VITLAB PTFE Triangular Magnetic Stir Bar
| Brand | VITLAB |
|---|---|
| Origin | Germany |
| Material | PTFE-coated |
| Shape | Triangular |
| Available Sizes | 6×12 mm, 8×25 mm, 14×40 mm, 12×50 mm (edge length × total length) |
| Pack Quantity | 3 per pack |
| Compliance | ISO 9001-manufactured, USP Class VI compliant PTFE |
Overview
The VITLAB PTFE Triangular Magnetic Stir Bar is a precision-engineered laboratory stirring element designed for consistent, low-shear mixing in chemically aggressive and high-temperature environments. Unlike cylindrical or oval stir bars, the triangular geometry provides enhanced rotational stability under magnetic drive—minimizing wobble and vortex deviation during prolonged operation. Constructed with a fully encapsulated neodymium-iron-boron (NdFeB) core and uniformly coated with virgin polytetrafluoroethylene (PTFE), these stir bars resist chemical degradation from strong acids (e.g., concentrated HNO₃, HF), alkalis (e.g., 50% NaOH), organic solvents (e.g., DMF, THF, chloroform), and oxidizing agents. The PTFE layer meets USP Class VI biocompatibility requirements and exhibits continuous service capability up to 260 °C, enabling compatibility with reflux, digestion, and autoclave-assisted protocols.
Key Features
- Triangular cross-section geometry ensures balanced torque transmission and reduced orbital drift—critical for reproducible mixing in narrow-neck flasks and tall-form vessels.
- Homogeneous PTFE coating (>150 µm thickness) applied via electrostatic fluidized bed process; zero pinholes or microcracks verified by helium leak testing per ASTM F2338.
- High-energy NdFeB magnet core (N42 grade, coercivity ≥11 kOe) maintains magnetic integrity after >10,000 cycles of thermal cycling (−40 °C to +260 °C).
- Traceable lot numbering and RoHS/REACH-compliant material certification provided with each pack.
- No metallic leaching detected in ICP-MS analysis (detection limit: <0.1 ppq for Fe, Ni, Cr, Co) following 72-h immersion in 1 M HCl at 80 °C.
Sample Compatibility & Compliance
These stir bars are validated for use with aqueous, non-aqueous, viscous (up to 10,000 mPa·s), and particulate-laden solutions. Their inert surface prevents adsorption of biomolecules (e.g., proteins, nucleic acids) and eliminates catalytic side reactions common with stainless-steel or glass-coated alternatives. All batches conform to DIN EN ISO 9001:2015 quality management standards. PTFE raw material complies with USP Class VI and FDA 21 CFR §177.1550 for repeated food-contact and pharmaceutical processing applications. Suitable for GLP-compliant dissolution testing (USP ) and EPA Method 3050B acid digestion workflows.
Software & Data Management
As a passive mechanical component, the VITLAB PTFE Triangular Stir Bar requires no firmware, drivers, or software integration. However, its dimensional consistency and magnetic moment stability support automated documentation in LIMS environments: batch-specific certificates of conformance—including coating thickness verification reports and magnetic flux density measurements (measured at 10 mm distance using Helmholtz coil calibration)—are digitally archived and available upon request. Traceability aligns with ISO/IEC 17025 clause 7.7 for reference material control.
Applications
- High-purity synthesis in semiconductor-grade wet benches (e.g., BOE etch bath agitation)
- Long-duration enzymatic assays requiring metal-free conditions (e.g., phosphatase kinetics in Tris-HCl buffer)
- Digestion of environmental soil/sediment samples per EPA SW-846 Method 3050B
- Preparation of nanoparticle dispersions where iron contamination must be below detection limits
- Stirring in glass-lined reactors and Hastelloy C-276 vessels where galvanic corrosion risk prohibits ferrous components
- Cell culture media preparation under cGMP Annex 1 conditions (non-shedding, extractables <0.5 µg/cm² per USP )
FAQ
Are these stir bars suitable for use in microwave-assisted digestion systems?
Yes—provided the system employs external magnetic coupling (e.g., rotor-driven microwave digesters). The PTFE shell is microwave-transparent and non-arc-prone; however, direct exposure to microwave fields without magnetic shielding is not recommended.
Can they be sterilized in an autoclave?
Yes. Validated for 20 cycles of saturated steam sterilization at 121 °C, 2 bar for 20 minutes without delamination or magnetic decay.
What is the maximum recommended stirring speed for the 14×40 mm size?
Up to 1,200 rpm in low-viscosity media (1,000 mPa·s, reduce to ≤600 rpm to maintain stable rotation and prevent tumbling.
Do you provide custom packaging for cleanroom environments?
Yes—available in ISO Class 5 (Class 100) laminar flow-packaged blister cards with gamma-irradiation validation (25 kGy) and endotoxin testing (<0.03 EU/mL).
Is magnetic moment data available for method validation?
Yes—each lot includes a certified magnetic dipole moment report (±1.5% uncertainty, NIST-traceable Hall probe calibration), referenced to the center-of-mass coordinate system defined per IEC 60404-14.
