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How to choose the right static mixer

Ideal static mixer for your application

A static mixer (also called a motionless mixer or mixing nozzle) is a simple device with no moving parts, and consists of a series of internal elements (baffles) within a plastic housing (tube).

The static mixer is the central, if not the most important, part of the two-component dispensing system.


Theory of Static Mixing

 Elements within the mixer stay “static” i.e. they do not move.

The A & B materials are pushed/pumped/injected into the static mixer in the ratio required. As the two materials move through the series of alternately-angled elements, they are forced to come together and apart, over and over again.

This flow creates layer upon layer of A & B materials. Eventually, the material has been layered so many times, that A & B become a homogeneous stream when they exit the mixer outlet.


Static Mixers optimized for specific fluid types

Material                                                                                                                         Typical # of Elements
Acrylic 8 – 20
Epoxy 15 – 24
Polysulfide 24 – 32
PU Foam 10 – 24
Silicone 20 – 30
Urethane 24 – 36


Viscosity range                                                                                                           Mixing element diameter range
 Thin < 5 000 cps – thinner than syrup  0.093” – 0.25” (2.36 – 6.35mm)
 Middle 5 000 – 50 000 cps – thicker than honey, less than ketchup  0.212” – 0.314” (5.4 – 8mm)
 Thick > 50 000 cps – thicker than ketchup  > 0.366” (9.3mm)


When mixing liquids of two different viscosities, we always choose the mixer based on the component with the higher viscosity


Each type of finish provides specific advantages for specific applications