Weewooday PTFE Magnetic Stir Bars 30 mm Pack of 800 — Chemical‑Resistant Cylindrical Lab Stir Bars

Weewooday 30 mm PTFE magnetic stir bars are cylindrical, chemical-resistant stirrers designed to pair with magnetic stir plates for efficient mixing in laboratory settings.

This pack contains 800 identical 30 mm (1.18 in) PTFE-coated magnetic stir bars made with a quality magnetic steel core. Each bar combines a smooth, cylindrical PTFE exterior and a strong magnetic core for steady rotation on a variety of magnetic or heating stirrers. The white PTFE finish resists most chemicals, reduces friction, and minimizes contamination and wear so you can rely on consistent performance during routine mixing and heating tasks.

How will these stir bars perform on a busy lab stir plate?

These 30 mm bars are sized to deliver consistent vortexing in small-to-medium vessels while remaining stable under typical rotational speeds. PTFE's low-friction surface helps the bar spin smoothly, and the magnetic steel core maintains coupling with the stir plate even during vigorous stirring.

• 30 mm length for good vortex formation in beakers and flasks.
• Cylindrical design reduces wobble and improves speed stability.
• PTFE coating minimizes contamination and resists chemical attack.
• Durable magnetic core retains strong attraction over repeated use.

What chemicals and temperatures can these PTFE-coated bars handle?

The PTFE exterior is widely resistant to acids, bases, and most organic solvents encountered in general laboratory work. While PTFE endures many chemical environments, users should avoid exposing the bars to conditions outside PTFE or magnetic steel limits, such as extreme temperatures beyond typical heating-stirrer ranges.

• PTFE resists corrosion from common lab reagents and solvents.
• Suitable for standard heating-stirrer applications—check equipment temperature limits.
• Not recommended for prolonged exposure to strong oxidizers at extreme heat.
• Inspect for wear or coating damage before use in aggressive chemistries.

How easy is it to use and maintain these magnetic stir bars?

Operation is straightforward: place a bar in your vessel, set the vessel on the stir plate, and start the stirrer. PTFE surfaces are easy to clean and chemically inert, simplifying maintenance; however, routine inspection for chips or magnetic weakening is recommended to prevent contamination or performance loss.

• Drop into beakers, cylinders, or flasks and let the stir plate engage the magnetic core.
• Cleans easily with solvents or detergent; avoid abrasive scrubbing to protect the PTFE.
• Inspect for burrs or coating defects before critical experiments.
• Store dry and separated to prevent scratching and magnetic clustering.

Which vessels and applications suit a 30 mm stir bar?

A 30 mm bar works best in vessels from small beakers up to medium flasks and graduated cylinders where it can develop an effective vortex without hitting vessel walls. It's commonly used for sample mixing, reagent dissolution, and routine laboratory workflows across academia, research, and light industrial labs.

• Ideal for 50–500 mL beakers and similar-volume flasks.
• Useful for dissolving solids, mixing reagents, and gentle emulsions.
• Compatible with most bench-top magnetic and heating stirrers.
• Pack of 800 supports high-throughput or multi-station needs.

Who is this for: Teams and individuals running labs, classrooms, or pilot-scale work that require reliable, economical stirring accessories. This large 800-piece kit suits institutions that need replacement bars for multiple stations, teaching labs stocking consumables, or research groups managing frequent turnover. Choose these PTFE-coated bars when you want corrosion-resistant, low-friction stirring tools that pair with standard magnetic and heating stir plates.