Below is a list of Impactor manufacturers from Valparaiso, Indiana. Impactors are a type of size reduction equipment that utilize impaction, which is a collision-wrought force, as opposed to sheer pressure to break apart or deform various materials. Impaction is defined as a force that is transmitted through the striking of one body against another, or a collision, in which crushing occurs as the result of the pressure created by the two opposing forces.