Description
Product Overview
The Yuyao magnetic stir bar is engineered for high‑performance mixing in demanding laboratory and industrial environments. At its heart lies a high‑strength neodymium (NdFeB) magnet core that delivers exceptional magnetic torque, ensuring reliable coupling with magnetic stir plates even under viscous or high‑speed conditions. The core is fully encapsulated in a seamless 100% pure PTFE (polytetrafluoroethylene) coating, commonly known as Teflon, which provides complete chemical inertness. This coating resists virtually all acids, bases, solvents, and organic reagents, eliminating the risk of contamination and extending the lifespan of the stir bar.
Designed with a low‑profile oval shape, the stir bar measures 3 inches (75 mm) in length and fits comfortably into standard laboratory glassware such as beakers, flasks, and bottles. Its streamlined geometry minimizes turbulence while promoting uniform mixing, and the smooth surface reduces drag, allowing for silent operation at high rotational speeds. The product dimensions are 3.9 × 2.76 × 0.71 inches, weighing only 2.26 ounces, making it easy to handle and store. Model number 7001, manufactured by Yuyao Haiju, meets rigorous quality standards and is listed under ASIN B09JPFXXR2. The stir bar is autoclavable up to 121 °C (250 °F), enabling repeated sterilization cycles without degradation of magnetic strength or coating integrity.
![[Product front view showing all components]](https://www.uelvora.store/wp-content/uploads/2026/07/af684da493494e158bc2fb4ba7ee6ff5.jpg)
Usage
In a typical chemistry laboratory, the Yuyao magnetic stir bar is employed to achieve homogeneous solutions in a variety of vessels, ranging from small 10 mL reaction tubes to large 2‑liter flasks. Its robust magnetic coupling allows it to maintain consistent stirring even when the solution viscosity increases due to polymerization or precipitation processes. Researchers in pharmaceutical formulation benefit from the bar’s chemical resistance, as it can be used with aggressive solvents such as dichloromethane, acetonitrile, and strong acids without compromising the PTFE layer.
Beyond academic labs, the stir bar is well suited for industrial applications, including process development, quality control, and pilot‑scale production. Its autoclavable nature ensures compliance with sterile manufacturing protocols, making it a reliable tool for microbiology, cell culture, and aseptic processing. The oval design also reduces the likelihood of the bar becoming trapped in narrow necks, facilitating easy removal after mixing. Whether used in a temperature‑controlled water bath, a reflux setup, or a simple magnetic stir plate, the Yuyao stir bar delivers smooth, wobble‑free rotation that enhances reproducibility and efficiency across a broad spectrum of scientific and engineering tasks.
Why Choose Us
Choosing the Yuyao magnetic stir bar means selecting a product backed by decades of expertise in precision laboratory instrumentation. Yuyao Haiju adheres to strict quality control procedures, performing magnetic strength testing, coating adhesion verification, and dimensional tolerance checks on every batch. This commitment to consistency ensures that each stir bar meets the exact specifications required for high‑precision experiments, reducing variability and improving data reliability.
Our manufacturing process incorporates advanced sintering techniques for the neodymium core, guaranteeing maximum magnetic flux density while maintaining thermal stability. The PTFE coating is applied in a controlled environment to achieve a uniform thickness that prevents micro‑cracks and enhances durability under repeated autoclave cycles. Additionally, we provide comprehensive after‑sales support, including technical assistance, replacement policies for defective units, and guidance on optimal usage practices. By partnering with Yuyao, laboratories gain access to a trusted supplier that prioritizes product performance, safety, and customer satisfaction.
Key Features
- High‑strength neodymium core delivers maximum torque for reliable stirring even in viscous solutions.
- 100% pure PTFE Teflon coating provides complete chemical resistance, preventing contamination of sensitive samples.
- Autoclavable up to 121 °C, allowing repeated sterilization without loss of magnetic performance.
- Low‑profile oval design minimizes turbulence and fits easily into a wide range of laboratory glassware.
- Dedicated customer support and warranty ensure confidence and assistance throughout the product lifecycle.
FAQ
What size stir bar should I choose for my beaker?
The appropriate size depends on the diameter of the vessel and the volume of liquid being mixed. For standard 250 mL to 500 mL beakers, a 3‑inch (75 mm) oval bar provides optimal coverage and stability. Smaller 0.6‑inch bars are suitable for narrow tubes, while larger 5‑inch bars work well in larger flasks or reactors.
Can the PTFE coating withstand strong acids like hydrochloric acid?
Yes. PTFE is highly resistant to most acids, including concentrated hydrochloric, sulfuric, and nitric acids. The coating creates a barrier that prevents chemical interaction with the neodymium core, ensuring the stir bar remains chemically inert and does not leach contaminants into the solution.
Is the stir bar compatible with all magnetic stir plates?
The Yuyao stir bar is designed to work with standard laboratory magnetic stir plates that use a rotating magnetic field. Its strong neodymium core ensures stable coupling across a wide range of plate speeds. However, extremely high‑speed plates may generate excessive heat; in such cases, monitor temperature and consider using a lower speed setting.
How many autoclave cycles can the stir bar endure?
Our testing indicates that the stir bar can safely endure at least 50 autoclave cycles at 121 °C without any measurable loss of magnetic strength or coating integrity. For best results, allow the bar to cool gradually after each cycle and avoid rapid temperature changes that could induce thermal shock.
What warranty or support is offered?
Yuyao provides a one‑year limited warranty covering manufacturing defects. If a defect is identified, contact our technical support team for a replacement. We also offer guidance on proper cleaning, sterilization, and storage to maximize the lifespan of the stir bar.
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