A static mixer, which is sometimes called a motionless mixer, is a simple device with no moving parts.

It consists of internal baffles or elements inside a plastic tube. However, this seemingly elementary device can effectively mix two liquids. As adhesive components are forced through the mixer, they are repeatedly divided and recombined, creating a uniform mixture.

Static mixers are frequently chosen when users encounter too many difficulties with conventional adhesive handling methods—for example when components are scooped into a cup, hand-mixed and transferred to a dispensing container. Using a static mixer provides many benefits, including consistency of mix and elimination of air from the mixture. The latter is an essential precaution. Air can cause voids in cured bond lines that can lead to bonding failure. Overall, process control in hand mixing is difficult to maintain, and this can create serious bonding problems, as well as problems with waste, cost and safety.