Let’s Dive into VWR Spinbar Magnetic Stir Bars, Polygon 371220020
The VWR Spinbar Magnetic Stir Bars, Polygon 371220020, manufactured by VWR, might seem like a humble laboratory tool, but their impact on research and development is undeniable. These small, Teflon® resin-coated bars with their unique polygon shape and molded pivot ring, offer a dependable solution for mixing liquids in a variety of scientific settings, from simple solutions to complex chemical reactions. For over a decade, I’ve relied on similar stir bars for everything from mixing epoxy for custom knife handles to creating precise chemical solutions for restoring antique firearms; the right stir bar is essential for achieving consistent results.
My need for these specific stir bars arose when I began experimenting with more viscous liquids in my workshop. Standard cylindrical stir bars often struggled, creating a vortex without thoroughly mixing the entire volume. I was looking for something that would create more turbulence and ensure a homogenous mixture, and the polygon design promised just that.
Upon receiving the VWR Spinbar Magnetic Stir Bars, Polygon 371220020, I was immediately impressed by the smooth, flawless Teflon® coating and the clearly defined polygon shape. The bars felt solid and well-made, reassuring given the low price of $25.49. These felt much sturdier than some cheaper, off-brand options I’ve used in the past, which often have inconsistent coatings that can flake off into the solution.
I considered other options like the cylindrical VWR Spinbar or even specialized high-torque stir bars, but the polygon design seemed the best balance between versatility and mixing power for my needs. My initial excitement stemmed from the potential to streamline my workflow and reduce the time spent manually stirring solutions, a tedious task that often interrupts my creative process. I was eager to see if they could deliver on their promise of enhanced turbulence.
Real-World Testing: Putting VWR Spinbar Magnetic Stir Bars, Polygon 371220020 to the Test
First Use Experience
I first tested the VWR Spinbar Magnetic Stir Bars, Polygon 371220020 in my workshop, using them to mix a thick two-part epoxy resin. This resin is notoriously difficult to mix thoroughly, often resulting in soft spots in the final cured product. The bars were used with a standard laboratory magnetic stirrer.
The polygon shape immediately proved its worth, generating significantly more turbulence compared to the cylindrical bars I had previously used. Even at relatively low speeds, the entire volume of epoxy was thoroughly mixed, leaving no unmixed pockets at the bottom of the container. There were no issues with erratic movements or “chattering,” thanks to the molded pivot ring.
Extended Use & Reliability
After several weeks of consistent use, the VWR Spinbar Magnetic Stir Bars, Polygon 371220020 continue to perform flawlessly. They show no signs of wear or degradation, despite being subjected to various chemicals and abrasive materials. The Teflon® coating remains intact, and the magnetic core retains its strength.
Cleaning is a breeze; the smooth Teflon® surface easily wipes clean with a solvent or soap and water. I’ve used these to mix corrosive agents in some of my firearm restoration projects, and they have held up far better than I expected. Compared to previous experiences with cheaper stir bars that quickly degraded and introduced contaminants into my solutions, the VWR Spinbars have been a significant upgrade.
Breaking Down the Features of VWR Spinbar Magnetic Stir Bars, Polygon 371220020
Specifications
- L x Dia., mm (in.): 20 x 6 (3/4 x 1/4). This size is ideal for smaller containers (50-250ml).
- Material: Teflon® resin-coated with a PTFE molded pivot ring. The Teflon® coating is chemically inert and resistant to high temperatures, ensuring the stir bar won’t react with or contaminate the solution being mixed.
- Shape: Polygon. The multifaceted surface enhances turbulence, facilitating thorough mixing of viscous or dense liquids.
- Pivot Ring: Center molded pivot ring. This design minimizes contact with the vessel, reducing friction, vibration (chattering), and the risk of damaging plastic containers.
These specifications are critical because they directly impact the stir bar’s ability to efficiently mix liquids. The polygon shape is particularly important, as it creates a more chaotic flow pattern than a simple cylindrical bar, leading to better homogenization, especially in difficult-to-mix solutions.
Performance & Functionality
The VWR Spinbar Magnetic Stir Bars, Polygon 371220020 excels at creating a homogenous mixture in a variety of solutions. Its multifaceted design significantly improves mixing efficiency compared to cylindrical bars. It exceeds my expectations in applications involving viscous materials.
A minor weakness might be its size; for larger volumes (500ml or more), a longer stir bar would be more effective. But for the intended purpose of mixing smaller batches of chemicals and epoxies, the VWR Spinbar performs perfectly.
Design & Ergonomics
The build quality is excellent. The Teflon® coating is smooth and uniform. The 20x6mm size feels comfortable and appropriate for the types of containers I typically use in my workshop.
There’s no learning curve involved; it’s a simple and intuitive tool. Just drop it in the liquid and turn on the magnetic stirrer.
Durability & Maintenance
The Teflon® coating is resistant to chemical degradation and physical wear. With proper care (avoiding extremely abrasive materials), these stir bars should last for years. Cleaning is incredibly easy.
Accessories and Customization Options
The VWR Spinbar Magnetic Stir Bars, Polygon 371220020 doesn’t come with any accessories. Being a simple tool, customization isn’t really applicable here. However, the stir bar is compatible with any standard laboratory magnetic stirrer. You may need different sizes for different applications.
Pros and Cons of VWR Spinbar Magnetic Stir Bars, Polygon 371220020
Pros
- Significantly enhances turbulence and mixing efficiency compared to cylindrical stir bars.
- Durable Teflon® coating resists chemical degradation and physical wear.
- Molded pivot ring minimizes friction and prevents chattering.
- Easy to clean and maintain.
- Affordable price point for a high-quality laboratory tool.
Cons
- Smaller size may not be suitable for larger volumes of liquid.
- No included accessories (although accessories are not typically needed for this type of product).
Who Should Buy VWR Spinbar Magnetic Stir Bars, Polygon 371220020?
These stir bars are perfect for:
- Chemists and laboratory technicians who require efficient and reliable mixing of solutions.
- Hobbyists and DIY enthusiasts who work with epoxy resins, paints, or other viscous materials.
- Anyone who needs to mix small batches of liquids thoroughly and consistently.
These might not be the best choice for those primarily working with very large volumes of low-viscosity liquids, as a larger stir bar would be more efficient. It is also not necessary for someone working exclusively with simple solutions. A must-have accessory is a good quality magnetic stirrer with adjustable speed settings to optimize the mixing process.
Conclusion on VWR Spinbar Magnetic Stir Bars, Polygon 371220020
The VWR Spinbar Magnetic Stir Bars, Polygon 371220020 is a simple yet incredibly effective tool that has significantly improved my workflow. The enhanced turbulence created by the polygon shape ensures thorough mixing, and the durable Teflon® coating provides peace of mind knowing that the solution won’t be contaminated. For $25.49, the value proposition is excellent.
I wholeheartedly recommend the VWR Spinbar Magnetic Stir Bars, Polygon 371220020 to anyone in need of a reliable and efficient solution for mixing liquids, especially those working with viscous materials. Upgrade your lab or workshop today and experience the difference!