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Selecting the appropriate stir bar is crucial for successful and efficient laboratory work. The right choice ensures optimal mixing, prevents damage to sensitive equipment, and contributes to reproducible experimental results. This guide will help you navigate the options and find the best lab stirrer for your specific needs.
Package Included：Size: 6.4mm×20mm/0.8 inches. Quantity: 10 pieces, shape: cylinder with pivot ring shape
DURABLE MATERIAL：Stir stick is made of Teflon and high-quality magnet. It is not easily demagnetized and lasts longer than other stir bars
Scientific Design：These stirring sticks have a pivot ring in the center. They are designed to hold an optimal position in containers with curved or uneven bottoms. The ring helps reduce vibration and wear, and reduces the effects of friction from...
Suitable for a variety of stirrers:Magnetic stir bars can be used with various types of magnetic stirrers or heating stirrers on the market
Versatile Magnetic Stir Bar Set: This 8-piece PTFE Magnetic Stir Bar set includes 8 different sizes, providing perfect options for various laboratory applications
Good Quality Material: Polyethylene tetrafluoroethylene (PTFE) magnetic stir bars are made by sealing permanent magnets in PTFE material can withstand high temperatures
Perfect for Laboratory and DIY Use: Ideal for laboratory applications such as chemistry labs, general training, science lab, also a good choice for the home diy handmade project
How to Select: Select the stir bar based on the volume; For volumes up to 1000 mL, a 15 mm stir bar is sufficient. For volumes up to 3000 mL, a 30 mm stir bar should be used; Note: Stir bars are suitable for use with liquids of low viscosity. If used with...
8-PIECE SET, 7 SHAPES: Six PTFE stir bars — 25mm, 30mm, 35mm, 26mm octagonal, 40mm gear-type and 40mm cross — plus a 20mm high-temp glass bar (350°C) and a 180mm retriever stick.
FITS MOST MAGNETIC STIRRERS: Works with common lab stirrers, hot plates and stir plates; pair the 20-30mm bars with small beakers and flasks, the larger 40mm bars with wider vessels.
HIGH-TEMP GLASS BAR INCLUDED: The 20mm glass stir bar handles up to 350°C, for hot-plate stirring where polymer coatings reach their limit.
PTFE COATED FOR DAILY LAB USE: Smooth, inert PTFE spins with low friction and rinses clean between runs; note that strong alkalis may dull the surface over time.
Versatile Magnetic Stir Bar Set: This 8-piece PTFE Magnetic Stir Bar set includes 7 different sizes, providing perfect options for various laboratory applications
Good Quality Material: Polyethylene tetrafluoroethylene (PTFE) magnetic stir bars are made by sealing permanent magnets in PTFE material can withstand high temperatures
Perfect for Laboratory and DIY Use: Ideal for laboratory applications such as chemistry labs, general training, science lab, also a good choice for the home diy handmade project
How to Select: Select the stir bar based on the volume; For volumes up to 1000 mL, a 15 mm stir bar is sufficient. For volumes up to 3000 mL, a 30 mm stir bar should be used; Note: Stir bars are suitable for use with liquids of low viscosity. If used with...
Versatile Magnetic Stir Bar Set: This 8-piece PTFE Magnetic Stir Bar set includes 8 different sizes and recycling rod for stir bar retrieval, providing perfect options for various laboratory applications
Good Quality Material: Polyethylene tetrafluoroethylene (PTFE) magnetic stir bars are made by sealing permanent magnets in PTFE material can withstand high temperatures
Perfect for Laboratory and DIY Use: Ideal for laboratory applications such as chemistry labs, general training, science lab, also a good choice for the home diy handmade project
How to Select: Select the stir bar based on the volume; For volumes up to 1000 mL, a 15 mm stir bar is sufficient. For volumes up to 3000 mL, a 30 mm stir bar should be used; Note: Stir bars are suitable for use with liquids of low viscosity. If used with...
