How Magnetic Stirring Works & How We Save You Time & Money

Excedr - Magnetic Stirrer

Excedr’s leasing program can source virtually all instrument types and accommodate any brand preferences you might have. Request a magnetic stirrer lease estimate today and see how leasing can discount your lab equipment’s price.

All equipment brands/models are available

The Advantages of Excedr’s Magnetic Stirrer Leasing Program:

  • Eliminates the upfront cost of purchasing equipment by spreading its cost over time
  • Minimizes equipment downtime with included complete repair coverage and preventive maintenance
  • Takes advantage of potentially 100% tax deductible* payments, providing you significant cash-savings
  • Expedites the administrative work needed for instrument procurement and logistics
  • Conserves working capital,  enabling you to reinvest in your core business and operations (staffing, inventory, marketing/sales, etc.)
  • Accommodates all manufacturer and model preferences

*Please consult your tax advisor to determine the full tax implications of leasing equipment.

a microplate well leaning against a graduated cylinder on top of glassware storage

The magnetic stirrer, also known as a magnetic mixer or a magnetic stir plate, is often found biology and chemistry laboratories working in research and development (R&D).

That said, magnetic stirrers can be used in numerous industries, including biotechnology, microbiology, healthcare, chemical, and food and beverage. It is one of the simplest devices to use to prepare mixtures, but is not generally capable of stirring large volumes of a sample. 

In these cases, mechanical stirring is often required. This is achieved using devices like the overhead stirrer, which can mix, homogenize, suspend, or recirculate large volumes or high-viscosity substances.

Nonetheless, a magnetic mixer is a very dependable piece of laboratory equipment when a smaller quantity of mixing is necessary and the project can easily fit on a small area of your bench space.

In fact, they are often preferred over motorized stir units because they are typically quieter and more efficient. Stirrers are also capable of working inside a sealed vessel or system without having to be isolated. 

Magnetic stirrers do not require external moving parts that typically break down over time and often experience little wear and tear.

Magnetic Mixer Methods, Benefits, & Price

a hand face up balancing a screw on its index finger

There is some variety to the types of magnetic stirrers available. But, most setups consist of a base, stir bar, and a hot plate, which can be made of stainless steel. However, some parts may be made of chemical resistant materials, such as glass or Teflon™.

The stir bar is one such component that benefits from being chemically inert, as it is placed inside of the beaker containing a sample that may include chemicals or other corrosive materials.

Stirrers come in a variety of sizes and are available in single or multi-position configurations. They can operate with or without a motor, and employ the use of magnets to provide continuous, hands-free stirring within laboratory glassware, such as beakers or vials, placed on top of the base. Let’s look at this device’s design and it’s various benefits.

Rotating Magnetic Field

A magnetic stirrer operates using a single rotating magnet or a combination of stationary electromagnets. All magnets are stored below the device.

The magnet or magnets rotate using a motor and an electric current running through them, creating a rotating magnetic field that interacts with the magnetized stir bar placed within the beaker. This magnetic coupling controls the stirring speed of the device, which can be adjusted based on your needs, such as experiment goals or the viscosity of the sample.

As the magnetic field rotates, so does the stir bar, creating a vortex and stirring the contents of any vessel placed on top of the unit’s platform.

In general, stirring speed range varies from 100 to 2400 rpm, along for low and high-speed stirring; however, the device’s stirring capabilities and adjustable speeds mostly depend on manufacturer’s design. As the magnetic field rotates, so does the stir bar, creating a vortex and stirring the contents of any vessel placed on top of the unit’s platform.


Stir Bar

A magnetic stir bar, also known as a flea, is typically made of a small magnet coated in PTFE (Teflon) or plastic. The coating is intended to be chemically inert so as not to react to the mixture the stir bar is immersed in.

This component is not very large, and ranges in size from a few millimeters to a few centimeters. Separately, a stir bar receiver, which is made of a small magnet attached to a long rod, may be used to retrieve the stir bar from inside the vessel.

The limited size of the stirrer bar means magnetic stirrers can only be used for tasks that involve smaller sample sizes, generally around 4 liters or less. The size also makes stirring any highly viscous substances difficult, and in some cases impossible.

Despite these limitations, magnetic bars are easy to clean and sterilize, and do not require any lubrication, which reduces the risk of contamination.


Hot Plate

Magnetic mixers are often coupled with a hot plate to provide a source of heat. In general, the heating plate has a temperature range of 200-250°C, depending on the model, and comes with efficient temperature controls.

Hot plates create heat by running an electrical current through a medium with high electrical resistance, such as a metal coil. The heat provided is safer, gentler, and more controllable than a Bunsen burner.


