2" Magnetic Stir Bar

The 2" Magnetic Stir Bar is designed for use with yeast starters and magnetic stir plates in homebrewing and fermentation workflows. Sized for larger Erlenmeyer flasks ranging from 2000 mL to 5000 mL, this stir bar helps maintain continuous liquid agitation during yeast propagation to support oxygen exposure and healthy yeast growth. It is commonly used when preparing large yeast starters for lagers, high-gravity ales, and larger batch fermentations.

Constructed with a smooth PTFE coating, the stir bar is designed for repeated brewing use and easy cleaning. The non-reactive coating helps protect the stir bar surface during contact with starter wort and fermentation liquids while supporting sanitary brewing practices. Its elongated 2-inch design improves circulation and agitation in larger liquid volumes commonly used in advanced yeast starter preparation.

The stir bar is compatible with the Wort Whipper Stir Plate and other standard magnetic stir plate systems used in brewing laboratories and homebrew setups. Continuous stirring helps keep yeast suspended within the starter, improving oxygen distribution and supporting higher yeast cell growth during propagation.

To use, place the sanitized stir bar inside a compatible flask containing starter wort and position the flask on a magnetic stir plate. Adjust stir speed gradually until a stable vortex forms. After use, clean and sanitize thoroughly before storage.

Widely used in homebrewing yeast starter workflows, the 2" Magnetic Stir Bar provides a reusable agitation solution for large-capacity flasks, stir plate fermentation setups, and advanced yeast propagation systems.