VWR Standard High Volume Stirrer 25 L 11 x 12.5 in. Large Capacity

VWR Standard High-Volume Magnetic Stirrer (12621-050) – 25 L Large Capacity, 11 x 12.5 in. Top Plate

The VWR 12621-050 is a heavy-duty, high-capacity magnetic stirrer engineered for large-scale laboratory and pilot-plant fluid mixing. With a massive stirring capacity of up to 25 liters, this robust instrument easily handles high-volume chemical preparations, media dissolution, and viscous pilot-scale blending. Its oversized 11 x 12.5-inch cast aluminum top plate provides a stable, corrosion-resistant platform for heavy carboys, flasks, and storage vessels, ensuring smooth, continuous coupling between the drive magnet and the stir bar.

Technical Performance & Design

• High-Volume Magnetic Drive: Equipped with a powerful internal motor and a high-torque drive magnet designed to maintain strong coupling with large magnetic stir bars, preventing spin-outs in solutions up to 25 L.
• Durable Cast Aluminum Top Plate: The **11 x 12.5-inch (279 x 318 mm)** platform features a heavy-duty cast aluminum construction that ensures even weight distribution, structural rigidity, and resistance to impact.
• Continuous Electronic Speed Control: Utilizing a micro-chip velocity dial, the stirrer provides smooth, repeatable speed ramping from low-speed agitation up to high-vortex mixing, minimizing splashing and sample shearing.
• Low-Profile, Rugged Chassis: Built with a low center of gravity to prevent walking or tipping under heavy loads, featuring a cast-metal housing that protects internal electronics from accidental spills.

Product Specifications

• Part Number: 12621-050
• Maximum Stirring Capacity: 25 Liters (approx. 6.6 gallons) H2O
• Speed Range: 60 to 1400 RPM (dependent on fluid viscosity and bar geometry)
• Top Plate Dimensions: 11 x 12.5 inches (279 x 318 mm)
• Plate Material: Cast Aluminum
• Power Requirements: 120V, 50/60Hz, Standard Grounded Laboratory Plug
• Weight Capacity: Rated for up to 50 lbs (22.7 kg) of static top load

Key Benefits & Applications

• Large-Scale Buffer & Media Prep: An essential tool for **bioprocessing and pilot laboratories** where large volumes of cell culture media, buffers, and reagents must be thoroughly homogenized.
• High-Viscosity Mixing Tasks: Ideal for processing dense polymer solutions, chemical slurries, and cosmetics formulations that would stall standard benchtop magnetic stirrers.
• Industrial Carboy Blending: The broad platform effortlessly accommodates **5-gallon Nalgene® or Pyrex® carboys**, allowing for direct, closed-container mixing to prevent ambient contamination.
• Continuous Duty Engineering: Formulated with a cool-running motor design that eliminates heat transfer to the sample platter, protecting thermosensitive biological agents during long-term or overnight runs.

VWR® and its logos are registered trademarks of VWR International, LLC. For optimal high-volume performance, the use of large, specialized magnetic stir bars (e.g., egg-shaped or Alnico-V rare earth bars) is highly recommended.