What Type of Homogeniser (Rotor-Stator) Should We Buy?

Hello!  Would anyone have any advice on how to choose the right rotor and stator to make a super smooth face and body cream?  

We currently have a VMI-brand mixer and it has several options:

4 options for Rotor - 4 blades, 6 blades, toothed, 4 blades+rotor

4 options for Stator - normal slots, narrow slots, wide slots, gridded (like a kitchen shredder)

Thank you!

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Comments

  • chemicalmattchemicalmatt Member, Professional Chemist
    As so often the case, the answer is: it depends.  Only you know the colloidal and rheological properties of your ingredient formulation YQ1, so you will need to determine the sheer-stress allowance.  Just shooting from the hip here (and I am a Silverson guy), if this pup is rolling at 1750 rpm, which is standard, and is a fixed (in-tank not in-line) device, use the 4blade + rotor with the normal slot stator for general use. Keep the stator static, change the rotor to achieve better results, starting with the 6 blade then the toothed, which is useful for chunkier solids like kaolin.
  • BobzchemistBobzchemist Member, PCF student
    If it were me, I would push for getting as many options as you can afford, primarily because every formula and process environment is different.

    I agree with Matt about keeping the stator constant, but you should try as many of the different rotors as you can.

    This is specifically why we, as professional chemists, try to have lab equipment that is as close as possible to the available production equipment. If you had a lab mixer with all of the rotor and stator options, it would only take a week or two to make a batch with every possible combination, and then you'd know for sure which was best. 

    It is also possible that VMI will have some insight about this, or even be able to run some batch trials for you. Have you contacted them?
    Robert Zonis, Sr. Formulation Chemist, Beaumont Products "All opinions and comments expressed are my own, have no relation to Beaumont Products, are fully copyrighted, and may not be used without written permission."
  • Thank you chemicalmatt and bobzchemist for your advice.  We have asked VMI and our suppliers to see if they have any suggestions as well.  will keep you posted on our progress.

    Thank you!
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