PTFE Micro Magnetic Stir Bars, 7 mm to 13 mm, 10/Pack
The Globe Scientific PTFE Micro Magnetic Stir Bars deliver reliable, low-volume mixing in scintillation vials, microcentrifuge tubes, and small beakers. Their PTFE-encapsulated bodies resist chemical attack and won't contaminate sensitive reactions, making them suited to reagent preparation, titrations, and dissolution studies on standard magnetic stirrers and hotplate stirrers.
Technical Specifications
| Product Type | Micro magnetic stir bar |
| Volume/Size | 7 mm to 13 mm length; 2 mm to 3 mm OD |
| Material | PTFE-encapsulated magnetic core |
| Closure/Cap | N/A (sealed encapsulation) |
| Sterility | Non-sterile; autoclavable |
| Pack Size | 10 per pack |
Available Sizes
| 7 mm (7 mm L x 2 mm OD) — Bag of 2 | SWN950 | $10.90 |
| 10 mm (10 mm L x 3 mm OD) — Bag of 2 | SWN954 | $10.70 |
| 13 mm (13 mm L x 3 mm OD) — Bag of 2 | SWN956 | $12.10 |
Applications
- Mixing reagents in scintillation and HPLC vials
- Small-volume buffer and standard preparation
- Dissolution and solubility testing in microvolumes
- Titration sample agitation on magnetic stirrers
- Cell culture media component blending
- Reaction stirring in narrow-bore tubes and microwells
Quality & Procurement
Globe Scientific stir bars ship from US inventory through labsupplies.com, an authorized dealer. Packs carry lot numbers that support traceability for CAP-, CLIA-, and ISO 15189-accredited laboratories. Institutional and grant-funded tiered pricing is available — contact us for volume quotes on consolidated orders.
Frequently Asked Questions
Are these PTFE stir bars autoclavable?
Yes. The PTFE encapsulation withstands standard steam autoclave cycles, allowing repeated sterilization between uses without degrading the magnetic core or surface finish.
Which size fits a standard 20 mL scintillation vial?
The 7 mm (2 mm OD) and 10 mm (3 mm OD) bars suit narrow vials and small tubes, while the 13 mm bar works well in 20 mL vials and small beakers where a longer sweep improves vortex formation.
Will PTFE react with my reagents?
PTFE is chemically inert to the vast majority of laboratory reagents, so these bars introduce no contamination into sensitive reactions or trace-level analyses.
How are these stir bars sold?
Each SKU is sold per pack of 10 bars in a single size. The listed prices are per-pack list prices; mix sizes across SKUs to cover varied vessel volumes.