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.

Pharmaceutical industry
Antimycotics Burn ointments Creams Emulsions
Eye ointments Fungicides Gels Ointments
Skin creams/ointments Suppository coatings Suspensions Tablet coatings
Wound ointments      
Chemical and petrochemical industry
Adhesives Bentonite Binders Bitumen emulsions
Calcium carbonate suspensions Carbon pastes Catalysts Cellulose production
Ceramic compounds Coating materials Detergents Diatomaceous earth suspensions
Fungicides Graphite mixtures Grease Herbicides
Latex emulsions Metal oxide suspensions Pesticides Plastic compounds
Plasticizers Polishing agents Polymer emulsions Polymer electrolytes
Resin oils Rubber compounds Silica Silicone rubber
Stabilizers TiO2 Thickeners Waxes
Foodstuffs industry
Almond milk Baby food Carrot juice Cheese spread
Chick peas Chili paste Dairy products Dressings
Fat Fish Fruit purée Fruit syrup
Herbs Hummus Ice cream Jams
Juice concentrates Juices of all types Ketchup Mayonnaise
Meat Mustard Pastes Peanut butter
Rinds Sauces Sausage meat Sausage processing
Sesame seeds Smoothies Soya Soya milk
Tahina Tofu Waffle crumbs Waffle dough
Cosmetics industry
Creams Foam baths Hair care products Lotions
Make-up Mascara Shampoos Shaving creams
Shower gels Soap Sun blockers Toothpastes

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Probst & Class Product Information Colloid Mill Type EL
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Probst & Class Product Information Colloid Mill Type EL
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