What is an Impact Crusher An impact crusher is a machine that uses striking as opposed to pressure to reduce the size of a material. Impact crushers are designated as a primary, secondary, tertiary or quarternary rotor crusher depending on which processing stage the equipment is being utilized. Types of Impact Crushers.Jan 10, 2019 Normally such type of crusher is used for crushing of materials that are not very hard say “soft material” and materials that are non-abrasive. For example limestone, coal, gypsum, seeds etc. Impact crusher description ADVANTAGES OF IMPACT CRUSHER 1. Impact crusher has a blow bar that has very high chrome. 2.