PTFE-coated paddle stirrers are laboratory tools designed for use with overhead stirrers to mix highly corrosive chemicals or sensitive samples. The Polytetrafluoroethylene (PTFE) coating provides exceptional chemical resistance, a non-stick surface, and high-temperature stability (typically up to +250°C).
Common Types and Designs
- Paddle / Leaf Stirrers: Feature a flat, often rectangular blade suitable for low-to-medium speed mixing of flowable liquids in large vessels.
- Centrifugal (Foldable) Paddles: These paddles stay closed to fit through narrow flask necks and open up once they begin spinning, making them ideal for round-bottom flasks.
- Anchor Stirrers: Shaped like an anchor to sweep the bottom and sides of a vessel, preventing sedimentation and ensuring heat transfer in viscous fluids.
- Propeller Stirrers: Use angled blades to create axial flow (upward or downward), which is efficient for dissolving solids or mixing liquids with different densities.
Representative Products
- Scilogex PTFE Coated Paddle Stirrer: This model features a 300mm long shaft with a 67mm wide impeller, designed for standard laboratory mixing tasks.
- Caframo PTFE Anchor Paddle: Known for high torque applications and chemical resistance, this anchor-style impeller provides stability for benchtop stirring.
- MagiDeal PTFE Coated Stainless Steel Shaft: Offers the structural strength of a stainless steel core with the chemical protection of a PTFE exterior, often featuring foldable paddles for flask compatibility
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