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Small-Scale Powder Disperser 3433

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Product Details

The Small-Scale Powder Disperser* 3433 (SSPD) produces small quantities of powder by lifting particles from a turntable using a venturi aspirator. The turntable rotates at variable speeds to control aerosol concentrations. Shear forces created in the SSPD are sufficient to deagglomerate most dry particles in the range from 0.5 to 50 µm.

A selection of optional turntables is available to meet special needs. Because it disperses only a small amount of sample, the SSPD is excellent for studies involving rare, expensive, or hazardous materials. It also effectively disperses polystyrene latex (PSL) spheres used to calibrate measurement instruments. Use it with our Aerodynamic Particle Sizer® (APS™) spectrometer for particle-size-distribution measurements of dry powders.

Features and Benefits

  • Deagglomerates most dry particles in the range from 0.5 to 50 µm
  • Selection of turntables available to meet specific dispersion needs
  • Use as an APS accessory for particle-size-distribution measurements


  • Aerosol generation
  • Powder dispersion

*Developed in cooperation with the University of Minnesota Particle Technology Laboratory.  

  • Are the particles coming out of the SSPD charged?
    Yes. Turbulence in the venturi builds up charges on the particles. The direct straight-line transport to the APS minimizes transport loss however.
  • How do you get aerosol from the outlet on top of the SSPD to the inlet on top of the APS™ spectrometer?
    The APS™ spectrometer can be inverted and set upside down on top of the SSPD. It is recommended that you use a foam pad of about 4 cm thick to raise the APS up so that it will be level. The APS runs perfectly fine upside down. Alternatively a conductive tube can be used to transmit particles from the outlet of the SSPD into the inlet the APS. Some losses of larger particles may occur due to settling and impaction in the bend of a tube.
  • Why can't you use the SSPD for very fine powders smaller than 1 µm?
    Powders that are smaller than 1 µm will not deagglomerate efficiently in the SSPD.

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