Propellors for Overhead Stirrers

1. What’s the difference between a propeller and an impeller for an overhead stirrer?
   In lab mixing, the terms are often used interchangeably. Buyers may also search “mixing paddle.” What matters is the geometry (one-line, centrifugal, paddle, 4-arm) and the material (stainless vs PTFE).

2. Which propeller is best for low-viscosity liquids (water-like solutions)?
   A one-line propeller is a common general-purpose choice for low-to-medium viscosity mixing when you want straightforward circulation.

3. Which option is better for faster blending or dispersion?
   A centrifugal impeller is typically chosen when you want stronger mixing action for blending and dispersion.

4. When should I use a paddle with holes?
   When you want controlled mixing and often less aggressive vortexing than a simple propeller—useful for routine lab blending and many solution prep tasks.

5. What is PTFE (Teflon) used for on mixing propellers?
   PTFE is selected when chemical resistance or product purity is the priority (common in aggressive chemistries or contamination-sensitive workflows).

6. Are these compatible with Benchmark overhead stirrers?
   Yes—these propellers are listed for Benchmark OS-20L and OS-40L overhead stirrers (IPS2050-20 / IPS2050-40).

7. Does the overhead stirrer include a propeller already?
   Benchmark OS-20L and OS-40L stirrers are supplied with a 4-arm stainless steel propeller; the other styles are optional accessories.

8. I’m in Canada—do you ship from Canada?
   Yes. Cambridge Environmental Products is Canadian owned and operates from Ontario (Komoka).