Admix Boston Shearpump, Inline High Volume Mixer for Particle Size Reduction

The Boston Shearpump (BSP) provides high throughput at moderate to high shear rates, surpassing the capabilities of conventional shear pumps and colloid mills. The BSP is ideal for inline mixing of solids or powders into viscous liquids and offers consistent and repeatable shear capability. The BSP is for specific mixing requirements where “texturizing” of viscous products is required, and it meets the toughest hygienic standards including 3-A TPV compliance.

Thus designed to run 24/7, the Boston Shearpump can mix, disperse, emulsify, pulverize, macerate, crush, homogenize, and reduce solid particles at high volumes, and can withstand uneven flow patterns, jolts, and pressure fluctuations.

Wet milling with rotor-stator equipment can provide many advantages. In the food, dairy, beverage, and other industries, particle size reduction is important and the BSP can mill soft particles down to <10 micron, or hard particles down to 10-20 microns in just a single pass at high production rates. It can also be used to precondition product going through a high-pressure homogenizer, improving total product quality while increasing homogenizer capacity and reducing homogenizer maintenance costs.

Admix has helped customers with hundreds of inline mixer installations in place for tomato paste standardization, salad dressing and mayonnaise processing, pet food production, flavor emulsions, pharmaceutical preps, and API blending, polymer blends, and more.

Get a customized mixing solution, learn about our trial program, or have your ingredient tested for free in our pilot lab.


Boston Shearpumps is capable of processing high throughput at very high shear rates producing tight particle size distribution.

Most noteworthy, Boston Shearpumps comes constructed with a multi-slot rotor turning at high speed in close proximity to a multi-port stator. The shear head of the inline mixer comes with a double ring design providing two stages of mixing at both the rotor and stator. This results in three distinct, high-intensity work zones at each rotor/stator location where the mixture passes:

  • Between the first set of rotor slots or teeth and the first ring of slots on the stator
  • Then between the first ring of slots on the stator and the second ring of slots in the rotor
  • Finally between the second ring of slots in both the rotor and stator

As a result, Boston Shearpump models have a single shear head for simple operation, providing 2 mixing stages with 3 work zones to handle a customer’s toughest processing needs.

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