stonylab 7pcs Stir Bar Set, PTFE-Coated Magnetic Stirring Bars White Stir Mixer for Stirrers, Assortment Pack Mixed Sizes 7 Pcs

Description

Product Overview

The StonyLab 7pcs Stir Bar Set is engineered for demanding laboratory environments where precision, durability, and chemical compatibility are paramount. Each bar is encapsulated in a high‑performance PTFE (polytetrafluoroethylene) coating that dramatically reduces friction, allowing the magnetic stirrer to rotate smoothly even in viscous solutions. The set includes seven bars of incremental lengths—10 mm, 15 mm, 20 mm, 25 mm, 30 mm, 35 mm, and 50 mm—providing the flexibility to match vessel size and stirring speed requirements across a broad spectrum of experimental protocols. Product dimensions are compact at 1.97 × 0.35 × 2.2 inches, weighing only 0.56 oz, which makes storage and handling effortless. The model number PTFE‑StirBarSet‑7PK reflects the PTFE coating technology and the seven‑piece assortment, while the manufacturer StonyLab Scientific guarantees consistent quality control. Designed to be autoclave safe, these bars can withstand repeated high‑temperature sterilization cycles without degradation, ensuring long‑term reliability for routine laboratory use.

Usage

These magnetic stir bars excel in a wide array of laboratory applications, from routine solution preparation in chemistry labs to delicate cell culture media agitation in biotech facilities. Their PTFE surface resists most organic solvents, acids, bases, and salts, making them suitable for reactions involving aggressive reagents. The magnetic core provides a strong coupling with standard laboratory magnetic stirrers, delivering consistent vortex formation even at low RPM settings, which is essential for sensitive assays that require gentle mixing. The assortment of bar lengths enables optimal performance in flasks, beakers, and reaction vessels ranging from 50 ml to 2 L, ensuring that the stir bar remains fully submerged and that the magnetic field is efficiently transferred. Users in industrial settings appreciate the bars’ ability to operate under elevated temperatures up to 260 °C, while the abrasion‑resistant PTFE coating protects against mechanical wear during prolonged use. Whether you are conducting organic synthesis, preparing calibration standards, or maintaining homogeneous suspensions in quality‑control labs, this set meets the rigorous demands of modern scientific workflows.

Why Choose Us

StonyLab Scientific has built a reputation for delivering laboratory accessories that combine robust engineering with cost‑effective pricing. The 7‑piece stir bar set stands out because of its comprehensive size range, which eliminates the need to purchase multiple single‑size bars from different suppliers. Each bar undergoes a stringent quality‑assurance process that verifies magnetic strength, PTFE coating uniformity, and dimensional accuracy, ensuring that you receive a product that performs reliably from day one. The PTFE coating not only provides superior chemical resistance but also offers low surface energy, reducing the likelihood of sample adhesion and facilitating easy cleaning. In addition, the set is backed by a one‑year limited manufacturer warranty, reflecting confidence in the material durability and manufacturing standards. Customer support is readily available to address any technical questions, and replacement parts can be supplied promptly, minimizing downtime in critical experiments. By choosing StonyLab, you invest in a product that aligns with the highest standards of laboratory safety, reproducibility, and operational efficiency.

Key Features

• Seven sizes from 10 mm to 50 mm cover most vessel dimensions, reducing the need for multiple purchases.
• PTFE coating delivers exceptional chemical resistance and low friction for smooth stirring in aggressive solutions.
• High temperature tolerance up to 260 °C and autoclave compatibility ensure longevity under harsh sterilization conditions.
• Compact, lightweight design simplifies storage and handling while maintaining strong magnetic coupling.
• 1‑year limited warranty and responsive customer service provide peace of mind and reliable after‑sales support.

FAQ

What solvents are compatible with the PTFE coating?

The PTFE coating is inert to most organic solvents, acids, bases, and salts, including acetone, ethanol, hydrochloric acid, sodium hydroxide, and many others. It is recommended to avoid prolonged exposure to highly oxidative agents such as concentrated nitric acid, which may eventually degrade the coating.

Can the stir bars be used in high‑speed magnetic stirrers?

Yes, the magnetic core is designed to maintain a strong magnetic field even at high RPMs. However, for very high speeds (above 2000 RPM), it is advisable to select the larger 35 mm or 50 mm bars to ensure stability and prevent the bar from being ejected from the solution.

How many autoclave cycles can the bars endure?

The PTFE coating is rated for at least 50 autoclave cycles at 121 °C for 30 minutes each without significant loss of performance. Users have reported successful use beyond this threshold, but periodic inspection is recommended.

Is there a recommended cleaning procedure?

After use, rinse the bars with deionized water and a mild detergent if residues are present. For stubborn contaminants, a brief soak in a compatible solvent (e.g., ethanol) followed by thorough rinsing is effective. Dry the bars before storage to prevent moisture buildup.

What is the warranty coverage?

The one‑year limited warranty covers manufacturing defects in the magnetic core and PTFE coating. It does not cover damage caused by misuse, improper cleaning with abrasive materials, or exposure to incompatible chemicals.