Rave Scientific offer the Pfeiffer ACP 15, 28 and 40 dry compact multi-stage root pumps. The pumping technology is based on a frictionless multi-stage roots design. The benefits of multi-roots dry pumps include oil-free and particulate-free dry vacuum, e.g., unlike their counterparts, the dry scroll pumps which generate tip seal dust and the oil-sealed rotary vane pumps which suffer from hydrocarbon vapor back streaming.