Single- Or Multi-Position

Depending on the size of your experiment, either a single-position or multi-position magnetic stirrer will be optimal. As a stir bar can only stir so much, you may need multiple flasks to be running simultaneously to maintain efficiency.

In this case, a multi-position magnetic mixer is appropriate to use. These devices allow multiple vessels to be stirred simultaneously, and at different speeds. When dealing with one sample at a time, a single-position stirrer is adequate.


We Offer Magnetic Stir Plate Leases to Fit Every Need

three shapes shown one after another: an erlenmeyer flask, boiling flask, and graduated cylinder

Modern biology, microbiology, and chemistry laboratories are outfitted with an array of automated stirring equipment to ensure quality control and efficiency. These simple designs guarantee ease-of-use and high throughput.

Although acquiring new and refurbished laboratory equipment can be financially burdensome, you can skip the procurement headaches using alternatives like Excedr’s leasing program.

Our program spreads costs out over time and includes preventative repair and maintenance coverage, making it easier to acquire the technology you need without having to pay huge upfront costs.

We offer a wide variety of stirring and separation equipment, and are not limited to just magnetic hot plate stirrers. If you’re interested in procuring overhead stirrers, lab shakers, laboratory centrifuges, or any other type of general purpose stirring or shaking system, we can help. Just let us know what lab equipment you’re interested in leasing.

Operating Lease

This off-balance sheet financing structure provides three options at the end of the term. The lessee has the option to return the equipment to the lessor, renew at a discounted rate, or purchase the instrument for the fair market value. Monthly payments are also 100% tax deductible which yields additional monetary savings.


If you recently bought equipment, Excedr can offer you cash for your device and convert your purchase into a long-term rental. This is called a sale leaseback. If you’ve paid for equipment within the last ninety days, we can help you recoup your investment and allow you to make low monthly payments. This also frees up money in your budget rather than tying it down to a fixed asset.

Magnetic Stirrer Manufacturers & Models on the Market
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ThermoFisher Scientific:
Cimarec+ Stirrer Series, Cimarec i Mini, Cimarec i Micro, Cimarec i Telesystem Multipoint, Cimarec i Compact and Maxi, Cimarec Basic, Mobil 10, Mobil 25, Mobil Direct, SuperNuova+ Stirrer Series, RT Touch Series, Cimarec Biosystem Slow Speed, i Micro

Stuart Digital Round-Top Stirring Hot Plate, Stuart Digital Round-Top Stirrer, Cole-Parmer Stuart Stirring Hot Plate, Magnetic Analog, Cole-Parmer elements Modular

Bio-Rad Laboratories: Digital Hotplate Stirrer
Heidolph Instruments GmbH & Co. KG: Hei-Standard, Hei-Tec, Hei-Connect, Hei-Mix S

IKA Plate, C-MAG HS 7 control, RCT 5 digital, IKA myPlate, RET control-visc, RET control-visc white, RH basic, RH basic white, RH digital, RH digital white, RCT Basic, RET basic, C-MAG HS 4, C-MAG HS 7, C-MAG HS 10, C-MAG HS 4 digital

Benchmark Scientific:
MiniMag, 7×7” Digital, Benchmark Digital Hotplate Magnetic Stirrer, Benchmark Digital Magnetic Stirrer, Benchmark Hotplate Magnetic Stirrer, Benchmark Magnetic Stirrer

PCE Instruments:
PCE-MSR 350, PCE-MSR 400, PCE-MSR 405, Multiposition PCE-MSR 405, Multiposition PCE-MSR 410, Multiposition PCE-MSR 415

Heathrow Scientific:
Magnetic Induction Stirrer, Mini Magnetic Stirrer

BT Lab Systems:
Multi position (4 positions) individually controlled, Magnetic Stirrer Hot Plate, Multi position (8 positions), Digital Display with Timer, Magnetic Stirrer Hot Plate with Timer, Cell Culture Stirrer, Multi position (12 positions)


Operating Capital Benefits

Operating Capital Benefits

Excedr's operating lease structure allows you to keep your business credit line open for expansions, staffing, and other operational expenses. Additionally, it strengthens the cash flow of your business and keeps cash reserves free for business development opportunities.

Effects on Credit

Effects on Credit

Leasing / renting provides you with non-dilutive financing and does not hinder your future borrowing ability. You're able to acquire the equipment you need without the baggage associated with traditional financing.

Speed of Approval

Speed of Approval

Excedr's program allows you to respond quickly as your need for equipment and technology arises. You can be approved with minimal documentation and have the equipment you need in operation and generating revenue for your business quickly.

Refurbished Equipment

Refurbished Equipment

Unlike traditional financing and leasing companies, the Excedr program can accommodate refurbished equipment in addition to demo units. If you are looking for additional cost-savings, we recommend considering this option.