Contact for technical advice

For technical advice please contact our sales team at: 

Phone    +49 (0) 72 22 / 90 79 - 0
Fax        +49 (0) 72 22 / 8 12 74

Colloid mill type O

Vertical, enclosed motor, in-line and batch operation, seven sizes, up to 34,000 l/h


  • de-agglomeration
  • dispersing
  • emulsifying
  • micro-comminution
  • homogenizing
  • dissolving
  • mixing
  • wet milling


PUC colloid mills have a wide range of applications. They can always be used when it is necessary to grind substances precisely and with reproducible results while mixing them at the same time. The milling gear of a colloid mill exerts hydraulic and mechanical cutting, impact, squeezing, friction and shear forces.
The phases are ground and mixed with considerable precision in an annular gap between the two major components, stator and rotor which can be infinitely adjusted by changing the axial position of the stator. Particles are ground extremely finely. Most raw materials, aggregates and agglomerates can be processed in one pass through the mill.

Type O

PUC type O colloid mills have a fully enclosed motor. They are always operated in a vertical position. Materials can be fed to the mill via various different types of hopper adapted to your process or via piping flanged directly to the mill.


Type O colloid mills are available in seven standard sizes with capacities between 150 and 34,000 l/h depending on the machinery configuration and the viscosity of the product. The milling gear can be adapted to your specific process. For this purpose, the mills are fitted with standard stator-rotor combinations. Bespoke solutions are also available for special applications.


All units are available with various single and double-acting mechanical seals and with lip seals (PTFE) in accordance with FDA requirements. The seal is integrated in a seal mount which is identical for all types and sizes of colloid mills. This facilitates the installation of the seal and later replacement with a different seal system, if necessary.


For most PUC mills, a variety of accessories and options are available, including:

  • optional milling gears
  • various material options
  • recirculation system for recirculation of material through the milling gear
  • heated/cooled housing
  • pharmaceutical version
  • ATEX (explosionproof) version
  • version designed for sterilization
  • feed and discharge pump
  • feeder screw with controlled gearbox
  • skid
  • mobile version
  • frequency converter
  • IE3 standard motors for various voltages and frequencies
Application Type Rating (kW) Dimensions Flow-rate l/h max.* (Viscosity in cP)
      Dimensions Length Width Height Flow-rate Low-viscosity ~100 Slightly viscous ~1,000 Viscous ~5,000 Slightly pasty ~50,000 Pasty ~80,000
Laboratory PUC 60 2.2   980 330 1070 (1300)   400 300 250 200 150
Production PUC 100 5.5 / 7.5   400 425 814   2,300 1,500 1,300 700 500
Production PUC 120 7.5   400 425 814   4,000 3,000 1,800 1,300 1,000
Production PUC 130 11   475 500 949   6,000 3,500 2,000 1,800 1,300
Production PUC 150 18.5   475 500 953   12,000 6,500 3,500 2,800 2,300
Production PUC 160 22   475 500 953   16,000 8,000 4,300 4,000 2,800
Production PUC 180 37   510 535 1070   23,000 11,000 6,000 5,500 4,000
Major production plant PUC 220 45   1705 632 1024   34,000 16,500 10,000 9,000 6,500

*With medium milling gap and driver wheel (factor with impeller approx. 2).
The values given above are purely indicative; the actual values depend on the milling gap and the material processed. Our technical department will design the optimum mill for your application.


Zeichnungen Baureihe O
Schematic sketch of type O (left: PUC 60 with recirculation system)


A selection of industries which use type O colloid mills and the products typically handled are listed in the table below. If you cannot find your application in the table, just contact us. Without any obligation, we will provide advice on the optimum machine for processing your product.

Chemical goods
Coating compounds Emulsions Colours and Lacquers Graphite compounds
Resin oils Calcium carbonate suspensions Natural rubber compounds Adhesives
Carbon pastes Plastic compounds Latex emulsions Pesticides, herbicides, fungicides
Pigments Polishing agents Silicone rubber Suspensions
Inks and India inks Clay suspensions    
Creams Shower gels Hair care products Lipsticks
Lotions Mascara Shaving creams Bubble bath
Soaps Shampoos Sunscreen products Toothpaste
Food & beverages
Baby food Sausage meat Cashew paste Cashew milk
Chili paste Peanut butter Rich cream Meat and sausages
Fruit and vegetable juices Cocoa nibs Ketchup Macadamia paste
Macadamia milk Almond milk Almond paste Jams and jellies
Mayonnaise Milk Quark / Curd Concentrated juice
Salad sauces Mustard Sesame paste Soy milk, tofu/bean curd
Waffle dough      
Petrochemical goods
Eye ointments Burn ointments Creams Gels
Healing ointments Suppositories Coating compounds for pills  

Select the screen-optimized PDF to view on your monitor. Select the PDF optimized for printing for better results on common office printers in format A4/letter.

Probst & Class Product Information Colloid Mill Type 0
as of 03/2018, screen-optimized as of 03/2018, screen-optimized
Probst & Class Product Information Colloid Mill Type 0
as of 03/2018, optimized for printing as of 03/2018, optimized for printing