26	2	—	Glass/PTFE/Plastic	Glass/PTFE
60	19/26	2	9	Glass/PTFE/Plastic	Glass/PTFE
125	14/23 / 19/26 / 24/29	2	9	Glass/PTFE/Plastic	Glass/PTFE
250	19/26 / 24/29 / 29/32	4	10	Glass/PTFE/Plastic	Glass/PTFE
500	24/29 / 29/32	4	10	Glass/PTFE/Plastic	Glass/PTFE
1000	24/29	4	12	Glass/PTFE/Plastic	Glass/PTFE
2000	29/32	4	—	Glass/PTFE/Plastic	Glass/PTFE
3000	34/35	4	—	Glass/PTFE/Plastic	Glass/PTFE
10000	45/40	6	—	Glass/PTFE/Plastic	Glass/PTFE
5000	—	—	—	—	—

3. Spherical vs Pear-Shaped Comparison

Feature	Spherical Funnel	Pear-Shaped Funnel
Body Shape	Spherical	Pear-shaped
Neck Length	Long	Short
Primary Use	Dropping in gas-generating setups	Extraction and separation
Mixing Efficiency	Faster, more thorough	Standard

4. Standard Joint Specifications (GB/ASTM/ISO)

GB/T	ASTM	ISO
14#	14/20	14/23
19#	19/22	19/26
24#	24/40	24/29
29#	29/42	29/32

* Joint numbers (14#, 19#) indicate the largest diameter (mm) of the taper. All are 1:10 taper.
* GB/ASTM/ISO designations are different standard identifiers — physical dimensions are identical and fully interchangeable.
* Top stopper and bottom stopcock materials can be freely combined.
* Contact our sales team for MOQ and lead time on custom orders.

✦ Customization Services — We offer custom capacities, joint sizes, stopper and stopcock materials. Share your specific requirements and our technical team will provide a tailored solution.

Product Description

The spherical separatory funnel is a versatile glass apparatus for liquid dropping in gas-generating setups and liquid-liquid separation. Its spherical body has a larger diameter than pear-shaped or cylindrical funnels of the same capacity, allowing liquids to be mixed quickly and thoroughly during shaking.

Manufactured from high-borosilicate glass 3.3 with a long neck, it is ideal for dropping liquids in gas-generating apparatus. The top stopper is available in glass, PTFE, or plastic, while the bottom stopcock is available in glass or PTFE for optimal chemical compatibility.

✦ Spherical Design Advantage: The spherical body has a larger diameter than pear-shaped or cylindrical funnels of the same capacity, allowing faster and more thorough mixing during shaking.

Key Features

Borosilicate Glass 3.3: Meets ISO 3585, low thermal expansion, thermal shock resistance, excellent chemical durability
Spherical Body: Larger diameter for faster, more thorough mixing compared to pear-shaped or cylindrical funnels
Long Neck: Ideal for dropping liquids in gas-generating apparatus
Top Stopper Options: Glass (organic solvent compatible, high clarity), PTFE (resists all chemicals, no lubrication), Plastic (lightweight, cost-effective)
Bottom Stopcock Options: PTFE (resists acids/bases, no lubrication, excellent seal) or Glass (organic solvent compatible, cost-effective)
Standard Joint: 1:10 taper, fully interchangeable, reliable sealing

Quality Assurance

Each spherical separatory funnel is inspected for dimensional accuracy, stopcock seal integrity, and taper precision to ensure reliable sealing with all standard joint components. Custom bulk orders are welcome.

Tip: The spherical separatory funnel is particularly suitable for dropping liquids in gas-generating setups. Check stopcock rotation and stopper seal before use. Glass stopcocks may require a thin layer of vacuum grease; PTFE stopcocks require no lubrication.

Applications

Typical Uses

Gas-Generating Dropping

Long neck for dropping liquids in gas-generating apparatus

Liquid-Liquid Separation

Separate immiscible liquid phases based on density differences

Extraction

Extract target compounds using immiscible solvents

Reaction Rate Control

Regulate liquid addition rate via stopcock adjustment

Mixing Operations

Spherical body enables fast, thorough mixing during shaking

Compatible Equipment

Standard joint flasks, condensers, distillation heads

Gas-generating apparatus (Kipp generators, gas bottles)

Ring stands and clamps

Tip: The spherical design enables faster, more thorough mixing during shaking. Particularly suitable for dropping liquids in gas-generating setups.

Operation & Maintenance

User Guide

Before Use

Inspect for cracks, chips, or scratches
Check stopcock rotation and ensure it is closed
Verify stopper seal
Glass stopcock: apply thin vacuum grease if needed
PTFE stopcock: no lubrication needed

Dropping Operation

Mount the funnel on a stand, insert the stem into the reaction vessel
Close the stopcock, add liquid, insert the stopper
Slowly open the stopcock to control dropping rate
Monitor pressure balance in gas-generating setups

Separation Operation

Add liquids, insert the stopper
Shake to mix phases (with venting)
Allow layers to separate, drain the lower layer through the stopcock
Pour the upper layer out through the top

Cleaning & Storage

Clean immediately after use to prevent residue buildup
Use soft brushes and mild detergents; never use abrasive materials
Air dry and store with protective paper between ground joints
For long-term storage, remove the stopcock