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Sanitary Micronizer®


The Sanitary Micronizer® by Sturtevant (SDM) is the first jet mill listed by the USDA for the sanitary design and fabrication of milling equipment.

The Sanitary Micronizer’s Open Manifold Design allows complete access to the internal material grinding chamber and compressed air chamber for easy cleaning, product changeover or inspection. The SDM has no moving parts, no jet nozzles and has quick release clamps for easy dis-assembly by hand without tools.

The Sanitary Micronizer utilizes a unique fluid energy grinding system to generate particle-on-particle impact. Designed for high performance which surpasses the economical fineness limit of many mechanical grinders — the Micronizer® can consistently produce particles as small as 0.5 microns without heat buildup or contamination.

Learn more about the Sanitary Micronizer® by clicking on the links below. If you have any questions, please contact us.


Models & Specs
Mill Size/Diameter Energy Requirements Compressed
Air/Gas SCFM
bHP Capacity Lbs./hr KG/HR
Qualification 8 2 1/8 – 1 .05 – .5
2″ 20 5 1/2 – 2 .2 – .9
4″ 55 13 2 – 40 .9 – 18
8″ 130 31 10 – 100 4 – 45
12″ 260 62 30 – 250 13 – 113
15″ 350 83 50 – 300 22 – 136
Features & Benefits
  • Documentation to support FDA validation
  • Sanitary design requires no tools – disassembles by hand
  • Accessibility to all internal areas for easy washing, autoclaving or swabbing
  • Consistent control adjustments for continuity
  • Fluid filled gauges pre-calibrated for easier validation


  • 316 Stainless Steel
  • Wear Resistant Liners
  • Alumina Oxide

micronizer-illustrationWatch the illustrated demonstration of how our product works by clicking the image to the right.

What is the typical particle size that can be achieved with a Micronizer®?

The Micronizer® will usually generate particle size distributions ranging from 0.25 Microns to 10 Microns, depending on the incoming feed size, the friability of the material and the feed rate.

The Micronizer® does not generate any heat during milling. The operational temperature of the Micronizer® is controlled by the temperature of the compressed gas entering the mill.

Will the Micronizer® contaminate my powder?

The Micronizer® offers one of the best ways to reduce a powder with very little risk of contamination. The mill uses particle on particle impact to reduce a powder, incidental contact will occur with the mills body. To further protect a powder from contamination Micronizers can be lined with Stainless Steel, Alumina Ceramic, Tungsten Carbide etc.

Can a Micronizer® break down my polymeric powder?

If the polymer is friable (brittle) the Micronizer® can successfully reduce it, if the material is not brittle the particles will bounce off of each other and will eventually be discharged from the chamber without reduction.

The Micronizer® can intensely blend dry powders to create a uniform product. Results are dependent on the ingredient characteristics.

Can a cyclone be substituted for the filter bags to collect my product?

This depends on the final particle size of the product and the type of cyclone being considered. Coarser product can be collected in a cyclone and the exhaust air can be sent to a central dust collector. Fine products will require a secondary filter to insure all of the product is collected.

What is the shape of Micronized particles?

The shape of Micronized particles is usually spherical. The particle on particle grinding method tends to first fracture any irregular portions.

Can Micronizers be used with other gases than compressed air?

Yes, Micronizers can be used with any type of gas, as long as it is at high pressure. Examples are Nitrogen, Argon and Superheated Steam.

Does a Micronizer classify particles?

Yes, a Micronizer® classifies particles as they are being milled, but not with a mechanical device. The Centrifugal Force in the milling chamber retains large particles on the outer diameter for further milling, while the Centripetal Force created by the vortex draws out smaller milled particles for collection. The Vortex Finder controls the size of the particles that can escape before they are fully milled.

How is the particle size of a Micronized powder controlled?

There are several ways to control the particle size of Micronized products. The feed rate varies the retention time in the mill chamber. The grind pressure varies the particle on particle impact velocity. The position of the vortex finder varies the size of the particles that can escape before they are fully milled.


Sturtevant is more than an equipment manufacturer, we stand behind every product we sell. Not only do we strive to provide the best product for each and every application, but we also test, evaluate and maintain our products to assure our clients’ needs.

Sturtevant offers a variety of services to assist with the development, maintenance and testing of products.

  • Lab Sample Testing
  • Field Services
  • Reconditioning
  • Replacement Parts