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Separatory funnels are essential tools in chemistry labs for liquid-liquid extraction and separation. Their design allows for the efficient separation of immiscible liquids based on density differences. Selecting the appropriate separatory funnel ensures accurate results and safe laboratory practices.
Heavy Casting Iron Base with Standard Support Rod: the weight is 2.5Lb/1150G, twice the weight of stamped bases in indentical size, ensures stable and safe use with a 2000mL separatory funnel; powder coating provides excellent corrosion resistance and...
Standard 60cm Height: 60cm/24" height is standard size for common laboratory support stands; Two-section, each segment measuring 30cm, easy to store and transport.
Custom PP Separatory Funnel Holder: The tapered design securely cradles the funnel against wobble, unlike standard narrow metal rings; Side slot allows easy insertion and safeguards the funnel tip; PP material avoids glass scratches casued by metal...
The sets includes: 1. 1000ml borosilicate glass separatory funnlel with PTFE stopcock and PP stopper; 2. Casting iron base with two-section 60cm support rod; 3. Custom PP separatory funnel holder; 4. Large and small size steel retort ring with bosshead...
Comprehensive Separatory Funnel Kit: our kit includes a 1000ml conical separating funnel and a metal distillation support rack; This combination provides the essential apparatus for liquid-liquid extraction, such as separating water and oil
Conical Funnel: the conical funnel is made of robust borosilicate glass with a 1000ml capacity; It features a standard 24/29 conical joint and a PTFE stopcock; The conical shape promotes efficient separation of liquid layers during extraction procedures
Metal Distillation Stand: this set includes a sturdy metal stand with 3 adjustable clamps; These clamps can securely hold the separatory funnel as well as flasks or beakers of different diameters; The base offers stable placement with anti-slip...
Efficient Extraction: the fully transparent borosilicate glass allows for easy observation of liquid stratification during separation; The large 1000ml capacity helps reduce the number of extraction cycles needed; The apparatus is straightforward to clean...
SEPARATIONS || 500mL Separatory Funnel for separating two immiscible liquids such as water and oil, or for "washing" compounds or mixtures with solvents to remove impurities. Funnel measures approximately 13" tall, and 4" in diameter (at widest point...
INDUSTRIAL QUALITY POLYPROPYLENE PLASTIC || Made of premium-quality polypropylene plastic, with superior optical clarity, chemical durability, and heat tolerance. Can withstand temperatures up to 135°C. Autoclave, microwave and dishwasher safe. Excellent...
PRECISE DISPENSING CONTROL || Features a polypropylene key stopcock fitted with a self-lubricating PTFE plug push-fitted to the stem of the funnel for easy and precise flow control during separation procedures
LEAK PROOF CAP || Includes a leak-proof threaded screw cap for protecting contents
Last update on 2026-10-22 / Affiliate links / Images from Amazon Product Advertising API
How to Choose the Best Lab Separatory Funnels
Types of Separatory Funnels
There are several common types of separatory funnels, each suited for different applications.
Bulb Separatory Funnels: These have a bulbous bottom and are ideal for general-purpose separation where precise control isn't paramount.
Cylindrical Separatory Funnels: Featuring a straight, cylindrical body, these offer better drainage and are suitable for more routine extractions.
Pressure-Rated Separatory Funnels: Designed to withstand elevated pressures, these are used in specific applications like reactions under pressure or when dealing with volatile solvents.
Pressure-Equalizing Separatory Funnels: These have two pressure-equalizing side arms to maintain atmospheric pressure within the funnel, crucial for preventing pressure buildup during extractions.
Material Considerations
The material of the separatory funnel impacts its chemical resistance, durability, and visibility.
Glass: Borosilicate glass is the most common material, offering excellent chemical resistance and clarity. It's suitable for most organic and inorganic solvents.
Plastic: PTFE (Polytetrafluoroethylene) or polypropylene funnels are highly resistant to strong acids and bases, making them ideal for corrosive applications. However, they may have lower clarity than glass.
Size and Capacity
Separatory funnels come in various sizes, typically ranging from 50 mL to 2000 mL or more. The capacity you choose should align with the volume of liquids you typically process. Smaller funnels are convenient for microscale work, while larger ones are necessary for bulk extractions. It's often beneficial to have a few different sizes on hand for versatility.
Stopcock Type
The stopcock is the valve at the bottom of the funnel that controls the flow of liquid.
Glass Stopcocks: Traditional and common, they offer good chemical resistance but require lubrication with grease to prevent sticking and ensure a tight seal.
PTFE Stopcocks: These are self-lubricating, chemically inert, and provide a drip-free seal. They are often preferred for their ease of use and maintenance, especially when working with reactive substances.
Comparison Tips
When comparing separatory funnels, consider the specific chemicals you will be working with to ensure material compatibility. Evaluate the required precision for your separations; pressure-rated or pressure-equalizing models may be necessary for certain experiments. Check the ease of cleaning and maintenance, particularly regarding the stopcock type. The intended scale of your work will dictate the appropriate size.
Frequently Asked Questions
What is a separatory funnel used for?
A separatory funnel is a piece of laboratory glassware used in liquid-liquid extractions to separate immiscible liquids. It relies on the density difference between the two liquids to allow them to settle into distinct layers.
What are the common materials for separatory funnels?
The most common materials are borosilicate glass for general use and PTFE (Teflon) or polypropylene for applications involving strong acids, bases, or corrosive substances. Glass offers better visibility, while plastic provides superior chemical resistance.
How do I choose the right size separatory funnel?
The size, or capacity, of the separatory funnel should be chosen based on the volume of liquids you typically need to separate. It's advisable to select a funnel that can accommodate at least twice the volume of the largest layer you anticipate working with.
What is the difference between a glass stopcock and a PTFE stopcock?
Glass stopcocks require lubrication with stopcock grease to ensure smooth operation and prevent leaks, but can seize if not maintained. PTFE stopcocks are self-lubricating, highly chemical resistant, and typically provide a drip-free seal with less maintenance.
Are pressure-rated separatory funnels necessary for standard lab work?
Pressure-rated separatory funnels are typically not needed for standard laboratory extractions conducted at atmospheric pressure. They are used in specialized applications where reactions are performed under elevated pressure or when volatile solvents could generate significant vapor pressure.
How should I clean a separatory funnel?
Cleanliness is crucial for accurate separations. Wash the funnel with appropriate laboratory detergent and rinse thoroughly with distilled or deionized water. Ensure the stopcock is clean and properly lubricated if it's a glass type.
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