Particularly in applications with very viscous media, it is important to have a stirring tool in use that enables the mixing process up to the edges of the vessel. This explains the shape of the anchor-type impeller and the width of the stirring blade of 60 mm. The AR 19 anchor-type impeller is ideal for vessels with the following characteristics: Particularly in applications with very viscous media, it is important to have a stirring tool in use that enables the mixing process up to the edges of the vessel. This explains the shape of the anchor-type impeller and the width of the stirring blade of 60 mm. The AR 19 anchor-type impeller is ideal for vessels with the following characteristics: