Meco air-purged seals effectively contain dry powders and other abrasive materials in crushers, grinders, hammer mills and similar rotating equipment. Seals can increase M.T.B.F. by a factor of four or more over packing and can be quickly rebuilt on site. Seals accommodate significant radial and angular shaft misalignment and shock loads while protecting the shaft and bearings from abrasion damage. Fully split versions permit installation and maintenance without disturbing the bearing or drive assembly. FDA-approved materials are also available.