A static mixer is a device for the continuous mix the fluid materials without moving components. Normally the fluids to be mixed are liquid, but static mixers can also be used to mix gas streams, disperse gas into a liquid or blend immiscible liquids. The energy needed to mixing comes from a loss in pressure as fluids flow through the static mixer. One design of a static mixer is the plate-type mixer and another common device type consists of mixer elements container in a cylindrical (tube) or squared housing. Mixer size can vary from about 6mm to 6 meters in diameter. Typical construction materials for static mixer components included stainless steel, polypropylene, Teflon, PVDF, PVC, CPVC and polyacetal.