Specifications

Cylindrical 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. Cylindrical Separatory Funnel · Configuration Variants

Note: Four configuration variants are available — choose with/without top stopper and with/without bottom stopcock based on your experimental needs.

Variant Type	Top Stopper	Bottom Stopcock	Typical Use
Standard (Full)	✅ With (Glass/PTFE/Plastic)	✅ With (Glass/PTFE)	Regular separation, addition, sealed operations
Open-Top (No Stopper)	❌ Without (Open)	✅ With (Glass/PTFE)	Addition without sealing, quick pouring
Straight-Through (No Stopcock)	✅ With (Glass/PTFE/Plastic)	❌ Without (Straight stem)	Direct liquid transfer, no flow control needed
Simple (No Stopper, No Stopcock)	❌ Without (Open)	❌ Without (Straight stem)	Simple liquid transfer, temporary container

3. Cylindrical Separatory Funnel Sizes

Note: Top stopper and bottom stopcock materials can be freely combined (including "None" option). Capacities range from 10ml to 2000ml.

Capacity (ml)	Joint Size	Stopcock Bore (mm)	Stem O.D. (mm)	Top Stopper	Bottom Stopcock
10	10/19	2	—	Glass/PTFE/Plastic/None	Glass/PTFE/None
25	10/19 or 14/23	2	—	Glass/PTFE/Plastic/None	Glass/PTFE/None
50	14/23 or 19/26	2	—	Glass/PTFE/Plastic/None	Glass/PTFE/None
60	14/15	2	9	Glass/PTFE/Plastic/None	Glass/PTFE/None
100	14/23 or 19/26	2	—	Glass/PTFE/Plastic/None	Glass/PTFE/None
125	14/15	2	9	Glass/PTFE/Plastic/None	Glass/PTFE/None
250	19/26 or 24/29	4	10	Glass/PTFE/Plastic/None	Glass/PTFE/None
500	24/29 or 29/42	4	10	Glass/PTFE/Plastic/None	Glass/PTFE/None
1000	24/29 or 29/42	4	12	Glass/PTFE/Plastic/None	Glass/PTFE/None
2000	24/29 or 29/42	4	—	Glass/PTFE/Plastic/None	Glass/PTFE/None

4. Spherical vs Pear-Shaped vs Cylindrical Comparison

Feature	Spherical	Pear-Shaped	Cylindrical
Body Shape	Spherical	Pear-shaped	Narrow cylindrical
Phase Control	Difficult	Moderate	Easiest
Liquid Capacity	Medium	Medium	Large
Mixing Efficiency	Fast	Standard	Convection mixing
Primary Use	Gas-generating dropping	Extraction	Synthesis addition, large volume
Multi-Neck Flask Fit	Moderate	Moderate	Minimal footprint, ideal

5. 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 (including "None" option).
* 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 cylindrical separatory funnel features a tall, narrow cylindrical body for liquid separation and controlled addition. Compared to pear-shaped or spherical funnels, it offers greater liquid capacity and a more regular shape that facilitates phase separation and control. The thick-wall glass design ensures durability, and the body is marked with clear graduations for accurate volume reading.

Manufactured from high-borosilicate glass 3.3, the product is available in four configuration variants: Standard (with stopper and stopcock, regular sealed operations), Open-Top (without stopper, with stopcock, rapid addition), Straight-Through (with stopper, without stopcock, direct transfer), and Simple (without stopper and stopcock, basic transfer). The top stopper is available in glass, PTFE, or plastic, while the bottom stopcock is available in glass or PTFE. Both top and bottom feature standard taper joints for secure connection to other apparatus. The cylindrical design provides easier phase control during separation and is ideal for liquid addition in multi-neck flask synthesis setups.

✦ Cylindrical Design Advantage: The narrow cylindrical body provides easier phase control during separation compared to pear-shaped funnels, and occupies less surface area on multi-neck flasks — ideal for reflux and stirred synthesis setups.

Key Features

Borosilicate Glass 3.3: Low expansion, high temperature and chemical resistance, high strength, high clarity
Thick-Wall Design: Durable, finely crafted, smooth surface
Narrow Cylindrical Body: Regular interface for easier phase control during separation
Clear Graduations: Precise volume markings for accurate liquid measurement
Four Configuration Variants: Standard, Open-Top, Straight-Through, Simple
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)

Quality Assurance

Each cylindrical 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 cylindrical separatory funnel is particularly suitable for use with multi-neck flasks, occupying minimal surface area. 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

Synthesis Addition

Liquid addition in multi-neck flask synthesis setups — cylindrical design minimizes surface area usage

Reflux Stirring Setups

Ideal for combined reflux and stirring apparatus due to minimal footprint

Large Volume Handling

Suitable for large liquid volumes requiring precise control

Liquid-Liquid Separation

Easier phase control compared to pear-shaped funnels

Precise Addition

Graduated markings allow accurate volume measurement during addition

Compatible Equipment

Standard joint multi-neck flasks, reaction vessels

Ring stands and clamps

Reflux and stirring apparatus

Tip: The narrow cylindrical design minimizes surface area usage on multi-neck flasks, making it ideal for complex synthesis setups with multiple attachments.

Operation & Maintenance

User Guide

Before Use

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

Addition Operation

Mount the funnel on a stand, insert the stem into the multi-neck flask joint
With stopcock: close, add liquid, insert stopper (if present)
Without stopcock (straight): add liquid directly, flow through stem
Slowly open the stopcock (if present) to control addition rate
Read volume from graduations

Separation Operation

Add liquids, insert stopper (if present)
Allow layers to separate (cylindrical shape provides a regular interface)
With stopcock: drain the lower layer through the stopcock
Without stopcock (straight): drain directly, control flow with a clamp
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