Giant High Shear Mixer still going strong after 40 years…

Giant Greaves Mixer just keeps mixing – for 40 years


Back in the mid 1970’s when Rod was asking ‘Da ya think i’m sexy?’ and Aston Martin were going through their angular design phase, Imperial Chemical Industries was the world’s largest chemical company.

Involved in every conceivable area of chemical processing from pharmaceuticals and fine chemicals to mineral processing and refinement, ICI was a major player in every sense of the word and when it came to mixing, the company had some big ideas and demanding applications.

In 1975, ICI approached Greaves to design and supply a new high-shear mixer, and what a mixer!

TRPC125ICI.svgICI engineers were looking to scale the principles of high shear mixing to new levels. With over 50 years of mixing experience and unrivalled expertise in the design and manufacture of close-tolerance high-shear mixers, Greaves were a natural choice to help ICI with their requirements

The mixer was the largest we had ever built, in fact, it was the largest high shear mixer in the world.

Not only the largest, but also the most powerful of its type.

ICI required the new mixer to perform an extremely demanding role, homogenising highly abrasive and corrosive mineral slurries. The formulation has continued to prove fantastically successful with spin-off products going into Aerospace, Automotive and Advanced Technology applications.

Still running after 40 years

Even more remarkable, thanks to top quality design and build, coupled with regular, effective maintenance, the original Greaves mixer is still going strong 40 years later!


The High-Shear mixer has some impressive vital statistics:

  • 100 HP (75kW) motor
  • The world’s largest diameter rotor stator
  • High speed – 960rpm
  • Consistent processing of highly abrasive alumina material
  • Estimated in excess of 130,000 tonnes of product over 4 decades


So what’s the secret?

brian 1975IMG_1506At the heart of this success is a commitment to regular planned maintenance and renewal of critical components.

Nothing radical there perhaps but it just shows the real value of looking after your process equipment!


We are always ready to talk….