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Advantages Of Using A Laboratory Attritor


Fast and efficient grinding


Scale-up capability


Numerous options


No premixing




Easy operation




Low maintenance


Union Process Research

And Laboratory Attritors

Produce Fine And Homogeneous

Dispersions Quickly And

Repeatedly Under Scientific



From a revolutionary idea proposed and developed by

Dr. Andrew Szegvari in 1945, Attritor technology grew to

become the basis for Union Process, Inc., an independent,

family-owned American company founded in Akron, Ohio.

Today, Attritors are considered to be the most efficient

grinding/dispersing systems and are used in scores of

industries and research laboratories worldwide.

How Attritors Work

The Attritor is often referred to generically as a "stirred ball

mill." The operation of an Attritor is simple and effective. The

material to be ground is placed in a stationary tank with the

grinding media. Carbon steel, stainless steel, chrome steel,

tungsten carbide, and ceramic balls are commonly used

media. The material and media are then agitated by a shaft

with arms, rotating at high speed. This causes the media to

exert both shearing and impact forces on the material. The

final result of this remarkably efficient process is an extremely

fine material, measured in microns or fractions of microns,

distributed on a very narrow curve. The laboratory Attritor

works up to ten times faster than the conventional ball, pebble

or jar mill. Its compact, vertical profile requires minimal space.

No premixing is necessary. Adding ingredients (or taking

samples) can be done at any time during the grinding.

Why A Laboratory Attritor?

Union Process customers know from experience that the

Attritor is one of the most versatile pieces of equipment

in their lab. It can be equipped or retrofitted easily and

inexpensively with a wide variety of components and

accessories. With the Attritor, users can choose wet

or dry grinding, introduce inert atmospheres, operate at

controlled temperatures, vary grinding speed, overcome

product contamination, change media size and type, and

get precise energy consumption information, all on the same

machine. Results are repeatable from one test grind to

another for maximum credibility. Finally, the Attritor is ideal for

formulating, quality control, and scale-up studies.

On Cover:

S1 Attritor equipped with Touch-Screen Controls with

PLC for data acquisition and grind time settings. Also shown is the

shaft seal for grinding under inert gases.

© 2017, Union Process, Inc. All rights reserved.

Common Applications


Agricultural Flowables




Biofuel/Cellulosic Biomass








Chocolate, Confectionery




Cryogenic Grinding


DSM (Mechanical Alloying)


Electronic Ceramics






Food Products


Glass Frits


Industrial Coatings


Metal Oxides


Metal Powders and



Minerals, Coal


Paints, toners, inks


Paper Coatings








Reaction Milling/

Mechanochemical Milling


Tungsten Carbides