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 EL

Horizontal, in-line operation, standard motors, eight sizes, up to 80,000 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 at the same time as mixing them. 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 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 EL

PUC type EL colloid mills are designed for in-line operation. They can be supplied many widely used types of connection (threaded nozzle, flange, tri-clamp, etc.). A special feature of type EL is the bearing block that allows our customers to use their own standard motors (standard B3 motors). At high inlet pressures and viscosity values, the forces generated can be absorbed even more effectively by the separate bearing. Our bearing blocks are fitted only with high-quality bearings with permanent lubrication, made in Germany.


Type EL colloid mills are available in eight standard sizes with capacities between 150 and 80,000 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
  • heated/cooled housing
  • pharmaceutical version
  • ATEX (explosionproof) version
  • version designed for sterilization
  • feed and discharge pump
  • seal unit
  • 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
Production PUC 100 5.5 / 7.5   1510 562 518   2,300 1,500 1,300 700 500
Production PUC 120 7.5   1510 562 518   4,000 3,000 1,800 1,300 1,000
Production PUC 130 11   1510 562 580   6,000 3,500 2,000 1,800 1,300
Production PUC 150 18.5   1514 562 580   12,000 6,500 3,500 2,800 2,300
Production PUC 160 22   1514 562 600   16,000 8,000 4,300 4,000 2,800
Production PUC 180 37   1514 562 669   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
Major production plant PUC 600 55   1750 632 1049   80,000 38,500 30,000 25,000 18,000

*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 EL
Schematic sketch of type EL


A selection of industries which use type EL 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 Metal oxide suspensions
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
Bitumen-emulsions Lubricants Waxes  
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 EL
as of 03/2018, screen-optimized as of 03/2018, screen-optimized
Probst & Class Product Information Colloid Mill Type EL
as of 03/2018, optimized for printing as of 03/2018, optimized for printing