Square mixing nozzles achieve comparable homogeneity in a shorter element stack by generating stronger radial shear and boundary layer disturbance than helical elements, while leaving less retained material inside the nozzle after each shot. For standard non-filled adhesives at moderate viscosity, helical nozzles are a reliable and familiar choice. When nozzle body length, material waste, or abrasion from filled adhesives is a process concern, square mixing nozzles are typically the better fit — confirm element count against your material viscosity before switching.