Metso Barmac B Series VSI crushers

By on March 13, 2018

Metso Barmac B Series Vertical Shaft Impactor (VSI) is the original rock-on-rock impactor. It has become synonymous with high-quality products in quarrying and minerals processing industries.


The crushing process makes Barmac VSI unique.

Whereas most other types of crushers use metallic parts to crush rock, Barmac VSI uses the rock fed into the machine to crush itself.

This autogenous crushing action offers the lowest possible cost per ton of any impact crushing method.

The high velocity impact crushing achieved in a Barmac VSI improves the soundness and shape of the material and produces the highest quality end products on the market today.

It is widely known that the more cubical your product, the better its performance in concrete, asphalt and base mixtures.


  • Produces a product of superior cubical shape
  • Ability to control product grading by cascading and tip speed
  • Low wear costs due to unique rock-on-rock crushing
  • Accepts fine material in feed

Rock-on-rock process action

Barmac VSI is usually applied in the last phase of the crushing circuit.

The quarrying and construction industry has always been Barmac VSI’s main application area with thousands of units operating around the world, followed by many demanding manufactured sand, heap leaching, pre-grinding, industrial minerals and recycling applications.

This is possible because of the unique free-impact crushing and grinding action combined with the ability to accept fines in the feed and to fine-tune the crusher’s performance by simply changing the rotor speed or cascade ratio.

 Cascading optimizes quality

The primary path for the feed material is through the stone lined rotor where material can be accelerated up to rotor tip speeds of 80 m/s (262 ft/s) before being discharged into the crushing chamber.

Additionally, material may be cascaded into the crushing chamber, bypassing the rotor.


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