Selected surfaces of a cellular polymeric foam surface finishing pad are heated to cause the surface cells to partially collapse or to fully collapse and glaze over. The selected surfaces may be the planar pad faces or may be formed in one or more depressions formed in the planar faces. The areas of...http://www.google.com/patents/US7906051?utm_source=gb-gplus-sharePatent US7906051 - Foam buffing pad with random or strategically placed collapsed cell structures
