• Primarily used in heat transfer applications for viscous systems when vigorous blending is not required.
• Often fitted with wall scrapers to enhance heat transfer from a jacketed vessel.

• A variation on the Anchor.
• Cross-arms are used to enhance mixing towards the center of the vessel. These may be straight or inclined.
• More effective than an Anchor in highly shear thinning systems where simple anchor arms may tend to "cut a hole" in the batch.

• Used in very viscous systems.
• Blends well even when the viscosity is greater than 1,000,000 cps.
• Especially indicated when the system is highly non-Newtonian and/or viscoelastic.
• Helices provide good heat transfer in jacketed vessels.
• The double ribbon arrangement is preferred to better balance mechanical forces and to provide more circulation than does the single flight arrangement.

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