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  • Cryogenic Storage & Handling
  • Equipment & Devices
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  • Lighting & UV
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  • Molecular Analysis
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    • Overhead Mixer Impellers

    MRC Overhead Stirrer Impellers

    MRC overhead stirrer impellers are available in a wide range of blade geometries and diameters for laboratory blending, dissolving, dispersion, suspension maintenance, heat-transfer support, and viscous-material processing. The selection includes radial-flow turbines and dissolver discs, axial-flow propellers, tangential anchors and gate impellers, and collapsible designs for narrow-neck vessels.

    Choose an impeller according to the vessel size, liquid viscosity, desired circulation pattern, required shear level, and available overhead-stirrer speed and torque. Available diameters range from 15 to 200 mm (0.59 to 7.87 in.), supporting applications from small-volume sample preparation to larger laboratory and pilot-scale batches.

    Impeller Comparison

    Impeller Description Available Diameter(s) Flow Style
    No. 1 Rushton-Type Six-Blade Disc Turbine 50, 65, 75, and 85 mm (1.97, 2.56, 2.95, and 3.35 in.) Radial
    No. 2 Six-Curved-Blade Disc Turbine 50 mm (1.97 in.) Radial
    No. 3 Six-Flat-Blade Disc Turbine 50 mm (1.97 in.) Radial
    No. 4 Six-Blade Open Turbine 50 mm (1.97 in.) Radial
    No. 5 Four-Curved-Blade Open Turbine 50 mm (1.97 in.) Radial
    No. 6 Four-Blade Propeller 30, 70, and 100 mm (1.18, 2.76, and 3.94 in.) Axial
    No. 7 Six-Blade Tapered Open Turbine 50 mm (1.97 in.) Radial-dominant
    No. 8 Three-Blade Propeller 50 mm (1.97 in.) Axial
    No. 9 Formed Three-Blade Propeller 50 and 90 mm (1.97 and 3.54 in.) Axial
    No. 10 Sawtooth Dissolver Disc 15, 25, and 40 mm (0.59, 0.98, and 1.57 in.) Radial / high-shear
    No. 11 Sawtooth Dissolver Disc 50, 80, 100, 120, and 140 mm (1.97, 3.15, 3.94, 4.72, and 5.51 in.) Radial / high-shear
    No. 12 Two-Blade Centrifugal-Opening Impeller 100 mm (3.94 in.) Axial
    No. 13 Three-Blade Propeller 50 mm (1.97 in.) Axial
    No. 14 Four-Blade Propeller 50, 70, and 100 mm (1.97, 2.76, and 3.94 in.) Axial
    No. 15 Three-Blade Broad-Paddle Propeller 80, 100, and 120 mm (3.15, 3.94, and 4.72 in.) Axial
    No. 16 Low-Shear Three-Blade Propeller 80, 100, 120, 160, and 200 mm (3.15, 3.94, 4.72, 6.30, and 7.87 in.) Axial
    No. 17 Two-Blade Pitched Paddle 50 mm (1.97 in.) Axial / mixed
    No. 18 U-Shaped Anchor Impeller 70, 80, and 110 mm (2.76, 3.15, and 4.33 in.) Tangential
    No. 19 Crescent-Shaped Paddle 95 mm (3.74 in.) Tangential-dominant
    No. 20 Perforated Flat-Plate Paddle 70 mm (2.76 in.) Tangential
    No. 21 Three-Blade Turbine-Style Impeller 30 mm (1.18 in.) Axial-dominant / mixed
    No. 23 Four-Blade Collapsible Impeller 140 mm (5.51 in.) deployed diameter Radial-dominant
    No. 24 Perforated Gate Impeller 100 mm (3.94 in.) Tangential-dominant
    No. 25 Four-Blade Cupped Propeller 30 mm (1.18 in.) Axial-dominant

    Flow-style note: Axial-flow impellers primarily move material parallel to the shaft for top-to-bottom circulation. Radial-flow impellers discharge material outward toward the vessel wall and generally provide greater localized shear. Tangential-flow impellers move material around the vessel and are commonly used for gentle, low-speed mixing of more viscous products.

    Selection note: Some flow styles are engineering classifications based on the visible blade geometry where MRC does not publish a formal designation. Confirm vessel size, viscosity, stirrer torque, operating speed, shaft compatibility, and required process performance before selecting an impeller.

    Compare Selected