Package Included:Size: 6.4mm×20mm/0.8 inches. Quantity: 20 pieces, Shape: Cylinder with pivot ring
Durable Material:The stirring bar is made of Teflon and high-quality magnets. It is not easy to demagnetize, resistant to high temperature, corrosion, wear, and high rotational force, and has a longer service life than other stirring bars. The surface is...
Scientific Design:These stirring bars have a pivot ring in the center. They are designed to maintain the best position in containers with curved or uneven bottoms. The ring helps reduce vibration and wear, and reduces the friction effect caused by contact...
Suitable for a variety of stirrers:Magnetic stir bars can be used with various types of magnetic stirrers or heating stirrers on the market
Features: magnetic stir bar can resist high temperatures, corrosion, abrasion and high rotational forces, and has the properties of fine workmanship, no impurities and burrs on the surface, stable speed and no deviation
Quality material: PTFE magnetic stirrer is made of PTFE and quality magnetic steel, and the cylindrical shape and smooth surface will reduce friction and improve smooth rotation
More other applications: laboratory bar is widely applied in scientific research, universities, laboratories in the industrial and agricultural sectors, and also can be applied to stir mixed substances
Widely applicable: stir plate magnet bar will work well with various types of magnetic stirrers or heating stirrers
【Non-Stick & Strong】PTFE coating for low friction; powerful magnetic coupling for stable stirring.
【Multiple Sizes & Shapes】Includes cylindrical, gear-type, cross, and glass bars in various dimensions (A9×25mm, B9×30mm, C8×35mm, G8×20mm, H12×26mm, gear 7×40mm, cross 10×40mm) to fit different vessels and mixing needs.
【Heat & Chemical Resistant】PTFE-coated bars resist acids, alkalis, and solvents; glass stir bar withstands up to 350°C for extreme high-temperature reactions.
【Easy Retrieval】Comes with 180mm PTFE retriever stick to quickly pick up stir bars from deep beakers or hot liquids without touching them.
Last update on 2026-10-16 / Affiliate links / Images from Amazon Product Advertising API
How to Choose the Best Lab Stirrer Bars
Comparison Tips
Match the stir bar's magnetic strength to the stirrer's power and the liquid's viscosity.
Ensure the stir bar material is chemically inert to your reagents.
Select a size and shape that fits comfortably within your vessel without touching the sides.
Consider specialized shapes for specific mixing needs, such as egg-shaped for round-bottom flasks.
Look for smooth coatings to prevent sample contamination and vessel damage.
Frequently Asked Questions
What is the most common material for lab stirrer bars?
The most common material is PTFE (Polytetrafluoroethylene), often referred to as Teflon. This material offers excellent chemical resistance and a smooth surface, making it ideal for a wide range of laboratory applications.
How do I determine the correct size stir bar?
A good starting point is to select a stir bar that is about one-third to one-half the length of the inner diameter of your stirring vessel. Ensure it fits without touching the sides.
Can I use a stir bar with any type of flask?
Generally, yes, but the shape of the flask can influence stir bar performance. Round-bottom flasks often work well with cylindrical or egg-shaped bars, while Erlenmeyer flasks can accommodate various shapes.
What is the difference between a PTFE and a stainless steel stir bar?
PTFE bars are chemically inert and non-reactive, making them suitable for corrosive substances. Stainless steel bars have stronger magnetic properties, useful for viscous liquids, but can corrode in certain environments.
How do I clean a stir bar?
Clean stir bars with appropriate solvents based on what you have stirred. For most applications, a rinse with water and mild detergent followed by a thorough rinse and drying is sufficient. Avoid abrasive cleaners that could damage the coating.
What happens if my stir bar is too small or too large?
If a stir bar is too small, it may not adequately mix the solution or could spin erratically. If it's too large, it might not fit properly, could damage the vessel, or cause uneven stirring.
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